MSTest 单元测试控制器

Question

Learning MSTest -- 尝试对 REST 函数进行单元测试：AccountController（我相信它会起作用）我想从 Register 开始.由于某种原因，我无法设置 Mocks。 （起订量已安装）。 另外，我对这怎么可能有用感到困惑。如果我模拟所有控制器输入，我不会得到任何回报？你的建议？

AccountController - 单元测试的目标：

namespace API.Controllers
{
    public class AccountController : BaseApiController
    {
        private readonly UserManager<AppUser> _userManager;
        private readonly SignInManager<AppUser> _signInManager;
        private readonly RoleManager<IdentityRole> _roleManager;
        private readonly ITokenService _tokenService;
        private readonly IMapper _mapper;
        public AccountController(
            UserManager<AppUser> userManager,
            SignInManager<AppUser> signInManager,
            RoleManager<IdentityRole> roleManager,
            ITokenService tokenService,
            IMapper mapper)
        {
            _signInManager = signInManager;
            _roleManager = roleManager;
            _mapper = mapper;
            _tokenService = tokenService;
            _userManager = userManager;
        }

    [HttpPost("register")]
    // [Authorize]
    [Authorize(Roles = "Admin")]
    public async Task<ActionResult<UserDto>> Register(RegisterDto registerDto)
    {
        if (await this.UserExistsAsync(registerDto.Username)) return BadRequest("Username is taken");

        var user = _mapper.Map<AppUser>(registerDto);
        user.UserName = registerDto.Username.ToLower();
        var result = await _userManager.CreateAsync(user, registerDto.Password);

        if (!result.Succeeded) return BadRequest(result.Errors);

        var roleResult = await _userManager.AddToRoleAsync(user, "User");
        if (!roleResult.Succeeded) return BadRequest(result.Errors);

        return new UserDto
        {
            Username = user.UserName,
            Token = await _tokenService.CreateToken(user),
            KnownAs = user.KnownAs
        };
    }

BTW BaseController 很简单：

{
    [ApiController]
    [Route("api/[controller]")]
    public class BaseApiController : ControllerBase
    {      
    }
}

到目前为止的单元测试是：

namespace API.Controllers.Tests
{
    [TestClass()]
    public class AccountControllerTests
    {
        [TestMethod()]
        public async void AccountController_Register()
        {
            var _userManager = new Mock<UserManager<AppUser>>();
            var _signInManager = new Mock<SignInManager<AppUser>>();
            var _roleManager = new Mock<RoleManager<IdentityRole>>();
            ITokenService tokenService;
            IMapper mapper;

            RegisterDto userDto = new RegisterDto()
            {
                Username = "Admin",
                Password = "Secret1234",
                FirstName = "Johnny",
                LastName = "Appleseed",
                Phone1 = "6175551212",
                Phone2 = "",
                KnownAs = "Dude",
                EmailAddress = "Dude@Somewhere.com",
                Question = "ask",
                Answer = "answer",
            };

            AccountController accountController = new AccountController(_userManager, 
                                                    _signInManager, 
                                                    _roleManager, 
                                                    tokenService, 
                                                    mapper);
            await accountController.Register(userDto);

            Assert.Fail(); <<---- this will be replaced obviously
        }

编译器错误如下所示：

其他参数也有类似的错误信息。

您的建议或将我指向一个涵盖 MSTest Mocks 的教程 :-) 提前致谢。

查克

Answer 1

对于Mock<T>，您需要调用.Object 来获取模拟类型

AccountController accountController = 
    new AccountController(_userManager.Object, //<-- NOTE ".Object" on Mock<T>
        _signInManager.Object, 
        _roleManager.Object, 
        tokenService, 
        mapper);

您还需要使用.Setup 设置预期的行为，以便在测试对象被锻炼时模拟行为符合预期。

参考Moq Quickstart 了解如何实际使用该库