public function testNormalizationLink()
 {
     $this->assertFalse($this->attributeMetadata->isNormalizationLink());
     $newAttributeMetadata = $this->attributeMetadata->withNormalizationLink(true);
     $this->assertTrue($newAttributeMetadata->isNormalizationLink());
     $this->assertNotEquals($this->attributeMetadata, $newAttributeMetadata);
 }