public void FindPetByIndex_Should_Return_Correct_Pet()
{
Pet petToChoose = new Pet();
sut.AddPet(petToChoose);
int myPetIndex = sut.ShelterList.IndexOf(petToChoose);
Pet returnedFromList = sut.FindPetByIndex(myPetIndex);
Assert.True(petToChoose.Equals(returnedFromList));
}