diff --git a/.github/workflows/continuous-integration.yml b/.github/workflows/continuous-integration.yml
index 2802578642f4..ebe33e60a1a9 100644
--- a/.github/workflows/continuous-integration.yml
+++ b/.github/workflows/continuous-integration.yml
@@ -96,24 +96,6 @@ jobs:
         if: "matrix.dependencies == 'locked'"
         run: "composer install ${{ env.COMPOSER_FLAGS }}"
 
-      - name: "Require latest PHPUnitBridge for PHP 8.x"
-        if: "startsWith(matrix.php-version, '8.')"
-        # using ~ here to avoid issues with windows CLI removing the ^
-        run: 'composer require --no-update --dev "symfony/phpunit-bridge:~5.2"'
-
-      # temporary fix until phpunit-bridge has a release supporting 8.1
-      - name: "Require latest dev PHPUnitBridge for PHP 8.1"
-        if: "matrix.experimental"
-        # using ~ here to avoid issues with windows CLI removing the ^
-        run: 'composer require --no-update --dev "symfony/phpunit-bridge:~5.4@dev"'
-
-      - name: "Set ignored deprecations for php 8.1+ on lowest or locked deps"
-        if: "matrix.php-version >= '8.1' && !contains(matrix.dependencies, 'highest')"
-        run: "echo \"SYMFONY_DEPRECATIONS_HELPER=baselineFile=./tests/deprecations-8.1.json&max[direct]=0\" >> $GITHUB_ENV"
-
-      - name: "Update dev requirements to latest available for the current PHP even on locked builds as they are not bundled dependencies"
-        run: "composer update ${{ env.COMPOSER_FLAGS }} symfony/phpunit-bridge phpspec/prophecy phpdocumentor/* sebastian/* doctrine/instantiator"
-
       - name: "Run install again using composer binary from source"
         run: "bin/composer install ${{ env.COMPOSER_FLAGS }}"
 
@@ -125,11 +107,11 @@ jobs:
 
       - name: "Run tests"
         if: "matrix.php-version != '7.3'"
-        run: "vendor/bin/simple-phpunit --verbose"
+        run: "SYMFONY_PHPUNIT_VERSION=8.5 vendor/bin/simple-phpunit --verbose"
 
       - name: "Run complete test suite on 7.3"
         if: "matrix.php-version == '7.3'"
-        run: "vendor/bin/simple-phpunit --configuration tests/complete.phpunit.xml"
+        run: "SYMFONY_PHPUNIT_VERSION=8.5 vendor/bin/simple-phpunit --configuration tests/complete.phpunit.xml"
 
   validation:
     name: "Composer validation"
diff --git a/.github/workflows/phpstan.yml b/.github/workflows/phpstan.yml
index 40877dc5a9eb..cc40f016354d 100644
--- a/.github/workflows/phpstan.yml
+++ b/.github/workflows/phpstan.yml
@@ -49,9 +49,5 @@ jobs:
       - name: "Install highest dependencies from composer.json using composer binary provided by system"
         run: "composer config platform --unset && composer update ${{ env.COMPOSER_FLAGS }}"
 
