public void Authenticate_ExistingUser() { var email = "*****@*****.**"; var loginDto = new LoginDto { Email = email }; _unitOfWorkMock.Setup(uof => uof.FacultyGenericRepository.Find(null)); var user = new IdentityUser() { Email = email }; var claim = new ClaimsIdentity() { Label = email }; var userStore = Mock.Of <IUserStore <IdentityUser> >(); var userManager = new Mock <ApplicationUserManager>(userStore); userManager.Setup(_ => _.FindAsync(email, It.IsAny <string>())).Returns(Task.FromResult(user)); userManager.Setup(_ => _.CreateIdentityAsync(user, DefaultAuthenticationTypes.ApplicationCookie)).Returns(Task.FromResult(claim)); _unitOfWorkMock.SetupGet(uof => uof.UserManager).Returns(userManager.Object); var actual = _sut.Authenticate(loginDto); Assert.Equal(email, actual.Result.Label); }