public async Task AllNonAdminsAsync_ShouldReturn_AllUsersThatAreNotAdmins_ExcludingLogged() { var db = GetDatabase(); var mapper = GetMapper(); var userMnager = UserManagerMock.New; var firstUser = new User { Id = "1", UserName = "******" }; var secondUser = new User { Id = "2", UserName = "******" }; var thirdUser = new User { Id = "3", UserName = "******" }; var forthUser = new User { Id = "4", UserName = "******" }; var fifthUser = new User { Id = "5", UserName = "******" }; await db.Users.AddRangeAsync(firstUser, secondUser, thirdUser, forthUser, fifthUser); await db.SaveChangesAsync(); userMnager .Setup(u => u.GetUsersInRoleAsync(It.IsAny <string>())) .ReturnsAsync(new List <User>() { firstUser, secondUser }); var userService = new UsersService(mapper, db, userMnager.Object); //Act var result = await userService.AllNonAdminsAsync("3"); //Assert result .Should() .NotBeNullOrEmpty() .And .HaveCount(2) .And .Match(u => u.ElementAt(0).Id == "4" && u.ElementAt(1).Username == "fifth"); }