-      - name: "Install PHPStan"
-        # Locked to phpunit 7.5 here as newer ones have void return types which break inheritance
-        run: "bin/composer require --dev phpstan/phpstan:^1.0 phpstan/phpstan-phpunit:^1.0 phpstan/phpstan-deprecation-rules:^1 phpstan/phpstan-strict-rules:^1 phpunit/phpunit:^7.5.20 --with-all-dependencies ${{ env.COMPOSER_FLAGS }}"
-
       - name: "Run PHPStan"
-        run: "vendor/bin/phpstan analyse --configuration=phpstan/config.neon"
+        run: "composer phpstan"
diff --git a/composer.json b/composer.json
index 6e32d992fe57..8f3ecc6ee412 100644
--- a/composer.json
+++ b/composer.json
@@ -41,7 +41,12 @@
     },
     "require-dev": {
         "symfony/phpunit-bridge": "^5.4 || ^6.0",
-        "phpspec/prophecy": "^1.10"
+        "phpspec/prophecy": "^1.10",
+        "phpstan/phpstan": "^1.0",
+        "phpstan/phpstan-phpunit": "^1.0",
+        "phpstan/phpstan-deprecation-rules": "^1",
+        "phpstan/phpstan-strict-rules": "^1",
+        "phpunit/phpunit": "^8.5"
     },
     "suggest": {
         "ext-openssl": "Enabling the openssl extension allows you to access https URLs for repositories and packages",
@@ -79,12 +84,9 @@
     ],
     "scripts": {
         "compile": "@php -dphar.readonly=0 bin/compile",
-        "test": "@php simple-phpunit",
-        "phpstan-setup": [
-            "@composer config platform --unset",
-            "@composer update",
-            "@composer require --dev phpstan/phpstan:^1.0 phpstan/phpstan-phpunit:^1.0 phpstan/phpstan-deprecation-rules:^1 phpstan/phpstan-strict-rules:^1 phpunit/phpunit:^7.5.20 --with-all-dependencies",
-            "git checkout composer.json composer.lock"
+        "test": [
+            "@putenv SYMFONY_PHPUNIT_VERSION=8.5",
+            "@php simple-phpunit"
         ],
         "phpstan": "@php vendor/bin/phpstan analyse --configuration=phpstan/config.neon"
     },
diff --git a/composer.lock b/composer.lock
index 9af4801bddb1..3b94b9783dae 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "807062e35c004cd0bb6dafb7ce9d0cd3",
+    "content-hash": "b75018840aa186f02f947abb15a39369",
     "packages": [
         {
             "name": "composer/ca-bundle",
@@ -1859,6 +1859,172 @@
             ],
             "time": "2020-11-10T18:47:58+00:00"
         },
+        {
+            "name": "myclabs/deep-copy",
+            "version": "1.10.2",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/myclabs/DeepCopy.git",
+                "reference": "776f831124e9c62e1a2c601ecc52e776d8bb7220"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/myclabs/DeepCopy/zipball/776f831124e9c62e1a2c601ecc52e776d8bb7220",
+                "reference": "776f831124e9c62e1a2c601ecc52e776d8bb7220",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^7.1 || ^8.0"
+            },
+            "require-dev": {
+                "doctrine/collections": "^1.0",
+                "doctrine/common": "^2.6",
+                "phpunit/phpunit": "^7.1"
+            },
+            "type": "library",
+            "autoload": {
+                "psr-4": {
+                    "DeepCopy\\": "src/DeepCopy/"
+                },
+                "files": [
+                    "src/DeepCopy/deep_copy.php"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "description": "Create deep copies (clones) of your objects",
+            "keywords": [
+                "clone",
+                "copy",
+                "duplicate",
+                "object",
+                "object graph"
+            ],
+            "support": {
+                "issues": "https://github.com/myclabs/DeepCopy/issues",
+                "source": "https://github.com/myclabs/DeepCopy/tree/1.10.2"
+            },
+            "funding": [
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/myclabs/deep-copy",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2020-11-13T09:40:50+00:00"
+        },
+        {
+            "name": "phar-io/manifest",
+            "version": "2.0.3",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/phar-io/manifest.git",
+                "reference": "97803eca37d319dfa7826cc2437fc020857acb53"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/phar-io/manifest/zipball/97803eca37d319dfa7826cc2437fc020857acb53",
+                "reference": "97803eca37d319dfa7826cc2437fc020857acb53",
+                "shasum": ""
+            },
+            "require": {
+                "ext-dom": "*",
+                "ext-phar": "*",
+                "ext-xmlwriter": "*",
+                "phar-io/version": "^3.0.1",
+                "php": "^7.2 || ^8.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "2.0.x-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Arne Blankerts",
+                    "email": "arne@blankerts.de",
+                    "role": "Developer"
+                },
+                {
+                    "name": "Sebastian Heuer",
+                    "email": "sebastian@phpeople.de",
+                    "role": "Developer"
+                },
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de",
+                    "role": "Developer"
+                }
+            ],
+            "description": "Component for reading phar.io manifest information from a PHP Archive (PHAR)",
+            "support": {
+                "issues": "https://github.com/phar-io/manifest/issues",
+                "source": "https://github.com/phar-io/manifest/tree/2.0.3"
+            },
+            "time": "2021-07-20T11:28:43+00:00"
+        },
+        {
+            "name": "phar-io/version",
+            "version": "3.1.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/phar-io/version.git",
+                "reference": "bae7c545bef187884426f042434e561ab1ddb182"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/phar-io/version/zipball/bae7c545bef187884426f042434e561ab1ddb182",
+                "reference": "bae7c545bef187884426f042434e561ab1ddb182",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^7.2 || ^8.0"
+            },
+            "type": "library",
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Arne Blankerts",
+                    "email": "arne@blankerts.de",
+                    "role": "Developer"
+                },
+                {
+                    "name": "Sebastian Heuer",
+                    "email": "sebastian@phpeople.de",
+                    "role": "Developer"
+                },
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de",
+                    "role": "Developer"
+                }
+            ],
+            "description": "Library for handling version information and constraints",
+            "support": {
+                "issues": "https://github.com/phar-io/version/issues",
+                "source": "https://github.com/phar-io/version/tree/3.1.0"
+            },
+            "time": "2021-02-23T14:00:09+00:00"
+        },
         {
             "name": "phpdocumentor/reflection-common",
             "version": "2.2.0",
@@ -2087,213 +2253,1121 @@
             "time": "2021-12-08T12:19:24+00:00"
         },
         {
-            "name": "sebastian/comparator",
-            "version": "3.0.3",
+            "name": "phpstan/phpstan",
+            "version": "1.2.0",
             "source": {
                 "type": "git",
-                "url": "https://github.com/sebastianbergmann/comparator.git",
-                "reference": "1071dfcef776a57013124ff35e1fc41ccd294758"
+                "url": "https://github.com/phpstan/phpstan.git",
+                "reference": "cbe085f9fdead5b6d62e4c022ca52dc9427a10ee"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/sebastianbergmann/comparator/zipball/1071dfcef776a57013124ff35e1fc41ccd294758",
-                "reference": "1071dfcef776a57013124ff35e1fc41ccd294758",
+                "url": "https://api.github.com/repos/phpstan/phpstan/zipball/cbe085f9fdead5b6d62e4c022ca52dc9427a10ee",
+                "reference": "cbe085f9fdead5b6d62e4c022ca52dc9427a10ee",
                 "shasum": ""
             },
             "require": {
-                "php": ">=7.1",
-                "sebastian/diff": "^3.0",
-                "sebastian/exporter": "^3.1"
+                "php": "^7.1|^8.0"
             },
-            "require-dev": {
-                "phpunit/phpunit": "^8.5"
+            "conflict": {
+                "phpstan/phpstan-shim": "*"
             },
+            "bin": [
+                "phpstan",
+                "phpstan.phar"
+            ],
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "3.0-dev"
+                    "dev-master": "1.2-dev"
                 }
             },
             "autoload": {
-                "classmap": [
-                    "src/"
+                "files": [
+                    "bootstrap.php"
                 ]
             },
             "notification-url": "https://packagist.org/downloads/",
             "license": [
-                "BSD-3-Clause"
+                "MIT"
             ],
-            "authors": [
+            "description": "PHPStan - PHP Static Analysis Tool",
+            "support": {
+                "issues": "https://github.com/phpstan/phpstan/issues",
+                "source": "https://github.com/phpstan/phpstan/tree/1.2.0"
+            },
+            "funding": [
                 {
-                    "name": "Sebastian Bergmann",
-                    "email": "sebastian@phpunit.de"
+                    "url": "https://github.com/ondrejmirtes",
+                    "type": "github"
                 },
                 {
-                    "name": "Jeff Welch",
-                    "email": "whatthejeff@gmail.com"
+                    "url": "https://github.com/phpstan",
+                    "type": "github"
                 },
                 {
-                    "name": "Volker Dusch",
-                    "email": "github@wallbash.com"
+                    "url": "https://www.patreon.com/phpstan",
+                    "type": "patreon"
                 },
                 {
-                    "name": "Bernhard Schussek",
-                    "email": "bschussek@2bepublished.at"
-                }
-            ],
-            "description": "Provides the functionality to compare PHP values for equality",
-            "homepage": "https://github.com/sebastianbergmann/comparator",
-            "keywords": [
-                "comparator",
-                "compare",
-                "equality"
-            ],
-            "support": {
-                "issues": "https://github.com/sebastianbergmann/comparator/issues",
-                "source": "https://github.com/sebastianbergmann/comparator/tree/3.0.3"
-            },
-            "funding": [
-                {
-                    "url": "https://github.com/sebastianbergmann",
-                    "type": "github"
+                    "url": "https://tidelift.com/funding/github/packagist/phpstan/phpstan",
+                    "type": "tidelift"
                 }
             ],
-            "time": "2020-11-30T08:04:30+00:00"
+            "time": "2021-11-18T14:09:01+00:00"
         },
         {
-            "name": "sebastian/diff",
-            "version": "3.0.3",
+            "name": "phpstan/phpstan-deprecation-rules",
+            "version": "1.0.0",
             "source": {
                 "type": "git",
-                "url": "https://github.com/sebastianbergmann/diff.git",
-                "reference": "14f72dd46eaf2f2293cbe79c93cc0bc43161a211"
+                "url": "https://github.com/phpstan/phpstan-deprecation-rules.git",
+                "reference": "e5ccafb0dd8d835dd65d8d7a1a0d2b1b75414682"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/sebastianbergmann/diff/zipball/14f72dd46eaf2f2293cbe79c93cc0bc43161a211",
-                "reference": "14f72dd46eaf2f2293cbe79c93cc0bc43161a211",
+                "url": "https://api.github.com/repos/phpstan/phpstan-deprecation-rules/zipball/e5ccafb0dd8d835dd65d8d7a1a0d2b1b75414682",
+                "reference": "e5ccafb0dd8d835dd65d8d7a1a0d2b1b75414682",
                 "shasum": ""
             },
             "require": {
-                "php": ">=7.1"
+                "php": "^7.1 || ^8.0",
+                "phpstan/phpstan": "^1.0"
             },
             "require-dev": {
-                "phpunit/phpunit": "^7.5 || ^8.0",
-                "symfony/process": "^2 || ^3.3 || ^4"
+                "php-parallel-lint/php-parallel-lint": "^1.2",
+                "phpstan/phpstan-phpunit": "^1.0",
+                "phpunit/phpunit": "^9.5"
             },
-            "type": "library",
+            "type": "phpstan-extension",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "3.0-dev"
+                    "dev-master": "1.0-dev"
+                },
+                "phpstan": {
+                    "includes": [
+                        "rules.neon"
+                    ]
                 }
             },
             "autoload": {
-                "classmap": [
-                    "src/"
-                ]
+                "psr-4": {
+                    "PHPStan\\": "src/"
+                }
             },
             "notification-url": "https://packagist.org/downloads/",
             "license": [
-                "BSD-3-Clause"
+                "MIT"
             ],
-            "authors": [
-                {
-                    "name": "Sebastian Bergmann",
-                    "email": "sebastian@phpunit.de"
+            "description": "PHPStan rules for detecting usage of deprecated classes, methods, properties, constants and traits.",
+            "support": {
+                "issues": "https://github.com/phpstan/phpstan-deprecation-rules/issues",
+                "source": "https://github.com/phpstan/phpstan-deprecation-rules/tree/1.0.0"
+            },
+            "time": "2021-09-23T11:02:21+00:00"
+        },
+        {
+            "name": "phpstan/phpstan-phpunit",
+            "version": "1.0.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/phpstan/phpstan-phpunit.git",
+                "reference": "9eb88c9f689003a8a2a5ae9e010338ee94dc39b3"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/phpstan/phpstan-phpunit/zipball/9eb88c9f689003a8a2a5ae9e010338ee94dc39b3",
+                "reference": "9eb88c9f689003a8a2a5ae9e010338ee94dc39b3",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^7.1 || ^8.0",
+                "phpstan/phpstan": "^1.0"
+            },
+            "conflict": {
+                "phpunit/phpunit": "<7.0"
+            },
+            "require-dev": {
+                "nikic/php-parser": "^4.13.0",
+                "php-parallel-lint/php-parallel-lint": "^1.2",
+                "phpstan/phpstan-strict-rules": "^1.0",
+                "phpunit/phpunit": "^9.5"
+            },
+            "type": "phpstan-extension",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.0-dev"
                 },
-                {
-                    "name": "Kore Nordmann",
-                    "email": "mail@kore-nordmann.de"
+                "phpstan": {
+                    "includes": [
+                        "extension.neon",
+                        "rules.neon"
+                    ]
                 }
-            ],
-            "description": "Diff implementation",
-            "homepage": "https://github.com/sebastianbergmann/diff",
-            "keywords": [
-                "diff",
-                "udiff",
-                "unidiff",
-                "unified diff"
-            ],
-            "support": {
-                "issues": "https://github.com/sebastianbergmann/diff/issues",
-                "source": "https://github.com/sebastianbergmann/diff/tree/3.0.3"
             },
-            "funding": [
-                {
-                    "url": "https://github.com/sebastianbergmann",
-                    "type": "github"
+            "autoload": {
+                "psr-4": {
+                    "PHPStan\\": "src/"
                 }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
             ],
-            "time": "2020-11-30T07:59:04+00:00"
+            "description": "PHPUnit extensions and rules for PHPStan",
+            "support": {
+                "issues": "https://github.com/phpstan/phpstan-phpunit/issues",
+                "source": "https://github.com/phpstan/phpstan-phpunit/tree/1.0.0"
+            },
+            "time": "2021-10-14T08:03:54+00:00"
         },
         {
-            "name": "sebastian/exporter",
-            "version": "3.1.4",
+            "name": "phpstan/phpstan-strict-rules",
+            "version": "1.1.0",
             "source": {
                 "type": "git",
-                "url": "https://github.com/sebastianbergmann/exporter.git",
-                "reference": "0c32ea2e40dbf59de29f3b49bf375176ce7dd8db"
+                "url": "https://github.com/phpstan/phpstan-strict-rules.git",
+                "reference": "e12d55f74a8cca18c6e684c6450767e055ba7717"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/sebastianbergmann/exporter/zipball/0c32ea2e40dbf59de29f3b49bf375176ce7dd8db",
-                "reference": "0c32ea2e40dbf59de29f3b49bf375176ce7dd8db",
+                "url": "https://api.github.com/repos/phpstan/phpstan-strict-rules/zipball/e12d55f74a8cca18c6e684c6450767e055ba7717",
+                "reference": "e12d55f74a8cca18c6e684c6450767e055ba7717",
                 "shasum": ""
             },
             "require": {
-                "php": ">=7.0",
-                "sebastian/recursion-context": "^3.0"
+                "php": "^7.1 || ^8.0",
+                "phpstan/phpstan": "^1.2.0"
             },
             "require-dev": {
-                "ext-mbstring": "*",
-                "phpunit/phpunit": "^8.5"
+                "nikic/php-parser": "^4.13.0",
+                "php-parallel-lint/php-parallel-lint": "^1.2",
+                "phpstan/phpstan-phpunit": "^1.0",
+                "phpunit/phpunit": "^9.5"
             },
-            "type": "library",
+            "type": "phpstan-extension",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "3.1.x-dev"
+                    "dev-master": "1.0-dev"
+                },
+                "phpstan": {
+                    "includes": [
+                        "rules.neon"
+                    ]
                 }
             },
             "autoload": {
-                "classmap": [
-                    "src/"
-                ]
+                "psr-4": {
+                    "PHPStan\\": "src/"
+                }
             },
             "notification-url": "https://packagist.org/downloads/",
             "license": [
-                "BSD-3-Clause"
+                "MIT"
             ],
-            "authors": [
-                {
-                    "name": "Sebastian Bergmann",
+            "description": "Extra strict and opinionated rules for PHPStan",
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+            "time": "2020-11-30T07:53:42+00:00"
+        },
+        {
+            "name": "sebastian/exporter",
+            "version": "3.1.4",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/exporter.git",
+                "reference": "0c32ea2e40dbf59de29f3b49bf375176ce7dd8db"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/exporter/zipball/0c32ea2e40dbf59de29f3b49bf375176ce7dd8db",
+                "reference": "0c32ea2e40dbf59de29f3b49bf375176ce7dd8db",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=7.0",
+                "sebastian/recursion-context": "^3.0"
+            },
+            "require-dev": {
+                "ext-mbstring": "*",
+                "phpunit/phpunit": "^8.5"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "3.1.x-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
                     "email": "sebastian@phpunit.de"
                 },
                 {
-                    "name": "Jeff Welch",
-                    "email": "whatthejeff@gmail.com"
-                },
+                    "name": "Jeff Welch",
+                    "email": "whatthejeff@gmail.com"
+                },
+                {
+                    "name": "Volker Dusch",
+                    "email": "github@wallbash.com"
+                },
+                {
+                    "name": "Adam Harvey",
+                    "email": "aharvey@php.net"
+                },
+                {
+                    "name": "Bernhard Schussek",
+                    "email": "bschussek@gmail.com"
+                }
+            ],
+            "description": "Provides the functionality to export PHP variables for visualization",
+            "homepage": "http://www.github.com/sebastianbergmann/exporter",
+            "keywords": [
+                "export",
+                "exporter"
+            ],
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/exporter/issues",
+                "source": "https://github.com/sebastianbergmann/exporter/tree/3.1.4"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2021-11-11T13:51:24+00:00"
+        },
+        {
+            "name": "sebastian/global-state",
+            "version": "3.0.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/global-state.git",
+                "reference": "474fb9edb7ab891665d3bfc6317f42a0a150454b"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/global-state/zipball/474fb9edb7ab891665d3bfc6317f42a0a150454b",
+                "reference": "474fb9edb7ab891665d3bfc6317f42a0a150454b",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=7.2",
+                "sebastian/object-reflector": "^1.1.1",
+                "sebastian/recursion-context": "^3.0"
+            },
+            "require-dev": {
+                "ext-dom": "*",
+                "phpunit/phpunit": "^8.0"
+            },
+            "suggest": {
+                "ext-uopz": "*"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "3.0-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de"
+                }
+            ],
+            "description": "Snapshotting of global state",
+            "homepage": "http://www.github.com/sebastianbergmann/global-state",
+            "keywords": [
+                "global state"
+            ],
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/global-state/issues",
+                "source": "https://github.com/sebastianbergmann/global-state/tree/3.0.1"
+            },
+            "funding": [
                 {
-                    "name": "Volker Dusch",
-                    "email": "github@wallbash.com"
-                },
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2020-11-30T07:43:24+00:00"
+        },
+        {
+            "name": "sebastian/object-enumerator",
+            "version": "3.0.4",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/object-enumerator.git",
+                "reference": "e67f6d32ebd0c749cf9d1dbd9f226c727043cdf2"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/object-enumerator/zipball/e67f6d32ebd0c749cf9d1dbd9f226c727043cdf2",
+                "reference": "e67f6d32ebd0c749cf9d1dbd9f226c727043cdf2",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=7.0",
+                "sebastian/object-reflector": "^1.1.1",
+                "sebastian/recursion-context": "^3.0"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^6.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "3.0.x-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
                 {
-                    "name": "Adam Harvey",
-                    "email": "aharvey@php.net"
-                },
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de"
+                }
+            ],
+            "description": "Traverses array structures and object graphs to enumerate all referenced objects",
+            "homepage": "https://github.com/sebastianbergmann/object-enumerator/",
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/object-enumerator/issues",
+                "source": "https://github.com/sebastianbergmann/object-enumerator/tree/3.0.4"
+            },
+            "funding": [
                 {
-                    "name": "Bernhard Schussek",
-                    "email": "bschussek@gmail.com"
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
                 }
             ],
-            "description": "Provides the functionality to export PHP variables for visualization",
-            "homepage": "http://www.github.com/sebastianbergmann/exporter",
-            "keywords": [
-                "export",
-                "exporter"
+            "time": "2020-11-30T07:40:27+00:00"
+        },
+        {
+            "name": "sebastian/object-reflector",
+            "version": "1.1.2",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/object-reflector.git",
+                "reference": "9b8772b9cbd456ab45d4a598d2dd1a1bced6363d"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/object-reflector/zipball/9b8772b9cbd456ab45d4a598d2dd1a1bced6363d",
+                "reference": "9b8772b9cbd456ab45d4a598d2dd1a1bced6363d",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=7.0"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^6.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.1-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de"
+                }
             ],
+            "description": "Allows reflection of object attributes, including inherited and non-public ones",
+            "homepage": "https://github.com/sebastianbergmann/object-reflector/",
             "support": {
-                "issues": "https://github.com/sebastianbergmann/exporter/issues",
-                "source": "https://github.com/sebastianbergmann/exporter/tree/3.1.4"
+                "issues": "https://github.com/sebastianbergmann/object-reflector/issues",
+                "source": "https://github.com/sebastianbergmann/object-reflector/tree/1.1.2"
             },
             "funding": [
                 {
@@ -2301,7 +3375,7 @@
                     "type": "github"
                 }
             ],
-            "time": "2021-11-11T13:51:24+00:00"
+            "time": "2020-11-30T07:37:18+00:00"
         },
         {
             "name": "sebastian/recursion-context",
@@ -2366,6 +3440,161 @@
             ],
             "time": "2020-11-30T07:34:24+00:00"
         },
+        {
+            "name": "sebastian/resource-operations",
+            "version": "2.0.2",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/resource-operations.git",
+                "reference": "31d35ca87926450c44eae7e2611d45a7a65ea8b3"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/resource-operations/zipball/31d35ca87926450c44eae7e2611d45a7a65ea8b3",
+                "reference": "31d35ca87926450c44eae7e2611d45a7a65ea8b3",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=7.1"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "2.0-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de"
+                }
+            ],
+            "description": "Provides a list of PHP built-in functions that operate on resources",
+            "homepage": "https://www.github.com/sebastianbergmann/resource-operations",
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/resource-operations/issues",
+                "source": "https://github.com/sebastianbergmann/resource-operations/tree/2.0.2"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2020-11-30T07:30:19+00:00"
+        },
+        {
+            "name": "sebastian/type",
+            "version": "1.1.4",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/type.git",
+                "reference": "0150cfbc4495ed2df3872fb31b26781e4e077eb4"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/type/zipball/0150cfbc4495ed2df3872fb31b26781e4e077eb4",
+                "reference": "0150cfbc4495ed2df3872fb31b26781e4e077eb4",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=7.2"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^8.2"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.1-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de",
+                    "role": "lead"
+                }
+            ],
+            "description": "Collection of value objects that represent the types of the PHP type system",
+            "homepage": "https://github.com/sebastianbergmann/type",
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/type/issues",
+                "source": "https://github.com/sebastianbergmann/type/tree/1.1.4"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2020-11-30T07:25:11+00:00"
+        },
+        {
+            "name": "sebastian/version",
+            "version": "2.0.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/version.git",
+                "reference": "99732be0ddb3361e16ad77b68ba41efc8e979019"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/version/zipball/99732be0ddb3361e16ad77b68ba41efc8e979019",
+                "reference": "99732be0ddb3361e16ad77b68ba41efc8e979019",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=5.6"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "2.0.x-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de",
+                    "role": "lead"
+                }
+            ],
+            "description": "Library that helps with managing the version number of Git-hosted PHP projects",
+            "homepage": "https://github.com/sebastianbergmann/version",
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/version/issues",
+                "source": "https://github.com/sebastianbergmann/version/tree/master"
+            },
+            "time": "2016-10-03T07:35:21+00:00"
+        },
         {
             "name": "symfony/phpunit-bridge",
             "version": "v6.0.0",
@@ -2449,6 +3678,56 @@
             ],
             "time": "2021-11-29T15:32:57+00:00"
         },
+        {
+            "name": "theseer/tokenizer",
+            "version": "1.2.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/theseer/tokenizer.git",
+                "reference": "34a41e998c2183e22995f158c581e7b5e755ab9e"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/theseer/tokenizer/zipball/34a41e998c2183e22995f158c581e7b5e755ab9e",
+                "reference": "34a41e998c2183e22995f158c581e7b5e755ab9e",
+                "shasum": ""
+            },
+            "require": {
+                "ext-dom": "*",
+                "ext-tokenizer": "*",
+                "ext-xmlwriter": "*",
+                "php": "^7.2 || ^8.0"
+            },
+            "type": "library",
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Arne Blankerts",
+                    "email": "arne@blankerts.de",
+                    "role": "Developer"
+                }
+            ],
+            "description": "A small library for converting tokenized PHP source code into XML and potentially other formats",
+            "support": {
+                "issues": "https://github.com/theseer/tokenizer/issues",
+                "source": "https://github.com/theseer/tokenizer/tree/1.2.1"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/theseer",
+                    "type": "github"
+                }
+            ],
+            "time": "2021-07-28T10:34:58+00:00"
+        },
         {
             "name": "webmozart/assert",
             "version": "1.10.0",
diff --git a/tests/Composer/Test/AllFunctionalTest.php b/tests/Composer/Test/AllFunctionalTest.php
index aefea3312228..bec7958212a4 100644
--- a/tests/Composer/Test/AllFunctionalTest.php
+++ b/tests/Composer/Test/AllFunctionalTest.php
@@ -31,14 +31,14 @@ class AllFunctionalTest extends TestCase
      */
     private static $pharPath;
 
