public void Remove_Fail()
{
var service = GetMockedAnimalService();
service.Setup(x => x.Delete(It.IsAny <Guid>())).Returns(new OperationResult(false, "Fail"));
var controller = new AnimalsController(service.Object);
var result = (OperationResult)controller.Remove(Guid.NewGuid().ToString()).Data;
Assert.IsFalse(result.Success);
Assert.IsNotEmpty(result.Message);
}