minor #59898 replace assertEmpty() with stricter assertions (xabbuh)

This PR was merged into the 7.3 branch.

Discussion
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replace `assertEmpty()` with stricter assertions

| Q             | A
| ------------- | ---
| Branch?       | 7.3
| Bug fix?      | no
| New feature?  | no
| Deprecations? | no
| Issues        |
| License       | MIT

In the code we are strict about not using `empty()`. In my opinion it makes sense to be equally strict with our assertions. But I'd like to gather some feedback first before updating all places.

Commits
-------

6550cb815e3 replace assertEmpty() with stricter assertions

Author: fabpot

Tests/DependencyInjection/FrameworkExtensionTestCase.php

@@ -796,7 +796,7 @@ public function testMessengerServicesRemovedWhenDisabled()
             \ARRAY_FILTER_USE_KEY
         );
 
-        $this->assertEmpty($messengerDefinitions);
+        $this->assertSame([], $messengerDefinitions);
         $this->assertFalse($container->hasDefinition('console.command.messenger_consume_messages'));
         $this->assertFalse($container->hasDefinition('console.command.messenger_debug'));
         $this->assertFalse($container->hasDefinition('console.command.messenger_stop_workers'));
@@ -1941,7 +1941,7 @@ public function testRemovesResourceCheckerConfigCacheFactoryArgumentOnlyIfNoDebu
 
         $container = $this->createContainer(['kernel.debug' => false]);
         (new FrameworkExtension())->load([['annotations' => false, 'http_method_override' => false, 'handle_all_throwables' => true, 'php_errors' => ['log' => true]]], $container);
-        $this->assertEmpty($container->getDefinition('config_cache_factory')->getArguments());
+        $this->assertSame([], $container->getDefinition('config_cache_factory')->getArguments());
     }
 
     public function testLoggerAwareRegistration()

Tests/Functional/ApiAttributesTest.php

@@ -34,7 +34,7 @@ public function testMapQueryString(string $uri, array $query, string $expectedRe
         if ($expectedResponse) {
             self::assertJsonStringEqualsJsonString($expectedResponse, $response->getContent());
         } else {
-            self::assertEmpty($response->getContent());
+            self::assertSame('', $response->getContent());
         }
         self::assertSame($expectedStatusCode, $response->getStatusCode());
     }