-    public function setUp()
+    public function setUp(): void
     {
         $this->oldcwd = getcwd();
 
         chdir(__DIR__.'/Fixtures/functional');
     }
 
-    public function tearDown()
+    public function tearDown(): void
     {
         if ($this->oldcwd) {
             chdir($this->oldcwd);
@@ -51,12 +51,12 @@ public function tearDown()
         }
     }
 
-    public static function setUpBeforeClass()
+    public static function setUpBeforeClass(): void
     {
         self::$pharPath = self::getUniqueTmpDirectory() . '/composer.phar';
     }
 
-    public static function tearDownAfterClass()
+    public static function tearDownAfterClass(): void
     {
         $fs = new Filesystem;
         $fs->removeDirectory(dirname(self::$pharPath));
diff --git a/tests/Composer/Test/ApplicationTest.php b/tests/Composer/Test/ApplicationTest.php
index e55d31d99d39..f2303243706a 100644
--- a/tests/Composer/Test/ApplicationTest.php
+++ b/tests/Composer/Test/ApplicationTest.php
@@ -18,7 +18,7 @@
 
 class ApplicationTest extends TestCase
 {
-    public function tearDown()
+    public function tearDown(): void
     {
         parent::tearDown();
 
diff --git a/tests/Composer/Test/Autoload/AutoloadGeneratorTest.php b/tests/Composer/Test/Autoload/AutoloadGeneratorTest.php
index 0a801ad63c83..da24ce51f478 100644
--- a/tests/Composer/Test/Autoload/AutoloadGeneratorTest.php
+++ b/tests/Composer/Test/Autoload/AutoloadGeneratorTest.php
@@ -89,7 +89,7 @@ class AutoloadGeneratorTest extends TestCase
      */
     public $configValueMap;
 
-    protected function setUp()
+    protected function setUp(): void
     {
         $this->fs = new Filesystem;
         $that = $this;
@@ -148,7 +148,7 @@ protected function setUp()
         $this->generator = new AutoloadGenerator($this->eventDispatcher);
     }
 
-    protected function tearDown()
+    protected function tearDown(): void
     {
         chdir($this->origDir);
 
diff --git a/tests/Composer/Test/CacheTest.php b/tests/Composer/Test/CacheTest.php
index 2d2fba28c73d..2429c303f297 100644
--- a/tests/Composer/Test/CacheTest.php
+++ b/tests/Composer/Test/CacheTest.php
@@ -28,7 +28,7 @@ class CacheTest extends TestCase
     /** @var Cache&\PHPUnit\Framework\MockObject\MockObject */
     private $cache;
 
-    public function setUp()
+    public function setUp(): void
     {
         $this->root = $this->getUniqueTmpDirectory();
         $this->files = array();
@@ -53,7 +53,7 @@ public function setUp()
             ->will($this->returnValue($this->finder));
     }
 
-    protected function tearDown()
+    protected function tearDown(): void
     {
         if (is_dir($this->root)) {
             $fs = new Filesystem;
diff --git a/tests/Composer/Test/Config/JsonConfigSourceTest.php b/tests/Composer/Test/Config/JsonConfigSourceTest.php
index 4e1000b5e1c8..1f725004f22c 100644
--- a/tests/Composer/Test/Config/JsonConfigSourceTest.php
+++ b/tests/Composer/Test/Config/JsonConfigSourceTest.php
@@ -34,13 +34,13 @@ protected function fixturePath($name)
         return __DIR__.'/Fixtures/'.$name;
     }
 
-    protected function setUp()
+    protected function setUp(): void
     {
         $this->fs = new Filesystem;
         $this->workingDir = $this->getUniqueTmpDirectory();
     }
 
-    protected function tearDown()
+    protected function tearDown(): void
     {
         if (is_dir($this->workingDir)) {
             $this->fs->removeDirectory($this->workingDir);
diff --git a/tests/Composer/Test/DependencyResolver/DefaultPolicyTest.php b/tests/Composer/Test/DependencyResolver/DefaultPolicyTest.php
index cae72c66d900..9703706d5d93 100644
--- a/tests/Composer/Test/DependencyResolver/DefaultPolicyTest.php
+++ b/tests/Composer/Test/DependencyResolver/DefaultPolicyTest.php
@@ -32,7 +32,7 @@ class DefaultPolicyTest extends TestCase
     /** @var DefaultPolicy */
     protected $policy;
 
