public void Add_Fail()
{
var service = GetMockedAnimalService();
service.Setup(x => x.Add(It.IsAny <AnimalContract>())).Returns(new OperationResult(false, "Fail"));
var controller = new AnimalsController(service.Object);
var result = (OperationResult)controller.Add(new AnimalContract()).Data;
Assert.IsFalse(result.Success);
Assert.IsNotEmpty(result.Message);
}