Mocking the Authentication Provider

Question

I'm trying to Unit test my login method, for that I used below provider

var provider = Substitute.For<Sitecore.Security.Authentication.AuthenticationProvider>();
            provider
                .Login("extranet\[email protected]", "Test@123", false)
                .Returns(true);

and used this in using block.

using(var db = new Sitecore.FakeDb.Db("master"){ new Sitecore.FakeDb.DbItem("home")} )
            using (new Sitecore.Security.Authentication.AuthenticationSwitcher(provider))
            {
                var item = db.GetItem("/sitecore/content/home"); //Here the error throws "User cannot be null"

                var loginResult = Sitecore.Security.Authentication.AuthenticationManager.Login("extranet\[email protected]", "Test@123");
               loginResult.Should().BeTrue();
            }

I'm able to test the sitecore Login method but inside that block the I'm not able to do any activity like DataBase.GetItem() or AuthenticationManager.GetActiveUser() which throws an error saying System.InvalidOperationException: 'User cannot be null.'

Answer 1

For testing authentication using FakeDb you can try next :

    [Theory]
    [AutoDbData]
    public void Login_UserIsNotLoggedIn_ShouldReturnFalse(FakeMembershipUser user, AuthenticationProvider authenticationProvider, AccountRepository repo)
    {
        authenticationProvider.Login(@"somedomain\John", Arg.Any<string>(), Arg.Any<bool>()).Returns(false);

        var context = new FakeSiteContext(new StringDictionary
                                          {
                                              {"domain", "somedomain"}
                                          });
        using (new Switcher<Domain, Domain>(new Domain("somedomain")))
        {
            using (new AuthenticationSwitcher(authenticationProvider))
            {
                var loginResult = repo.Login("John", "somepassword");
                loginResult.Should().BeNull();
            }
        }
    }

More tests you can find at : https://github.com/Sitecore/Habitat/blob/master/src/Feature/Accounts/Tests/AccountsRepositoryTests.cs