-    public function setUp()
+    public function setUp(): void
     {
         $this->repositorySet = new RepositorySet('dev');
         $this->repo = new ArrayRepository;
diff --git a/tests/Composer/Test/DependencyResolver/RuleSetIteratorTest.php b/tests/Composer/Test/DependencyResolver/RuleSetIteratorTest.php
index f0321a42c65d..3f2429024152 100644
--- a/tests/Composer/Test/DependencyResolver/RuleSetIteratorTest.php
+++ b/tests/Composer/Test/DependencyResolver/RuleSetIteratorTest.php
@@ -27,7 +27,7 @@ class RuleSetIteratorTest extends TestCase
     /** @var Pool */
     protected $pool;
 
-    protected function setUp()
+    protected function setUp(): void
     {
         $this->pool = new Pool();
 
diff --git a/tests/Composer/Test/DependencyResolver/SolverTest.php b/tests/Composer/Test/DependencyResolver/SolverTest.php
index 7afb38c2e702..f62d5230ffd5 100644
--- a/tests/Composer/Test/DependencyResolver/SolverTest.php
+++ b/tests/Composer/Test/DependencyResolver/SolverTest.php
@@ -48,7 +48,7 @@ class SolverTest extends TestCase
     /** @var Pool */
     protected $pool;
 
-    public function setUp()
+    public function setUp(): void
     {
         $this->repoSet = new RepositorySet();
         $this->repo = new ArrayRepository;
diff --git a/tests/Composer/Test/DependencyResolver/TransactionTest.php b/tests/Composer/Test/DependencyResolver/TransactionTest.php
index 76f6beedec51..4c19a6098a63 100644
--- a/tests/Composer/Test/DependencyResolver/TransactionTest.php
+++ b/tests/Composer/Test/DependencyResolver/TransactionTest.php
@@ -23,7 +23,7 @@
 
 class TransactionTest extends TestCase
 {
-    public function setUp()
+    public function setUp(): void
     {
     }
 
diff --git a/tests/Composer/Test/Downloader/DownloadManagerTest.php b/tests/Composer/Test/Downloader/DownloadManagerTest.php
index db4ccbda81fc..eca909696457 100644
--- a/tests/Composer/Test/Downloader/DownloadManagerTest.php
+++ b/tests/Composer/Test/Downloader/DownloadManagerTest.php
@@ -23,7 +23,7 @@ class DownloadManagerTest extends TestCase
     /** @var \Composer\IO\IOInterface&\PHPUnit\Framework\MockObject\MockObject */
     protected $io;
 
-    public function setUp()
+    public function setUp(): void
     {
         $this->filesystem = $this->getMockBuilder('Composer\Util\Filesystem')->getMock();
         $this->io = $this->getMockBuilder('Composer\IO\IOInterface')->getMock();
diff --git a/tests/Composer/Test/Downloader/FileDownloaderTest.php b/tests/Composer/Test/Downloader/FileDownloaderTest.php
index 7ad59b30da89..047b2c8db95e 100644
--- a/tests/Composer/Test/Downloader/FileDownloaderTest.php
+++ b/tests/Composer/Test/Downloader/FileDownloaderTest.php
@@ -30,7 +30,7 @@ class FileDownloaderTest extends TestCase
     /** @var \Composer\Config&\PHPUnit\Framework\MockObject\MockObject */
     private $config;
 
-    public function setUp()
+    public function setUp(): void
     {
         $this->httpDownloader = $this->getMockBuilder('Composer\Util\HttpDownloader')->disableOriginalConstructor()->getMock();
         $this->config = $this->getMockBuilder('Composer\Config')->getMock();
diff --git a/tests/Composer/Test/Downloader/FossilDownloaderTest.php b/tests/Composer/Test/Downloader/FossilDownloaderTest.php
index 05978d4dbe85..dd15eff913bb 100644
--- a/tests/Composer/Test/Downloader/FossilDownloaderTest.php
+++ b/tests/Composer/Test/Downloader/FossilDownloaderTest.php
@@ -22,12 +22,12 @@ class FossilDownloaderTest extends TestCase
     /** @var string */
     private $workingDir;
 
-    protected function setUp()
+    protected function setUp(): void
     {
         $this->workingDir = $this->getUniqueTmpDirectory();
     }
 
-    protected function tearDown()
+    protected function tearDown(): void
     {
         if (is_dir($this->workingDir)) {
             $fs = new Filesystem;
diff --git a/tests/Composer/Test/Downloader/GitDownloaderTest.php b/tests/Composer/Test/Downloader/GitDownloaderTest.php
index d3b046406542..e9629338cd9c 100644
--- a/tests/Composer/Test/Downloader/GitDownloaderTest.php
+++ b/tests/Composer/Test/Downloader/GitDownloaderTest.php
@@ -27,7 +27,7 @@ class GitDownloaderTest extends TestCase
     /** @var string */
     private $workingDir;
 
-    protected function setUp()
+    protected function setUp(): void
     {
         $this->skipIfNotExecutable('git');
 
@@ -37,7 +37,7 @@ protected function setUp()
         $this->workingDir = $this->getUniqueTmpDirectory();
     }
 
-    protected function tearDown()
+    protected function tearDown(): void
     {
         if (is_dir($this->workingDir)) {
             $this->fs->removeDirectory($this->workingDir);
diff --git a/tests/Composer/Test/Downloader/HgDownloaderTest.php b/tests/Composer/Test/Downloader/HgDownloaderTest.php
index 3c3015a23752..c36ec247b39f 100644
--- a/tests/Composer/Test/Downloader/HgDownloaderTest.php
+++ b/tests/Composer/Test/Downloader/HgDownloaderTest.php
@@ -22,12 +22,12 @@ class HgDownloaderTest extends TestCase
     /** @var string */
     private $workingDir;
 
-    protected function setUp()
+    protected function setUp(): void
     {
         $this->workingDir = $this->getUniqueTmpDirectory();
     }
 
-    protected function tearDown()
+    protected function tearDown(): void
     {
         if (is_dir($this->workingDir)) {
             $fs = new Filesystem;
diff --git a/tests/Composer/Test/Downloader/PerforceDownloaderTest.php b/tests/Composer/Test/Downloader/PerforceDownloaderTest.php
index 95bf048d3d98..a5c8e2e3f396 100644
--- a/tests/Composer/Test/Downloader/PerforceDownloaderTest.php
+++ b/tests/Composer/Test/Downloader/PerforceDownloaderTest.php
@@ -43,7 +43,7 @@ class PerforceDownloaderTest extends TestCase
     /** @var string */
     protected $testPath;
 
-    protected function setUp()
+    protected function setUp(): void
     {
         $this->testPath = $this->getUniqueTmpDirectory();
         $this->repoConfig = $this->getRepoConfig();
diff --git a/tests/Composer/Test/Downloader/XzDownloaderTest.php b/tests/Composer/Test/Downloader/XzDownloaderTest.php
index 1b28e707a200..7032004e17c3 100644
--- a/tests/Composer/Test/Downloader/XzDownloaderTest.php
+++ b/tests/Composer/Test/Downloader/XzDownloaderTest.php
@@ -31,7 +31,7 @@ class XzDownloaderTest extends TestCase
      */
     private $testDir;
 
-    public function setUp()
+    public function setUp(): void
     {
         if (Platform::isWindows()) {
             $this->markTestSkipped('Skip test on Windows');
@@ -39,7 +39,7 @@ public function setUp()
         $this->testDir = $this->getUniqueTmpDirectory();
     }
 
-    public function tearDown()
+    public function tearDown(): void
     {
         $this->fs = new Filesystem;
         $this->fs->removeDirectory($this->testDir);
diff --git a/tests/Composer/Test/Downloader/ZipDownloaderTest.php b/tests/Composer/Test/Downloader/ZipDownloaderTest.php
index b8e148f2b76f..7e1f33119a6c 100644
--- a/tests/Composer/Test/Downloader/ZipDownloaderTest.php
+++ b/tests/Composer/Test/Downloader/ZipDownloaderTest.php
@@ -32,7 +32,7 @@ class ZipDownloaderTest extends TestCase
     /** @var \Composer\Package\PackageInterface&\PHPUnit\Framework\MockObject\MockObject */
     private $package;
 
-    public function setUp()
+    public function setUp(): void
     {
         $this->testDir = $this->getUniqueTmpDirectory();
         $this->io = $this->getMockBuilder('Composer\IO\IOInterface')->getMock();
@@ -42,7 +42,7 @@ public function setUp()
         $this->package = $this->getMockBuilder('Composer\Package\PackageInterface')->getMock();
     }
 
-    public function tearDown()
+    public function tearDown(): void
     {
         $fs = new Filesystem;
         $fs->removeDirectory($this->testDir);
diff --git a/tests/Composer/Test/InstalledVersionsTest.php b/tests/Composer/Test/InstalledVersionsTest.php
index d66005b54c1d..b0317e6c4571 100644
--- a/tests/Composer/Test/InstalledVersionsTest.php
+++ b/tests/Composer/Test/InstalledVersionsTest.php
@@ -22,7 +22,7 @@ class InstalledVersionsTest extends TestCase
      */
     private $root;
 
-    public static function setUpBeforeClass()
+    public static function setUpBeforeClass(): void
     {
         // disable multiple-ClassLoader-based checks of InstalledVersions by making it seem like no
         // class loaders are registered
@@ -31,12 +31,12 @@ public static function setUpBeforeClass()
         $prop->setValue(array());
     }
 
-    public static function tearDownAfterClass()
+    public static function tearDownAfterClass(): void
     {
         self::setUpBeforeClass();
     }
 
-    public function setUp()
+    public function setUp(): void
     {
         $this->root = $this->getUniqueTmpDirectory();
 
diff --git a/tests/Composer/Test/Installer/BinaryInstallerTest.php b/tests/Composer/Test/Installer/BinaryInstallerTest.php
index b862556de6a0..2a15903ef4bc 100644
--- a/tests/Composer/Test/Installer/BinaryInstallerTest.php
+++ b/tests/Composer/Test/Installer/BinaryInstallerTest.php
@@ -46,7 +46,7 @@ class BinaryInstallerTest extends TestCase
      */
     protected $fs;
 
-    protected function setUp()
+    protected function setUp(): void
     {
         $this->fs = new Filesystem;
 
@@ -60,7 +60,7 @@ protected function setUp()
         $this->io = $this->getMockBuilder('Composer\IO\IOInterface')->getMock();
     }
 
-    protected function tearDown()
+    protected function tearDown(): void
     {
         $this->fs->removeDirectory($this->rootDir);
     }
diff --git a/tests/Composer/Test/Installer/InstallationManagerTest.php b/tests/Composer/Test/Installer/InstallationManagerTest.php
index 687094a74861..ba4c070715e3 100644
--- a/tests/Composer/Test/Installer/InstallationManagerTest.php
+++ b/tests/Composer/Test/Installer/InstallationManagerTest.php
@@ -36,7 +36,7 @@ class InstallationManagerTest extends TestCase
      */
     protected $io;
 
