public void CheckIfStateAndPostcodeIsValidTest() { // Arrange mockAddressManager.Setup(k => k.CheckIfStateAndPostcodeIsValid(It.IsAny <string>(), It.IsAny <string>())).Returns(true); // Act var result = Assert.IsType <OkObjectResult>(addressController.CheckIfStateAndPostcodeIsValid("NSW", "2150")); // Assert Assert.True((bool)result.Value); }