public function testSerializeEmbedOneDiscriminatorMap()
 {
     $apple = new EmbeddedApple();
     $apple->setColor('red');
     $fruitBowl = new FruitBowl();
     $fruitBowl->setEmbeddedSingleFruit($apple);
     $correct = ['embeddedSingleFruit' => ['_doctrine_class_name' => 'apple', 'color' => 'red']];
     $array = $this->serializer->toArray($fruitBowl);
     $this->assertEquals($correct, $array);
 }