-    public function setUp()
+    public function setUp(): void
     {
         $this->loop = $this->getMockBuilder('Composer\Util\Loop')->disableOriginalConstructor()->getMock();
         $this->repository = $this->getMockBuilder('Composer\Repository\InstalledRepositoryInterface')->getMock();
diff --git a/tests/Composer/Test/Installer/LibraryInstallerTest.php b/tests/Composer/Test/Installer/LibraryInstallerTest.php
index ee66ce65bdf8..1e7f0ee17250 100644
--- a/tests/Composer/Test/Installer/LibraryInstallerTest.php
+++ b/tests/Composer/Test/Installer/LibraryInstallerTest.php
@@ -65,7 +65,7 @@ class LibraryInstallerTest extends TestCase
      */
     protected $fs;
 
-    protected function setUp()
+    protected function setUp(): void
     {
         $this->fs = new Filesystem;
 
@@ -96,7 +96,7 @@ protected function setUp()
         $this->io = $this->getMockBuilder('Composer\IO\IOInterface')->getMock();
     }
 
-    protected function tearDown()
+    protected function tearDown(): void
     {
         $this->fs->removeDirectory($this->rootDir);
     }
diff --git a/tests/Composer/Test/Installer/MetapackageInstallerTest.php b/tests/Composer/Test/Installer/MetapackageInstallerTest.php
index 9eedcbe70fa7..6972519e54bb 100644
--- a/tests/Composer/Test/Installer/MetapackageInstallerTest.php
+++ b/tests/Composer/Test/Installer/MetapackageInstallerTest.php
@@ -30,7 +30,7 @@ class MetapackageInstallerTest extends TestCase
      */
     private $io;
 
-    protected function setUp()
+    protected function setUp(): void
     {
         $this->repository = $this->getMockBuilder('Composer\Repository\InstalledRepositoryInterface')->getMock();
 
diff --git a/tests/Composer/Test/Installer/SuggestedPackagesReporterTest.php b/tests/Composer/Test/Installer/SuggestedPackagesReporterTest.php
index c6f5b8721357..beb4685eb66f 100644
--- a/tests/Composer/Test/Installer/SuggestedPackagesReporterTest.php
+++ b/tests/Composer/Test/Installer/SuggestedPackagesReporterTest.php
@@ -30,7 +30,7 @@ class SuggestedPackagesReporterTest extends TestCase
      */
     private $suggestedPackagesReporter;
 
-    protected function setUp()
+    protected function setUp(): void
     {
         $this->io = $this->getMockBuilder('Composer\IO\IOInterface')->getMock();
 
diff --git a/tests/Composer/Test/InstallerTest.php b/tests/Composer/Test/InstallerTest.php
index 46d2f625f415..8d15e0e5a10c 100644
--- a/tests/Composer/Test/InstallerTest.php
+++ b/tests/Composer/Test/InstallerTest.php
@@ -50,13 +50,13 @@ class InstallerTest extends TestCase
     /** @var ?string */
     protected $tempComposerHome;
 
-    public function setUp()
+    public function setUp(): void
     {
         $this->prevCwd = getcwd();
         chdir(__DIR__);
     }
 
-    public function tearDown()
+    public function tearDown(): void
     {
         Platform::clearEnv('COMPOSER_POOL_OPTIMIZER');
 
diff --git a/tests/Composer/Test/Package/Archiver/ArchivableFilesFinderTest.php b/tests/Composer/Test/Package/Archiver/ArchivableFilesFinderTest.php
index 6aad38c2c919..2cd274e11f4d 100644
--- a/tests/Composer/Test/Package/Archiver/ArchivableFilesFinderTest.php
+++ b/tests/Composer/Test/Package/Archiver/ArchivableFilesFinderTest.php
@@ -33,7 +33,7 @@ class ArchivableFilesFinderTest extends TestCase
      */
     protected $fs;
 
-    protected function setUp()
+    protected function setUp(): void
     {
         $fs = new Filesystem;
         $this->fs = $fs;
@@ -95,7 +95,7 @@ protected function setUp()
         }
     }
 
-    protected function tearDown()
+    protected function tearDown(): void
     {
         $fs = new Filesystem;
         $fs->removeDirectory($this->sources);
diff --git a/tests/Composer/Test/Package/Archiver/ArchiveManagerTest.php b/tests/Composer/Test/Package/Archiver/ArchiveManagerTest.php
index c73091ad1e3a..d54bb3339b07 100644
--- a/tests/Composer/Test/Package/Archiver/ArchiveManagerTest.php
+++ b/tests/Composer/Test/Package/Archiver/ArchiveManagerTest.php
@@ -32,7 +32,7 @@ class ArchiveManagerTest extends ArchiverTest
      */
     protected $targetDir;
 
-    public function setUp()
+    public function setUp(): void
     {
         parent::setUp();
 
diff --git a/tests/Composer/Test/Package/Archiver/ArchiverTest.php b/tests/Composer/Test/Package/Archiver/ArchiverTest.php
index 62e62cce0f16..fa09813c6102 100644
--- a/tests/Composer/Test/Package/Archiver/ArchiverTest.php
+++ b/tests/Composer/Test/Package/Archiver/ArchiverTest.php
@@ -34,14 +34,14 @@ abstract class ArchiverTest extends TestCase
      */
     protected $testDir;
 
-    public function setUp()
+    public function setUp(): void
     {
         $this->filesystem = new Filesystem();
         $this->process = new ProcessExecutor();
         $this->testDir = $this->getUniqueTmpDirectory();
     }
 
-    public function tearDown()
+    public function tearDown(): void
     {
         $this->filesystem->removeDirectory($this->testDir);
     }
diff --git a/tests/Composer/Test/Package/Dumper/ArrayDumperTest.php b/tests/Composer/Test/Package/Dumper/ArrayDumperTest.php
index c4ace9e82fbb..d894fb95433d 100644
--- a/tests/Composer/Test/Package/Dumper/ArrayDumperTest.php
+++ b/tests/Composer/Test/Package/Dumper/ArrayDumperTest.php
@@ -28,7 +28,7 @@ class ArrayDumperTest extends TestCase
      */
     private $package;
 
-    public function setUp()
+    public function setUp(): void
     {
         $this->dumper = new ArrayDumper();
         $this->package = $this->getMockBuilder('Composer\Package\CompletePackageInterface')->getMock();
diff --git a/tests/Composer/Test/Package/Loader/ArrayLoaderTest.php b/tests/Composer/Test/Package/Loader/ArrayLoaderTest.php
index 829fc633edd6..e20abaad5467 100644
--- a/tests/Composer/Test/Package/Loader/ArrayLoaderTest.php
+++ b/tests/Composer/Test/Package/Loader/ArrayLoaderTest.php
@@ -24,7 +24,7 @@ class ArrayLoaderTest extends TestCase
      */
     private $loader;
 
-    public function setUp()
+    public function setUp(): void
     {
         $this->loader = new ArrayLoader(null);
     }
diff --git a/tests/Composer/Test/Package/Version/VersionGuesserTest.php b/tests/Composer/Test/Package/Version/VersionGuesserTest.php
index 292c78946b47..64e20fbd0163 100644
--- a/tests/Composer/Test/Package/Version/VersionGuesserTest.php
+++ b/tests/Composer/Test/Package/Version/VersionGuesserTest.php
@@ -22,7 +22,7 @@
 
 class VersionGuesserTest extends TestCase
 {
-    public function setUp()
+    public function setUp(): void
     {
         if (!function_exists('proc_open')) {
             $this->markTestSkipped('proc_open() is not available');
diff --git a/tests/Composer/Test/Platform/HhvmDetectorTest.php b/tests/Composer/Test/Platform/HhvmDetectorTest.php
index 36290361af78..277ed9846e91 100644
--- a/tests/Composer/Test/Platform/HhvmDetectorTest.php
+++ b/tests/Composer/Test/Platform/HhvmDetectorTest.php
@@ -25,7 +25,7 @@ class HhvmDetectorTest extends TestCase
      */
     private $hhvmDetector;
 
-    protected function setUp()
+    protected function setUp(): void
     {
         $this->hhvmDetector = new HhvmDetector();
         $this->hhvmDetector->reset();
diff --git a/tests/Composer/Test/Plugin/PluginInstallerTest.php b/tests/Composer/Test/Plugin/PluginInstallerTest.php
index 6466571d7e78..088d5eb033bf 100644
--- a/tests/Composer/Test/Plugin/PluginInstallerTest.php
+++ b/tests/Composer/Test/Plugin/PluginInstallerTest.php
@@ -68,7 +68,7 @@ class PluginInstallerTest extends TestCase
      */
     protected $io;
 
-    protected function setUp()
+    protected function setUp(): void
     {
         $loader = new JsonLoader(new ArrayLoader());
         $this->packages = array();
@@ -127,7 +127,7 @@ protected function setUp()
         $this->composer->setPluginManager($this->pm);
     }
 
-    protected function tearDown()
+    protected function tearDown(): void
     {
         $filesystem = new Filesystem();
         $filesystem->removeDirectory($this->directory);
diff --git a/tests/Composer/Test/PolyfillTestCase.php b/tests/Composer/Test/PolyfillTestCase.php
index dd40a196bfac..da8aa3e991f3 100644
--- a/tests/Composer/Test/PolyfillTestCase.php
+++ b/tests/Composer/Test/PolyfillTestCase.php
@@ -12,10 +12,8 @@
 
 namespace Composer\Test {
     use PHPUnit\Framework\TestCase;
-    use PHPUnit\Framework\Constraint\LogicalNot;
-    use PHPUnit\Framework\Constraint\StringContains;
 
