Pick system-level testing from rectorphp#5784

.github/workflows/system_tests.yaml

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+name: System Tests
+
+on:
+    pull_request: null
+
+jobs:
+    system_tests:
+        runs-on: ubuntu-latest
+        strategy:
+            fail-fast: false
+            matrix:
+                php: [ '7.4', '8.0' ]
+
+        name: PHP ${{ matrix.php }} system tests
+        steps:
+            -   uses: actions/checkout@v2
+
+            -   uses: shivammathur/setup-php@v2
+                with:
+                    php-version: ${{ matrix.php }}
+                    coverage: none # disable xdebug, pcov
+
+            -   name: Install dependencies for Rector
+                run: composer install --no-progress --ansi
+
+            # This workflow runs system tests: Use the Rector application from the source
+            # checkout to process "fixture" projects in tests/system-tests
+            # to see if those can be processed successfully
+
+            -   name: Generate Composer autoloaders in fixture directories
+                run: |
+                    for FIXTURE in `find tests/system-tests -mindepth 1 -maxdepth 1 -type d`; do
+                      (cd $FIXTURE; composer install --no-progress --ansi)
+                    done
+
+            -   name: Run system tests
+                run: |
+                    HAS_FAILURES=0
+
+                    for FIXTURE in `find tests/system-tests -mindepth 1 -maxdepth 1 -type d`; do
+                        echo "-----> Running $FIXTURE <-----"
+                        if (cd $FIXTURE; ../../../bin/rector process --dry-run --clear-cache); then
+                            echo "-----> Result: OK <-----"
+                        else
+                            echo "-----> Result: FAILED <-----"
+                            HAS_FAILURES=1
+                        fi
+                    done
+
+                    exit $HAS_FAILURES

tests/system-tests/dont-execute-code/composer.json

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+{
+    "autoload": {
+        "psr-4": {
+            "Symfony\\Component\\Console\\Output\\": "src"
+        }
+    }
+}

tests/system-tests/dont-execute-code/rector.php

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+<?php
+
+declare(strict_types=1);
+
+use Rector\Core\Configuration\Option;
+use Rector\Php74\Rector\Property\TypedPropertyRector;
+use Rector\Set\ValueObject\SetList;
+use Symfony\Component\DependencyInjection\Loader\Configurator\ContainerConfigurator;
+
+return static function (ContainerConfigurator $containerConfigurator): void {
+    $parameters = $containerConfigurator->parameters();
+    $parameters->set(Option::PATHS, [__DIR__.'/src']);
+    $parameters->set(Option::SKIP, [__DIR__.'/vendor']);
+
+    $parameters->set(Option::SETS, [SetList::PHP_53]);
+};
+

tests/system-tests/dont-execute-code/src/OutputInterface.php

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+<?php
+
+namespace Symfony\Component\Console\Output;
+
+use Exception;
+
+throw new Exception('Running code from ' . __FILE__);

tests/system-tests/parse-php7-code/composer.json

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+{
+    "autoload": {
+        "psr-4": {
+            "Foo\\": "src"
+        }
+    }
+}

tests/system-tests/parse-php7-code/rector.php

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+<?php
+
+declare(strict_types=1);
+
+use Rector\Core\Configuration\Option;
+use Rector\Php74\Rector\Property\TypedPropertyRector;
+use Rector\Set\ValueObject\SetList;
+use Symfony\Component\DependencyInjection\Loader\Configurator\ContainerConfigurator;
+
+return static function (ContainerConfigurator $containerConfigurator): void {
+    $parameters = $containerConfigurator->parameters();
+    $parameters->set(Option::PATHS, [__DIR__.'/src']);
+    $parameters->set(Option::SKIP, [__DIR__.'/vendor']);
+
+    $parameters->set(Option::SETS, [SetList::PHP_53]);
+};
+

tests/system-tests/parse-php7-code/src/Foo.php

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+<?php
+
+namespace Foo;
+
+class Foo
+{
+    public function __construct()
+    {
+        $bar = 'baz';
+        print $bar{2};
+    }
+}

tests/system-tests/parse-php8-code/composer.json

@@ -0,0 +1,7 @@
+{
+    "autoload": {
+        "psr-4": {
+            "Foo\\": "src"
+        }
+    }
+}

tests/system-tests/parse-php8-code/rector.php

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+<?php
+
+declare(strict_types=1);
+
+use Rector\Core\Configuration\Option;
+use Rector\Php74\Rector\Property\TypedPropertyRector;
+use Rector\Set\ValueObject\SetList;
+use Symfony\Component\DependencyInjection\Loader\Configurator\ContainerConfigurator;
+
+return static function (ContainerConfigurator $containerConfigurator): void {
+    $parameters = $containerConfigurator->parameters();
+    $parameters->set(Option::PATHS, [__DIR__.'/src']);
+    $parameters->set(Option::SKIP, [__DIR__.'/vendor']);
+
+    $parameters->set(Option::SETS, [SetList::PHP_53]);
+};
+

tests/system-tests/parse-php8-code/src/Foo.php

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+<?php
+
+namespace Foo;
+
+class Foo
+{
+    public function __construct(
+        public string $property = 'value',
+    ) {}
+}