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
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6550cb815e3 replace assertEmpty() with stricter assertions

Author: fabpot

Tests/Store/DoctrineDbalStoreTest.php

@@ -300,6 +300,6 @@ public function testConfigureSchemaTableExists()
         $someFunction = fn () => true;
         $dbalStore->configureSchema($schema, $someFunction);
         $table = $schema->getTable('lock_keys');
-        $this->assertEmpty($table->getColumns(), 'The table was not overwritten');
+        $this->assertSame([], $table->getColumns(), 'The table was not overwritten');
     }
 }