-    if (method_exists('PHPUnit\Framework\TestCase', 'assertStringContainsString')) {
+    if (method_exists('PHPUnit\Framework\TestCase', 'assertFileDoesNotExist')) {
         abstract class PolyfillTestCase extends TestCase
         {
         }
@@ -23,196 +21,6 @@ abstract class PolyfillTestCase extends TestCase
         abstract class PolyfillTestCase extends TestCase
         {
             // all the functions below are form https://github.com/symfony/phpunit-bridge/blob/bd341a45ef79b30918376e8b8e2279fac6894c3b/Legacy/PolyfillAssertTrait.php
-
-            /**
-             * @param string $message
-             *
-             * @return void
-             */
-            public static function assertIsInt($actual, $message = '')
-            {
-                static::assertInternalType('int', $actual, $message);
-            }
-
-            /**
-             * @param string $message
-             *
-             * @return void
-             */
-            public static function assertIsNumeric($actual, $message = '')
-            {
-                static::assertInternalType('numeric', $actual, $message);
-            }
-
-            /**
-             * @param string $message
-             *
-             * @return void
-             */
-            public static function assertIsObject($actual, $message = '')
-            {
-                static::assertInternalType('object', $actual, $message);
-            }
-
-            /**
-             * @param string $message
-             *
-             * @return void
-             */
-            public static function assertIsResource($actual, $message = '')
-            {
-                static::assertInternalType('resource', $actual, $message);
-            }
-
-            /**
-             * @param string $message
-             *
-             * @return void
-             */
-            public static function assertIsString($actual, $message = '')
-            {
-                static::assertInternalType('string', $actual, $message);
-            }
-
-            /**
-             * @param string $message
-             *
-             * @return void
-             */
-            public static function assertIsScalar($actual, $message = '')
-            {
-                static::assertInternalType('scalar', $actual, $message);
-            }
-
-            /**
-             * @param string $message
-             *
-             * @return void
-             */
-            public static function assertIsCallable($actual, $message = '')
-            {
-                static::assertInternalType('callable', $actual, $message);
-            }
-
-            /**
-             * @param string $message
-             *
-             * @return void
-             */
-            public static function assertIsIterable($actual, $message = '')
-            {
-                static::assertInternalType('iterable', $actual, $message);
-            }
-
-            /**
-             * @param string $needle
-             * @param string $haystack
-             * @param string $message
-             *
-             * @return void
-             */
-            public static function assertStringContainsString($needle, $haystack, $message = '')
-            {
-                $constraint = new StringContains($needle, false);
-                static::assertThat($haystack, $constraint, $message);
-            }
-
-            /**
-             * @param string $needle
-             * @param string $haystack
-             * @param string $message
-             *
-             * @return void
-             */
-            public static function assertStringContainsStringIgnoringCase($needle, $haystack, $message = '')
-            {
-                $constraint = new StringContains($needle, true);
-                static::assertThat($haystack, $constraint, $message);
-            }
-
-            /**
-             * @param string $needle
-             * @param string $haystack
-             * @param string $message
-             *
-             * @return void
-             */
-            public static function assertStringNotContainsString($needle, $haystack, $message = '')
-            {
-                $constraint = new LogicalNot(new StringContains($needle, false));
-                static::assertThat($haystack, $constraint, $message);
-            }
-
-            /**
-             * @param string $needle
-             * @param string $haystack
-             * @param string $message
-             *
-             * @return void
-             */
-            public static function assertStringNotContainsStringIgnoringCase($needle, $haystack, $message = '')
-            {
-                $constraint = new LogicalNot(new StringContains($needle, true));
-                static::assertThat($haystack, $constraint, $message);
-            }
-
-            /**
-             * @param string $message
-             *
-             * @return void
-             */
-            public static function assertFinite($actual, $message = '')
-            {
-                static::assertInternalType('float', $actual, $message);
-                static::assertTrue(is_finite($actual), $message ? $message : "Failed asserting that $actual is finite.");
-            }
-
-            /**
-             * @param string $message
-             *
-             * @return void
-             */
-            public static function assertInfinite($actual, $message = '')
-            {
-                static::assertInternalType('float', $actual, $message);
-                static::assertTrue(is_infinite($actual), $message ? $message : "Failed asserting that $actual is infinite.");
-            }
-
-            /**
-             * @param string $message
-             *
-             * @return void
-             */
-            public static function assertNan($actual, $message = '')
-            {
-                static::assertInternalType('float', $actual, $message);
-                static::assertTrue(is_nan($actual), $message ? $message : "Failed asserting that $actual is nan.");
-            }
-
-            /**
-             * @param string $filename
-             * @param string $message
-             *
-             * @return void
-             */
-            public static function assertIsReadable($filename, $message = '')
-            {
-                static::assertInternalType('string', $filename, $message);
-                static::assertTrue(is_readable($filename), $message ? $message : "Failed asserting that $filename is readable.");
-            }
-
-            /**
-             * @param string $filename
-             * @param string $message
-             *
-             * @return void
-             */
-            public static function assertNotIsReadable($filename, $message = '')
-            {
-                static::assertInternalType('string', $filename, $message);
-                static::assertFalse(is_readable($filename), $message ? $message : "Failed asserting that $filename is not readable.");
-            }
-
             /**
              * @param string $filename
              * @param string $message
@@ -224,30 +32,6 @@ public static function assertIsNotReadable($filename, $message = '')
                 static::assertNotIsReadable($filename, $message);
             }
 
-            /**
-             * @param string $filename
-             * @param string $message
-             *
-             * @return void
-             */
-            public static function assertIsWritable($filename, $message = '')
-            {
-                static::assertInternalType('string', $filename, $message);
-                static::assertTrue(is_writable($filename), $message ? $message : "Failed asserting that $filename is writable.");
-            }
-
-            /**
-             * @param string $filename
-             * @param string $message
-             *
-             * @return void
-             */
-            public static function assertNotIsWritable($filename, $message = '')
-            {
-                static::assertInternalType('string', $filename, $message);
-                static::assertFalse(is_writable($filename), $message ? $message : "Failed asserting that $filename is not writable.");
-            }
-
             /**
              * @param string $filename
              * @param string $message
@@ -259,30 +43,6 @@ public static function assertIsNotWritable($filename, $message = '')
                 static::assertNotIsWritable($filename, $message);
             }
 
-            /**
-             * @param string $directory
-             * @param string $message
-             *
-             * @return void
-             */
-            public static function assertDirectoryExists($directory, $message = '')
-            {
-                static::assertInternalType('string', $directory, $message);
-                static::assertTrue(is_dir($directory), $message ? $message : "Failed asserting that $directory exists.");
-            }
-
-            /**
-             * @param string $directory
-             * @param string $message
-             *
-             * @return void
-             */
-            public static function assertDirectoryNotExists($directory, $message = '')
-            {
-                static::assertInternalType('string', $directory, $message);
-                static::assertFalse(is_dir($directory), $message ? $message : "Failed asserting that $directory does not exist.");
-            }
-
             /**
              * @param string $directory
              * @param string $message
@@ -294,30 +54,6 @@ public static function assertDirectoryDoesNotExist($directory, $message = '')
                 static::assertDirectoryNotExists($directory, $message);
             }
 
-            /**
-             * @param string $directory
-             * @param string $message
-             *
-             * @return void
-             */
-            public static function assertDirectoryIsReadable($directory, $message = '')
-            {
-                static::assertDirectoryExists($directory, $message);
-                static::assertIsReadable($directory, $message);
-            }
-
-            /**
-             * @param string $directory
-             * @param string $message
-             *
-             * @return void
-             */
-            public static function assertDirectoryNotIsReadable($directory, $message = '')
-            {
-                static::assertDirectoryExists($directory, $message);
-                static::assertNotIsReadable($directory, $message);
-            }
-
             /**
              * @param string $directory
              * @param string $message
@@ -329,30 +65,6 @@ public static function assertDirectoryIsNotReadable($directory, $message = '')
                 static::assertDirectoryNotIsReadable($directory, $message);
             }
 
-            /**
-             * @param string $directory
-             * @param string $message
-             *
-             * @return void
-             */
-            public static function assertDirectoryIsWritable($directory, $message = '')
-            {
-                static::assertDirectoryExists($directory, $message);
-                static::assertIsWritable($directory, $message);
-            }
-
-            /**
-             * @param string $directory
-             * @param string $message
-             *
-             * @return void
-             */
-            public static function assertDirectoryNotIsWritable($directory, $message = '')
-            {
-                static::assertDirectoryExists($directory, $message);
-                static::assertNotIsWritable($directory, $message);
-            }
-
             /**
              * @param string $directory
              * @param string $message
@@ -364,30 +76,6 @@ public static function assertDirectoryIsNotWritable($directory, $message = '')
                 static::assertDirectoryNotIsWritable($directory, $message);
             }
 
-            /**
-             * @param string $filename
-             * @param string $message
-             *
-             * @return void
-             */
-            public static function assertFileExists($filename, $message = '')
-            {
-                static::assertInternalType('string', $filename, $message);
-                static::assertTrue(file_exists($filename), $message ? $message : "Failed asserting that $filename exists.");
-            }
-
-            /**
-             * @param string $filename
-             * @param string $message
-             *
-             * @return void
-             */
-            public static function assertFileNotExists($filename, $message = '')
-            {
-                static::assertInternalType('string', $filename, $message);
-                static::assertFalse(file_exists($filename), $message ? $message : "Failed asserting that $filename does not exist.");
-            }
-
             /**
              * @param string $filename
              * @param string $message
@@ -399,30 +87,6 @@ public static function assertFileDoesNotExist($filename, $message = '')
                 static::assertFileNotExists($filename, $message);
             }
 
-            /**
-             * @param string $filename
-             * @param string $message
-             *
-             * @return void
-             */
-            public static function assertFileIsReadable($filename, $message = '')
-            {
-                static::assertFileExists($filename, $message);
-                static::assertIsReadable($filename, $message);
-            }
-
-            /**
-             * @param string $filename
-             * @param string $message
-             *
-             * @return void
-             */
-            public static function assertFileNotIsReadable($filename, $message = '')
-            {
-                static::assertFileExists($filename, $message);
-                static::assertNotIsReadable($filename, $message);
-            }
-
             /**
              * @param string $filename
              * @param string $message
@@ -434,30 +98,6 @@ public static function assertFileIsNotReadable($filename, $message = '')
                 static::assertFileNotIsReadable($filename, $message);
             }
 
