minor #32854 Ensure signatures for setUp|tearDown|setUpAfterClass|tea…

…rDownAfterClass methods in tests are compatible with phpunit 8.2 (luispabon)

This PR was squashed before being merged into the 4.3 branch (closes #32854).

Discussion
----------

Ensure signatures for setUp|tearDown|setUpAfterClass|tearDownAfterClass methods in tests are compatible with phpunit 8.2

| Q             | A
| ------------- | ---
| Branch?       | 4.3
| Bug fix?      | no
| New feature?  | yes
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | no
| Fixed tickets | symfony/symfony#32844
| License       | MIT
| Doc PR        | n/a

Please bear with me as this is my first pr to symfony. Branched off 4.3 as requested here: symfony/symfony#32844

Tests currently do not pass due to:

```
PHP Fatal error:  Declaration of Symfony\Bridge\Monolog\Logger::reset() must be compatible with Monolog\Logger::reset(): void in /home/luis/Projects/symfony/src/Symfony/Bridge/Monolog/Logger.php on line 23
```

Commits
-------

97bcb5da50 Ensure signatures for setUp|tearDown|setUpAfterClass|tearDownAfterClass methods in tests are compatible with phpunit 8.2

Tests/Command/CachePoolDeleteCommandTest.php

@@ -23,7 +23,7 @@ class CachePoolDeleteCommandTest extends TestCase
 {
     private $cachePool;
 
-    protected function setUp()
+    protected function setUp(): void
     {
         $this->cachePool = $this->getMockBuilder(CacheItemPoolInterface::class)
             ->getMock();

Tests/Command/XliffLintCommandTest.php

@@ -131,13 +131,13 @@ private function getKernelAwareApplicationMock()
         return $application;
     }
 
-    protected function setUp()
+    protected function setUp(): void
     {
         @mkdir(sys_get_temp_dir().'/xliff-lint-test');
         $this->files = [];
     }
 
-    protected function tearDown()
+    protected function tearDown(): void
     {
         foreach ($this->files as $file) {
             if (file_exists($file)) {

Tests/Functional/CachePoolListCommandTest.php

@@ -20,7 +20,7 @@
  */
 class CachePoolListCommandTest extends AbstractWebTestCase
 {
-    protected function setUp()
+    protected function setUp(): void
     {
         static::bootKernel(['test_case' => 'CachePools', 'root_config' => 'config.yml']);
     }

Tests/Functional/RouterDebugCommandTest.php

@@ -21,7 +21,7 @@ class RouterDebugCommandTest extends AbstractWebTestCase
 {
     private $application;
 
-    protected function setUp()
+    protected function setUp(): void
     {
         $kernel = static::createKernel(['test_case' => 'RouterDebug', 'root_config' => 'config.yml']);
         $this->application = new Application($kernel);

Tests/Functional/TranslationDebugCommandTest.php

@@ -21,7 +21,7 @@ class TranslationDebugCommandTest extends AbstractWebTestCase
 {
     private $application;
 
-    protected function setUp()
+    protected function setUp(): void
     {
         $kernel = static::createKernel(['test_case' => 'TransDebug', 'root_config' => 'config.yml']);
         $this->application = new Application($kernel);