diff --git a/composer/Generator/Builder/DrupalDevDependenciesBuilder.php b/composer/Generator/Builder/DrupalDevDependenciesBuilder.php
index 13ad1dc220c..558657c0f04 100644
--- a/composer/Generator/Builder/DrupalDevDependenciesBuilder.php
+++ b/composer/Generator/Builder/DrupalDevDependenciesBuilder.php
@@ -46,7 +46,7 @@ protected function initialPackageMetadata() {
       ],
       "repositories" => [
         "type" => "vcs",
-        "url" => "https://github.com/mdlutz24/MinkBrowserKitDriver.git"
+        "url" => "https://github.com/mdlutz24/MinkBrowserKitDriver.git",
       ],
     ];
   }
diff --git a/core/modules/layout_builder/tests/src/Unit/SectionComponentTest.php b/core/modules/layout_builder/tests/src/Unit/SectionComponentTest.php
index 07364d9ad92..e50fe65e358 100644
--- a/core/modules/layout_builder/tests/src/Unit/SectionComponentTest.php
+++ b/core/modules/layout_builder/tests/src/Unit/SectionComponentTest.php
@@ -39,7 +39,7 @@ public function testToRenderArray() {
         /** @var \Drupal\layout_builder\Event\SectionComponentBuildRenderArrayEvent $event */
         $event = $args[0];
         $event->setBuild(['#markup' => $event->getPlugin()->getPluginId()]);
-        return;
+        return $event;
       });
 
     $layout_plugin = $this->prophesize(LayoutInterface::class);
diff --git a/core/tests/Drupal/Tests/Component/EventDispatcher/ContainerAwareEventDispatcherTest.php b/core/tests/Drupal/Tests/Component/EventDispatcher/ContainerAwareEventDispatcherTest.php
index 89f8f6e8673..138d8574680 100644
--- a/core/tests/Drupal/Tests/Component/EventDispatcher/ContainerAwareEventDispatcherTest.php
+++ b/core/tests/Drupal/Tests/Component/EventDispatcher/ContainerAwareEventDispatcherTest.php
@@ -143,6 +143,8 @@ public function testGetListenersWithServices() {
 
   /**
    * Tests dispatching Symfony events with core's event dispatcher.
+   *
+   * @doesNotPerformAssertions
    */
   public function testSymfonyEventDispatching() {
     $container = new ContainerBuilder();
diff --git a/core/tests/Drupal/Tests/Core/File/MimeTypeGuesserTest.php b/core/tests/Drupal/Tests/Core/File/MimeTypeGuesserTest.php
deleted file mode 100644
index b7222892d8b..00000000000
--- a/core/tests/Drupal/Tests/Core/File/MimeTypeGuesserTest.php
+++ /dev/null
@@ -1,54 +0,0 @@
-<?php
-
-namespace Drupal\Tests\Core\File;
-
-use Drupal\Core\DependencyInjection\ContainerBuilder;
-use Drupal\Core\File\MimeType\MimeTypeGuesser;
-use Drupal\Core\StreamWrapper\StreamWrapperManager;
-use Drupal\Tests\UnitTestCase;
-use Symfony\Component\HttpFoundation\File\MimeType\MimeTypeGuesser as SymfonyMimeTypeGuesser;
-
-/**
- * @coversDefaultClass \Drupal\Core\File\MimeType\MimeTypeGuesser
- * @group DrupalKernel
- */
-class MimeTypeGuesserTest extends UnitTestCase {
-
-  /**
-   * @covers ::registerWithSymfonyGuesser
-   *
-   * @see Symfony\Component\HttpFoundation\File\MimeType\MimeTypeGuesser
-   */
-  public function testSymfonyGuesserRegistration() {
-    // Make the guessers property accessible on Symfony's MimeTypeGuesser.
-    $symfony_guesser = SymfonyMimeTypeGuesser::getInstance();
-    // Test that the Drupal mime type guess is not being used before the
-    // override method is called. It is possible that the test environment does
-    // not support the default guessers.
-    $reflected_guessers = new \ReflectionProperty($symfony_guesser, 'guessers');
-    $reflected_guessers->setAccessible(TRUE);
-    $guessers = $reflected_guessers->getValue($symfony_guesser);
-    if (count($guessers)) {
-      $this->assertNotInstanceOf('Drupal\Core\File\MimeType\MimeTypeGuesser', $guessers[0]);
-    }
-    $container = new ContainerBuilder();
-    $container->set('file.mime_type.guesser', new MimeTypeGuesser(new StreamWrapperManager()));
-    MimeTypeGuesser::registerWithSymfonyGuesser($container);
-    $symfony_guesser = SymfonyMimeTypeGuesser::getInstance();
-    $guessers = $reflected_guessers->getValue($symfony_guesser);
-    $this->assertSame($container->get('file.mime_type.guesser'), $guessers[0]);
-    $this->assertInstanceOf('Drupal\Core\File\MimeType\MimeTypeGuesser', $guessers[0]);
-    $count = count($guessers);
-
-    $container = new ContainerBuilder();
-    $container->set('file.mime_type.guesser', new MimeTypeGuesser(new StreamWrapperManager()));
-    MimeTypeGuesser::registerWithSymfonyGuesser($container);
-    $symfony_guesser = SymfonyMimeTypeGuesser::getInstance();
-    $guessers = $reflected_guessers->getValue($symfony_guesser);
-    $this->assertSame($container->get('file.mime_type.guesser'), $guessers[0]);
-    $this->assertInstanceOf('Drupal\Core\File\MimeType\MimeTypeGuesser', $guessers[0]);
-    $new_count = count($guessers);
-    $this->assertEquals($count, $new_count, 'The count of mime type guessers remains the same after container re-init.');
-  }
-
-}
diff --git a/core/tests/Drupal/Tests/Listeners/DeprecationListenerTrait.php b/core/tests/Drupal/Tests/Listeners/DeprecationListenerTrait.php
index f002e9f1907..9b21589a28f 100644
--- a/core/tests/Drupal/Tests/Listeners/DeprecationListenerTrait.php
+++ b/core/tests/Drupal/Tests/Listeners/DeprecationListenerTrait.php
@@ -137,7 +137,9 @@ public static function getSkippedDeprecations() {
       'Since symfony/dependency-injection 5.1: The signature of method "Symfony\Component\DependencyInjection\Alias::setDeprecated()" requires 3 arguments: "string $package, string $version, string $message", not defining them is deprecated.',
       'Since symfony/dependency-injection 5.1: The signature of method "Symfony\Component\DependencyInjection\Definition::setDeprecated()" requires 3 arguments: "string $package, string $version, string $message", not defining them is deprecated.',
       'Since symfony/http-foundation 5.1: Retrieving a non-string value from "Symfony\Component\HttpFoundation\InputBag::get()" is deprecated, and will throw a "Symfony\Component\HttpFoundation\Exception\BadRequestException" exception in Symfony 6.0, use "Symfony\Component\HttpFoundation\InputBag::all($key)" instead.',
-    ];
+    'Since symfony/http-foundation 5.1: Passing a non-string value as 2nd argument to "Symfony\Component\HttpFoundation\InputBag::get()" is deprecated, pass a string or null instead.',
+      'Since symfony/yaml 5.1: Support for parsing numbers prefixed with 0 as octal numbers. They will be parsed as strings as of 6.0.',
+      ];
   }
 
   /**