public async Task ThrowWhen_User_AlreadyEnrolledApi() { var options = Utils.GetOptions(nameof(ThrowWhen_User_AlreadyEnrolledApi)); var categoryService = new Mock <ICategoryService>().Object; var userService = new Mock <IUserService>(); var userStore = new Mock <IUserStore <User> >(); var userManager = new Mock <UserManager <User> >(userStore.Object, null, null, null, null, null, null, null, null); var contextAccessor = new Mock <IHttpContextAccessor>(); var userPrincipalFactory = new Mock <IUserClaimsPrincipalFactory <User> >().Object; var signManager = new Mock <SignInManager <User> >(userManager.Object, contextAccessor.Object, userPrincipalFactory, null, null, null, null).Object; var context = new Mock <HttpContext>(); contextAccessor.Setup(a => a.HttpContext).Returns(context.Object); using (var arrContext = new PhotoContestContext(options)) { await arrContext.Users.AddRangeAsync(Utils.SeedUsers()); await arrContext.Statuses.AddRangeAsync(Utils.SeedStatuses()); await arrContext.Categories.AddRangeAsync(Utils.SeedCategories()); await arrContext.Photos.AddRangeAsync(Utils.SeedPhotos()); await arrContext.Contests.AddRangeAsync(Utils.SeedContests()); await arrContext.UserContests.AddRangeAsync(Utils.SeedUserContests()); await arrContext.Ranks.AddRangeAsync(Utils.SeedRanks()); await arrContext.Juries.AddRangeAsync(Utils.SeedJuries()); await arrContext.SaveChangesAsync(); var userToEnroll = arrContext.Users.Skip(2).First(); var claims = new List <Claim>() { new Claim(ClaimTypes.NameIdentifier, userToEnroll.UserName.ToString()), }; var identity = new ClaimsIdentity(claims); var claimsPrincipal = new ClaimsPrincipal(identity); contextAccessor.Setup(x => x.HttpContext.User).Returns(claimsPrincipal); userService.Setup(x => x.GetUserByUsernameAsync(It.IsAny <string>())).Returns(Task.FromResult(userToEnroll)); } using (var actContext = new PhotoContestContext(options)) { var contestToEnroll = actContext.Contests.First(); var userToEnroll = actContext.Users.Skip(2).First(); var sut = new ContestService(actContext, contextAccessor.Object, userService.Object, categoryService, userManager.Object, signManager); await Assert.ThrowsExceptionAsync <ArgumentException>(() => sut.EnrollApiAsync(contestToEnroll.Name)); } }