public void GetReturnsEmailWhenUserExists() { // Arrange _mockUsersFinderService.Setup(m => m.FindUserEmailById(It.Is <int>(x => x == 1))).Returns(new Maybe <Email>(new Email("*****@*****.**"))); // Act var result = _controller.GetEmail(1); // Assert var email = AssertHelpers.IsOkResult <Email>(result); Assert.AreEqual(new Email("*****@*****.**"), email); }