Ensure DataConfiguration links to Normalizers and Serializers

Add assertions to verify that DataConfiguration properly points to the instances of NormalizersConfiguration and SerializersConfiguration. This strengthens the test coverage and ensures configuration consistency.

Author: Fa-BRAIK

tests/Unit/DataConfigurationTest.php

@@ -26,6 +26,12 @@ public function it_can_create_an_instance_and_override_it_if_needed(): void
         $config = DataConfiguration::getInstance();
         self::assertInstanceOf(DataConfiguration::class, $config);
 
+        $normalizersConfig = NormalizersConfiguration::getInstance();
+        self::assertSame($config->normalizers, $normalizersConfig);
+
+        $serializersConfig = SerializersConfiguration::getInstance();
+        self::assertSame($config->serializers, $serializersConfig);
+
         $sameConfig = DataConfiguration::getInstance();
         self::assertSame($config, $sameConfig);