public void CanReturnNullWhenTryingToDequeueFromEmptyQueue()
{
// Arrange
AnimalNode <string> preference = new AnimalNode <string>("cat");
AnimalShelter <string> animalShelter = new AnimalShelter <string>();
// Act
AnimalNode <string> dequeuedAnimal = animalShelter.DequeueAnimal(preference);
// Assert
Assert.Null(dequeuedAnimal);
}
public void CanReturnPreferredAnimal()
{
// Arrange
AnimalNode <string> catPreference = new AnimalNode <string>("cat");
AnimalShelter <string> animalShelter = new AnimalShelter <string>(catPreference);
// Act
AnimalNode <string> dequeuedAnimal = animalShelter.DequeueAnimal(catPreference);
// Assert
Assert.Equal("cat", dequeuedAnimal.Value);
}
public void CanReturnNullIfNeitherDogNorCatPassedInAsPreferredAnimal()
{
// Arrange
AnimalNode <string> badPreference = new AnimalNode <string>("bird");
AnimalNode <string> legitPreference = new AnimalNode <string>("cat");
AnimalShelter <string> animalShelter = new AnimalShelter <string>();
animalShelter.EnqueueAnimal(legitPreference);
// Act
AnimalNode <string> dequeuedAnimal = animalShelter.DequeueAnimal(badPreference);
// Assert
Assert.Null(dequeuedAnimal);
}
