/**
  * @test
  */
 public function setClassMetadataExtensionClassValidateResult()
 {
     $classMetadataExtensionClass = '\\DateTime';
     $result = $this->classMetadata->setClassMetadataExtensionClass($classMetadataExtensionClass);
     $this->assertSame($this->classMetadata, $result);
     $this->assertEquals($classMetadataExtensionClass, $this->classMetadata->getClassMetadataExtensionClass());
 }