-            /**
-             * @param string $filename
-             * @param string $message
-             *
-             * @return void
-             */
-            public static function assertFileIsWritable($filename, $message = '')
-            {
-                static::assertFileExists($filename, $message);
-                static::assertIsWritable($filename, $message);
-            }
-
-            /**
-             * @param string $filename
-             * @param string $message
-             *
-             * @return void
-             */
-            public static function assertFileNotIsWritable($filename, $message = '')
-            {
-                static::assertFileExists($filename, $message);
-                static::assertNotIsWritable($filename, $message);
-            }
-
             /**
              * @param string $filename
              * @param string $message
@@ -495,265 +135,3 @@ public static function assertDoesNotMatchRegularExpression($pattern, $string, $m
         }
     }
 }
-
-namespace {
-    foreach (array(
-        'PHPUnit\Framework\Constraint\IsEqual',
-        'PHPUnit\Framework\Constraint\StringContains',
-        'PHPUnit\Framework\Constraint\TraversableContains',
-    ) as $class) {
-        if (!class_exists($class) && class_exists(str_replace('\\', '_', $class))) {
-            class_alias(str_replace('\\', '_', $class), $class);
-        }
-    }
-
-    foreach (array(
-        'PHPUnit\Framework\SelfDescribing',
-    ) as $interface) {
-        if (!interface_exists($interface) && interface_exists(str_replace('\\', '_', $interface))) {
-            class_alias(str_replace('\\', '_', $interface), $interface);
-        }
-    }
-
-    if (!class_exists('PHPUnit\Framework\Constraint\Constraint')) {
-        class_alias('PHPUnit_Framework_Constraint', 'PHPUnit\Framework\Constraint\Constraint');
-    }
-}
-
-// all the code below taken from various PHPUnit versions to make things work on PHPUnit 4.8 / PHP 5.3
-/*
- * This file is part of PHPUnit.
- *
- * (c) Sebastian Bergmann <sebastian@phpunit.de>
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-namespace PHPUnit\Framework\Constraint {
-    use PHPUnit\Framework\ExpectationFailedException;
-
-    if (!class_exists('PHPUnit\Framework\Constraint\RegularExpression')) {
-        /**
-         * Constraint that asserts that the string it is evaluated for matches
-         * a regular expression.
-         *
-         * Checks a given value using the Perl Compatible Regular Expression extension
-         * in PHP. The pattern is matched by executing preg_match().
-         *
-         * The pattern string passed in the constructor.
-         */
-        class RegularExpression extends Constraint
-        {
-            /**
-             * @var string
-             */
-            protected $pattern;
-
-            /**
-             * @param string $pattern
-             */
-            public function __construct($pattern)
-            {
-                parent::__construct();
-                $this->pattern = $pattern;
-            }
-
-            /**
-             * Evaluates the constraint for parameter $other. Returns true if the
-             * constraint is met, false otherwise.
-             *
-             * @param mixed $other Value or object to evaluate.
-             *
-             * @return bool
-             */
-            protected function matches($other)
-            {
-                return \preg_match($this->pattern, $other) > 0;
-            }
-
-            /**
-             * Returns a string representation of the constraint.
-             *
-             * @return string
-             */
-            public function toString()
-            {
-                return \sprintf(
-                    'matches PCRE pattern "%s"',
-                    $this->pattern
-                );
-            }
-        }
-    }
-
-    if (!class_exists('PHPUnit\Framework\Constraint\LogicalNot')) {
-        /**
-         * Logical NOT.
-         */
-        class LogicalNot extends Constraint
-        {
-            /**
-             * @var Constraint
-             */
-            protected $constraint;
-
-            /**
-             * @param Constraint $constraint
-             */
-            public function __construct($constraint)
-            {
-                parent::__construct();
-
-                if (!($constraint instanceof Constraint)) {
-                    $constraint = new IsEqual($constraint);
-                }
-
-                $this->constraint = $constraint;
-            }
-
-            /**
-             * @param string $string
-             *
-             * @return string
-             */
-            public static function negate($string)
-            {
-                $positives = array(
-                    'contains ',
-                    'exists',
-                    'has ',
-                    'is ',
-                    'are ',
-                    'matches ',
-                    'starts with ',
-                    'ends with ',
-                    'reference ',
-                    'not not ',
-                );
-
-                $negatives = array(
-                    'does not contain ',
-                    'does not exist',
-                    'does not have ',
-                    'is not ',
-                    'are not ',
-                    'does not match ',
-                    'starts not with ',
-                    'ends not with ',
-                    'don\'t reference ',
-                    'not ',
-                );
-
-                \preg_match('/(\'[\w\W]*\')([\w\W]*)("[\w\W]*")/i', $string, $matches);
-
-                if (\count($matches) > 0) {
-                    $nonInput = $matches[2];
-
-                    $negatedString = \str_replace(
-                        $nonInput,
-                        \str_replace(
-                            $positives,
-                            $negatives,
-                            $nonInput
-                        ),
-                        $string
-                    );
-                } else {
-                    $negatedString = \str_replace(
-                        $positives,
-                        $negatives,
-                        $string
-                    );
-                }
-
-                return $negatedString;
-            }
-
-            /**
-             * Evaluates the constraint for parameter $other
-             *
-             * If $returnResult is set to false (the default), an exception is thrown
-             * in case of a failure. null is returned otherwise.
-             *
-             * If $returnResult is true, the result of the evaluation is returned as
-             * a boolean value instead: true in case of success, false in case of a
-             * failure.
-             *
-             * @param mixed  $other        Value or object to evaluate.
-             * @param string $description  Additional information about the test
-             * @param bool   $returnResult Whether to return a result or throw an exception
-             *
-             * @throws ExpectationFailedException
-             * @return mixed
-             */
-            public function evaluate($other, $description = '', $returnResult = false)
-            {
-                $success = !$this->constraint->evaluate($other, $description, true);
-
-                if ($returnResult) {
-                    return $success;
-                }
-
-                if (!$success) {
-                    $this->fail($other, $description);
-                }
-            }
-
-            /**
-             * Returns the description of the failure
-             *
-             * The beginning of failure messages is "Failed asserting that" in most
-             * cases. This method should return the second part of that sentence.
-             *
-             * @param mixed $other Evaluated value or object.
-             *
-             * @return string
-             */
-            protected function failureDescription($other)
-            {
-                switch (\get_class($this->constraint)) {
-                    case 'PHPUnit\Framework\Constraint\LogicalAnd':
-                    case 'PHPUnit\Framework\Constraint\LogicalNot':
-                    case 'PHPUnit\Framework\Constraint\LogicalOr':
-                        return 'not( ' . $this->constraint->failureDescription($other) . ' )';
-
-                    default:
-                        return self::negate(
-                            $this->constraint->failureDescription($other)
-                        );
-                }
-            }
-
-            /**
-             * Returns a string representation of the constraint.
-             *
-             * @return string
-             */
-            public function toString()
-            {
-                switch (\get_class($this->constraint)) {
-                    case 'PHPUnit\Framework\Constraint\LogicalAnd':
-                    case 'PHPUnit\Framework\Constraint\LogicalNot':
-                    case 'PHPUnit\Framework\Constraint\LogicalOr':
-                        return 'not( ' . $this->constraint->toString() . ' )';
-
-                    default:
-                        return self::negate(
-                            $this->constraint->toString()
-                        );
-                }
-            }
-
-            /**
-             * Counts the number of constraint elements.
-             *
-             * @return int
-             */
-            public function count()
-            {
-                return \count($this->constraint);
-            }
-        }
-    }
-}
diff --git a/tests/Composer/Test/Repository/ArtifactRepositoryTest.php b/tests/Composer/Test/Repository/ArtifactRepositoryTest.php
index b164a43d66af..49c37a61a175 100644
--- a/tests/Composer/Test/Repository/ArtifactRepositoryTest.php
+++ b/tests/Composer/Test/Repository/ArtifactRepositoryTest.php
@@ -19,7 +19,7 @@
 
 class ArtifactRepositoryTest extends TestCase
 {
-    public function setUp()
+    public function setUp(): void
     {
         parent::setUp();
         if (!extension_loaded('zip')) {
diff --git a/tests/Composer/Test/Repository/FilterRepositoryTest.php b/tests/Composer/Test/Repository/FilterRepositoryTest.php
index 930d44e026bf..d18e8a13ea69 100644
--- a/tests/Composer/Test/Repository/FilterRepositoryTest.php
+++ b/tests/Composer/Test/Repository/FilterRepositoryTest.php
@@ -25,7 +25,7 @@ class FilterRepositoryTest extends TestCase
      */
     private $arrayRepo;
 
-    public function setUp()
+    public function setUp(): void
     {
         $this->arrayRepo = new ArrayRepository();
         $this->arrayRepo->addPackage($this->getPackage('foo/aaa', '1.0.0'));
diff --git a/tests/Composer/Test/Repository/RepositoryManagerTest.php b/tests/Composer/Test/Repository/RepositoryManagerTest.php
index a7f07c85a7ca..6a7df6be8a18 100644
--- a/tests/Composer/Test/Repository/RepositoryManagerTest.php
+++ b/tests/Composer/Test/Repository/RepositoryManagerTest.php
@@ -21,12 +21,12 @@ class RepositoryManagerTest extends TestCase
     /** @var string */
     protected $tmpdir;
 
-    public function setUp()
+    public function setUp(): void
     {
         $this->tmpdir = $this->getUniqueTmpDirectory();
     }
 
-    public function tearDown()
+    public function tearDown(): void
     {
         if (is_dir($this->tmpdir)) {
             $fs = new Filesystem();
diff --git a/tests/Composer/Test/Repository/Vcs/FossilDriverTest.php b/tests/Composer/Test/Repository/Vcs/FossilDriverTest.php
index 501893cbfba7..462047a7b91c 100644
--- a/tests/Composer/Test/Repository/Vcs/FossilDriverTest.php
+++ b/tests/Composer/Test/Repository/Vcs/FossilDriverTest.php
@@ -28,7 +28,7 @@ class FossilDriverTest extends TestCase
      */
     protected $config;
 
-    public function setUp()
+    public function setUp(): void
     {
         $this->home = $this->getUniqueTmpDirectory();
         $this->config = new Config();
@@ -39,7 +39,7 @@ public function setUp()
         ));
     }
 
-    public function tearDown()
+    public function tearDown(): void
     {
         $fs = new Filesystem();
         $fs->removeDirectory($this->home);
diff --git a/tests/Composer/Test/Repository/Vcs/GitBitbucketDriverTest.php b/tests/Composer/Test/Repository/Vcs/GitBitbucketDriverTest.php
index e685b9dfd181..1e11161077af 100644
--- a/tests/Composer/Test/Repository/Vcs/GitBitbucketDriverTest.php
+++ b/tests/Composer/Test/Repository/Vcs/GitBitbucketDriverTest.php
@@ -33,7 +33,7 @@ class GitBitbucketDriverTest extends TestCase
     /** @var string */
     private $home;
 
-    protected function setUp()
+    protected function setUp(): void
     {
         $this->io = $this->getMockBuilder('Composer\IO\IOInterface')->getMock();
 
@@ -51,7 +51,7 @@ protected function setUp()
             ->getMock();
     }
 
-    public function tearDown()
+    public function tearDown(): void
     {
         $fs = new Filesystem;
         $fs->removeDirectory($this->home);
diff --git a/tests/Composer/Test/Repository/Vcs/GitHubDriverTest.php b/tests/Composer/Test/Repository/Vcs/GitHubDriverTest.php
index d48a8fd1c344..6e3728a7a882 100644
--- a/tests/Composer/Test/Repository/Vcs/GitHubDriverTest.php
+++ b/tests/Composer/Test/Repository/Vcs/GitHubDriverTest.php
@@ -28,7 +28,7 @@ class GitHubDriverTest extends TestCase
     /** @var Config */
     private $config;
 
-    public function setUp()
+    public function setUp(): void
     {
         $this->home = $this->getUniqueTmpDirectory();
         $this->config = new Config();
@@ -39,7 +39,7 @@ public function setUp()
         ));
     }
 
-    public function tearDown()
+    public function tearDown(): void
     {
         $fs = new Filesystem;
         $fs->removeDirectory($this->home);
diff --git a/tests/Composer/Test/Repository/Vcs/GitLabDriverTest.php b/tests/Composer/Test/Repository/Vcs/GitLabDriverTest.php
index f06a265267b3..a4c0f3ca34c1 100644
--- a/tests/Composer/Test/Repository/Vcs/GitLabDriverTest.php
+++ b/tests/Composer/Test/Repository/Vcs/GitLabDriverTest.php
@@ -45,7 +45,7 @@ class GitLabDriverTest extends TestCase
      */
     private $httpDownloader;
 
-    public function setUp()
+    public function setUp(): void
     {
         $this->home = $this->getUniqueTmpDirectory();
         $this->config = new Config();
@@ -66,7 +66,7 @@ public function setUp()
         $this->httpDownloader = $this->prophesize('Composer\Util\HttpDownloader');
     }
 
-    public function tearDown()
+    public function tearDown(): void
     {
         $fs = new Filesystem();
         $fs->removeDirectory($this->home);
diff --git a/tests/Composer/Test/Repository/Vcs/HgDriverTest.php b/tests/Composer/Test/Repository/Vcs/HgDriverTest.php
index 2fcd27bdf76c..93c10f27ebad 100644
--- a/tests/Composer/Test/Repository/Vcs/HgDriverTest.php
+++ b/tests/Composer/Test/Repository/Vcs/HgDriverTest.php
@@ -26,7 +26,7 @@ class HgDriverTest extends TestCase
     /** @var string */
     private $home;
 
