Unit test project - NUnit reference, throw exception

Question

I have unit test project and I wrote one test to check one functionality:

[Test] public async Task should_not_be_able_register_user_when_user_with_given_name_already_exists() { var mockUserRepository = new Mock<IUserRepository>(); var userService = new UserService(mockUserRepository.Object); mockUserRepository.Setup(x => x.AddAsync(user)); await userService.RegisterAsync("user", "userLastName", "fakeuser", "[email protected]", "123456789"); }

In this test I want to check when user exist throw my defined exception but I have problems.

When I invoke await userService.RegisterAsync... how write assert ?

Assert.Throws(() => what should be here ?

My code: RegisterAsync looks like:

public async Task RegisterAsync(string firstName, string lastName, string username, string email, string phoneNumber) { var user = await _userRepository.GetAsync(username); if (user != null) { throw new CoreException(ErrorCode.UsernameExist, $"Username {user.Username} already exist."); } user = new User(firstName, lastName, username, email, phoneNumber); await _userRepository.AddAsync(user); }

GetAsync:

public async Task<User> GetAsync(string username) => await _context.Users.SingleOrDefaultAsync(x => x.Username == username);

You should only be asking one question per post.

DavidG
– DavidG

2021-03-03 14:47:22 +00:00
Commented Mar 3, 2021 at 14:47 — DavidG
– DavidG, Commented Mar 3, 2021 at 14:47

Nkosi · Accepted Answer · 2021-03-03 14:49:23Z

Setup the mock to return a User

//... User user = new User("firstName", "lastName", "username", "email", "phoneNumber"); mockUserRepository .Setup(x => x.GetAsync(It.IsAny<string>())) .ReturnsAsync(() => user); //...

so that

if (user != null) { throw new CoreException(ErrorCode.UsernameExist, $"Username {user.Username} already exist."); }

will cause the subject code to throw the expected error and asserted.

This can all be summarized as

[Test] public async Task should_not_be_able_register_user_when_user_with_given_name_already_exists() { //Arrange var mockUserRepository = new Mock<IUserRepository>(); var userService = new UserService(mockUserRepository.Object); User user = new User("firstName", "lastName", "username", "email", "phoneNumber"); mockUserRepository .Setup(x => x.GetAsync(It.IsAny<string>())) .ReturnsAsync(() => user); //Act Func<Task> act = userService.RegisterAsync("user", "userLastName", "fakeuser", "[email protected]", "123456789"); //Assert CoreException exception = await Assert.ThrowsAsync<CoreException>(act); }

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