unit test with UserManager

Question

Hi!
I am new to ASP.NET Core development and need help.
I'm trying to build a unit test on this method:

public static async Task<bool> LoginExiste(UserManager<Utilisateur> userManager, Utilisateur utilisateur)
        {
            var user = await userManager.FindByNameAsync(utilisateur.UserName);
            if(user != null)
            {
                return true;
            }
            else
            {
                return false;
            }
        }

But I can't seem to build a valid UserManager against my database.
Does anyone have an idea?

Thanks!

Answer 1

You are writing unit tests incorrectly. The concrete implementation of usermanger should never be called in a unit test.

You should be passing a mocked usermanger to the method, because it’s mocked, the unit tests knows what it will return..

Answer 2

This is not my unit test but the method I want to test. Should I modify my method so as not to pass userManager as a parameter?

Answer 3

These are my tries
private Mock<UserManager<Utilisateur>> GetMockUserManager()
{
var userStoreMock = new Mock<IUserStore<Utilisateur>>();
return new Mock<UserManager<Utilisateur>>(
userStoreMock.Object, null, null, null, null, null, null, null, null);
}

        [Test]
        public async Task LoginExisteTest()
        {
            var utilisateur = new Utilisateur();
            utilisateur.UserName = "fball";
            utilisateur.PasswordHash = "test";

            //var options = new DbContextOptionsBuilder<MAuthDbContext>();
            //options.UseSqlServer(@"");


            //var store = new UserStore<Utilisateur>(new MAuthDbContext(new DbContextOptions<MAuthDbContext>()));
            //var userManager = new UserManager<Utilisateur>(store, null, new PasswordHasher<Utilisateur>(), null, null, null, null, null, null);
            //var userManager = MockHelper.TestUserManager(store);



            Mock<UserManager<Utilisateur>> userManager = GetMockUserManager();
            userManager.Setup(x => x.FindByNameAsync(It.IsAny<string>())).ReturnsAsync(utilisateur);
            bool result = await GestionErreur.LoginExiste(null, utilisateur);
            Assert.IsTrue(result);
        }

Answer 4

ok I found the solution

public async Task LoginExisteTest()
        {
            var utilisateur = new Utilisateur();
            utilisateur.UserName = "fball";
            utilisateur.PasswordHash = "test";
            Mock<UserManager<Utilisateur>> userManager = GetMockUserManager();
            userManager.Setup(x => x.FindByNameAsync(It.IsAny<string>())).ReturnsAsync(utilisateur);
            bool result = await GestionErreur.LoginExiste(userManager.Object, utilisateur);
            Assert.IsTrue(result);
        }