-    public function setUp()
+    public function setUp(): void
     {
         $this->io = $this->getMockBuilder('Composer\IO\IOInterface')->getMock();
         $this->home = $this->getUniqueTmpDirectory();
@@ -38,7 +38,7 @@ public function setUp()
         ));
     }
 
-    public function tearDown()
+    public function tearDown(): void
     {
         $fs = new Filesystem;
         $fs->removeDirectory($this->home);
diff --git a/tests/Composer/Test/Repository/Vcs/PerforceDriverTest.php b/tests/Composer/Test/Repository/Vcs/PerforceDriverTest.php
index 6dfbc3f26cca..df810bceebd6 100644
--- a/tests/Composer/Test/Repository/Vcs/PerforceDriverTest.php
+++ b/tests/Composer/Test/Repository/Vcs/PerforceDriverTest.php
@@ -61,7 +61,7 @@ class PerforceDriverTest extends TestCase
     const TEST_DEPOT = 'TEST_DEPOT_CONFIG';
     const TEST_BRANCH = 'TEST_BRANCH_CONFIG';
 
-    protected function setUp()
+    protected function setUp(): void
     {
         $this->testPath = $this->getUniqueTmpDirectory();
         $this->config = $this->getTestConfig($this->testPath);
@@ -78,7 +78,7 @@ protected function setUp()
         $this->overrideDriverInternalPerforce($this->perforce);
     }
 
-    protected function tearDown()
+    protected function tearDown(): void
     {
         //cleanup directory under test path
         $fs = new Filesystem;
diff --git a/tests/Composer/Test/Repository/Vcs/SvnDriverTest.php b/tests/Composer/Test/Repository/Vcs/SvnDriverTest.php
index b99658ebf305..e67e275fea9e 100644
--- a/tests/Composer/Test/Repository/Vcs/SvnDriverTest.php
+++ b/tests/Composer/Test/Repository/Vcs/SvnDriverTest.php
@@ -29,7 +29,7 @@ class SvnDriverTest extends TestCase
      */
     protected $config;
 
-    public function setUp()
+    public function setUp(): void
     {
         $this->home = $this->getUniqueTmpDirectory();
         $this->config = new Config();
@@ -40,7 +40,7 @@ public function setUp()
         ));
     }
 
-    public function tearDown()
+    public function tearDown(): void
     {
         $fs = new Filesystem();
         $fs->removeDirectory($this->home);
diff --git a/tests/Composer/Test/Repository/VcsRepositoryTest.php b/tests/Composer/Test/Repository/VcsRepositoryTest.php
index 1e0a541fee4b..470c9bced6b4 100644
--- a/tests/Composer/Test/Repository/VcsRepositoryTest.php
+++ b/tests/Composer/Test/Repository/VcsRepositoryTest.php
@@ -130,7 +130,7 @@ protected function initialize()
         chdir($oldCwd);
     }
 
-    public function setUp()
+    public function setUp(): void
     {
         if (!self::$gitRepo) {
             $this->initialize();
@@ -140,7 +140,7 @@ public function setUp()
         }
     }
 
-    public static function tearDownAfterClass()
+    public static function tearDownAfterClass(): void
     {
         $fs = new Filesystem;
         $fs->removeDirectory(self::$composerHome);
diff --git a/tests/Composer/Test/Util/AuthHelperTest.php b/tests/Composer/Test/Util/AuthHelperTest.php
index d7018cd1ca3d..0129868ebfd8 100644
--- a/tests/Composer/Test/Util/AuthHelperTest.php
+++ b/tests/Composer/Test/Util/AuthHelperTest.php
@@ -31,7 +31,7 @@ class AuthHelperTest extends TestCase
     /** @var AuthHelper */
     private $authHelper;
 
-    protected function setUp()
+    protected function setUp(): void
     {
         $this->io = $this
             ->getMockBuilder('Composer\IO\IOInterface')
diff --git a/tests/Composer/Test/Util/BitbucketTest.php b/tests/Composer/Test/Util/BitbucketTest.php
index 47fdb4ea8f37..eece02ab5bb5 100644
--- a/tests/Composer/Test/Util/BitbucketTest.php
+++ b/tests/Composer/Test/Util/BitbucketTest.php
@@ -48,7 +48,7 @@ class BitbucketTest extends TestCase
     /** @var int */
     private $time;
 
-    protected function setUp()
+    protected function setUp(): void
     {
         $this->io = $this
             ->getMockBuilder('Composer\IO\ConsoleIO')
diff --git a/tests/Composer/Test/Util/ErrorHandlerTest.php b/tests/Composer/Test/Util/ErrorHandlerTest.php
index 551daaa25b7a..45bb198de9b9 100644
--- a/tests/Composer/Test/Util/ErrorHandlerTest.php
+++ b/tests/Composer/Test/Util/ErrorHandlerTest.php
@@ -20,12 +20,12 @@
  */
 class ErrorHandlerTest extends TestCase
 {
-    public function setUp()
+    public function setUp(): void
     {
         ErrorHandler::register();
     }
 
-    public function tearDown()
+    public function tearDown(): void
     {
         restore_error_handler();
     }
diff --git a/tests/Composer/Test/Util/FilesystemTest.php b/tests/Composer/Test/Util/FilesystemTest.php
index bdf6b7f16a8b..fa514cfae33c 100644
--- a/tests/Composer/Test/Util/FilesystemTest.php
+++ b/tests/Composer/Test/Util/FilesystemTest.php
@@ -32,14 +32,14 @@ class FilesystemTest extends TestCase
      */
     private $testFile;
 
-    public function setUp()
+    public function setUp(): void
     {
         $this->fs = new Filesystem;
         $this->workingDir = $this->getUniqueTmpDirectory();
         $this->testFile = $this->getUniqueTmpDirectory() . '/composer_test_file';
     }
 
-    public function tearDown()
+    public function tearDown(): void
     {
         if (is_dir($this->workingDir)) {
             $this->fs->removeDirectory($this->workingDir);
diff --git a/tests/Composer/Test/Util/GitTest.php b/tests/Composer/Test/Util/GitTest.php
index d6e74c7b5b1f..279a15af9a0a 100644
--- a/tests/Composer/Test/Util/GitTest.php
+++ b/tests/Composer/Test/Util/GitTest.php
@@ -32,7 +32,7 @@ class GitTest extends TestCase
     /** @var Filesystem&\PHPUnit\Framework\MockObject\MockObject */
     private $fs;
 
-    protected function setUp()
+    protected function setUp(): void
     {
         $this->io = $this->getMockBuilder('Composer\IO\IOInterface')->getMock();
         $this->config = $this->getMockBuilder('Composer\Config')->disableOriginalConstructor()->getMock();
diff --git a/tests/Composer/Test/Util/Http/ProxyHelperTest.php b/tests/Composer/Test/Util/Http/ProxyHelperTest.php
index 81d1d33a89d5..41ff3fe45093 100644
--- a/tests/Composer/Test/Util/Http/ProxyHelperTest.php
+++ b/tests/Composer/Test/Util/Http/ProxyHelperTest.php
@@ -17,7 +17,7 @@
 
 class ProxyHelperTest extends TestCase
 {
-    protected function setUp()
+    protected function setUp(): void
     {
         unset(
             $_SERVER['HTTP_PROXY'],
@@ -30,7 +30,7 @@ protected function setUp()
         );
     }
 
-    protected function tearDown()
+    protected function tearDown(): void
     {
         unset(
             $_SERVER['HTTP_PROXY'],
diff --git a/tests/Composer/Test/Util/Http/ProxyManagerTest.php b/tests/Composer/Test/Util/Http/ProxyManagerTest.php
index 48e9914df6a8..6cb5d6bf240a 100644
--- a/tests/Composer/Test/Util/Http/ProxyManagerTest.php
+++ b/tests/Composer/Test/Util/Http/ProxyManagerTest.php
@@ -17,7 +17,7 @@
 
 class ProxyManagerTest extends TestCase
 {
-    protected function setUp()
+    protected function setUp(): void
     {
         unset(
             $_SERVER['HTTP_PROXY'],
@@ -31,7 +31,7 @@ protected function setUp()
         ProxyManager::reset();
     }
 
-    protected function tearDown()
+    protected function tearDown(): void
     {
         unset(
             $_SERVER['HTTP_PROXY'],
diff --git a/tests/Composer/Test/Util/IniHelperTest.php b/tests/Composer/Test/Util/IniHelperTest.php
index 0856cd77130b..a6d83bb090e5 100644
--- a/tests/Composer/Test/Util/IniHelperTest.php
+++ b/tests/Composer/Test/Util/IniHelperTest.php
@@ -73,7 +73,7 @@ public function testWithoutLoadedIniAndAdditional()
         $this->assertEquals($paths, IniHelper::getAll());
     }
 
-    public static function setUpBeforeClass()
+    public static function setUpBeforeClass(): void
     {
         // Register our name with XdebugHandler
         $xdebug = new XdebugHandler('composer');
@@ -81,7 +81,7 @@ public static function setUpBeforeClass()
         self::$envOriginal = getenv('COMPOSER_ORIGINAL_INIS');
     }
 
-    public static function tearDownAfterClass()
+    public static function tearDownAfterClass(): void
     {
         // Restore original state
         if (false !== self::$envOriginal) {
diff --git a/tests/Composer/Test/Util/PerforceTest.php b/tests/Composer/Test/Util/PerforceTest.php
index d8743f3d7c54..3f23024df02b 100644
--- a/tests/Composer/Test/Util/PerforceTest.php
+++ b/tests/Composer/Test/Util/PerforceTest.php
@@ -37,7 +37,7 @@ class PerforceTest extends TestCase
     const TEST_PORT = 'port';
     const TEST_PATH = 'path';
 
-    protected function setUp()
+    protected function setUp(): void
     {
         $this->processExecutor = $this->getMockBuilder('Composer\Util\ProcessExecutor')->getMock();
         $this->repoConfig = $this->getTestRepoConfig();
diff --git a/tests/Composer/Test/Util/StreamContextFactoryTest.php b/tests/Composer/Test/Util/StreamContextFactoryTest.php
index 7b2428ec1330..d17b9b7cc13b 100644
--- a/tests/Composer/Test/Util/StreamContextFactoryTest.php
+++ b/tests/Composer/Test/Util/StreamContextFactoryTest.php
@@ -18,13 +18,13 @@
 
 class StreamContextFactoryTest extends TestCase
 {
-    protected function setUp()
+    protected function setUp(): void
     {
         unset($_SERVER['HTTP_PROXY'], $_SERVER['http_proxy'], $_SERVER['HTTPS_PROXY'], $_SERVER['https_proxy'], $_SERVER['NO_PROXY'], $_SERVER['no_proxy']);
         ProxyManager::reset();
     }
 
-    protected function tearDown()
+    protected function tearDown(): void
     {
         unset($_SERVER['HTTP_PROXY'], $_SERVER['http_proxy'], $_SERVER['HTTPS_PROXY'], $_SERVER['https_proxy'], $_SERVER['NO_PROXY'], $_SERVER['no_proxy']);
         ProxyManager::reset();