public async Task AddUserToRole_UserAuthorizedAndValidUserNameAndValidRoleId_ReturnsOKResult() { //setup _roleManager.Setup(r => r.FindByIdAsync(It.IsAny <string>())).ReturnsAsync( new IdentityRole { Name = "Admin" }); User userInDb = A.User.WithUserName("user1"); _userManagerMock.Setup(u => u.FindByNameAsync("user1")) .ReturnsAsync(userInDb); _userManagerMock.Setup (r => r.IsInRoleAsync(It.IsAny <User>(), It.IsAny <string>())) .ReturnsAsync(false); _userManagerMock.Setup(um => um.AddToRoleAsync(userInDb, "user1")); _httpContext.Setup(d => d.User.Identity.IsAuthenticated).Returns(true); _administrationController.ControllerContext = new ControllerContext { HttpContext = _httpContext.Object }; var resultFromController = await _administrationController.AddUserToRole("string", "user1"); var okResult = resultFromController as OkResult; //Assert okResult.Should().NotBeNull(); okResult.StatusCode.Should().Be(StatusCodes.Status200OK); }