xUnit/Sources/mocks/UTests/UnitTests.cs

using Model;

namespace UTests;

public class UnitTests
{
    [Fact]
    public async Task Test_AddNewNounours_Success()
    {
        //setup the mocks
        MockNounoursStore nounoursStore = new MockNounoursStore(canAdd: true, canRemove: true);
        MockEmailService emailService = new MockEmailService(sendEmail: true);

        //setup the subject-under-test
        NounoursManager mgr = new NounoursManager(nounoursStore, emailService);
        var nounours = new Nounours("chucky.chucky@hell.com");

        //execute the method to test
        await mgr.AddNewNounours(nounours);

        //assert the interactions went correctly
        Assert.Equal(nounours.Email, nounoursStore.AddedNounours?.Email);
        Assert.Equal(nounours.Email, emailService.EmailSentTo);
    }

    [Fact]
    public async Task Test_AddNewNounours_Fail_AlreadyExists()
    {
        //setup the mocks
        MockNounoursStore nounoursStore = new MockNounoursStore(canAdd: false, canRemove: true);
        MockEmailService emailService = new MockEmailService(sendEmail: true);

        //setup the subject-under-test
        NounoursManager mgr = new NounoursManager(nounoursStore, emailService);
        var nounours = new Nounours("chucky.chucky@hell.com");

        //execute the method to test
        await mgr.AddNewNounours(nounours);

        //assert the interactions went correctly
        Assert.Null(nounoursStore.AddedNounours);
        Assert.Null(emailService.EmailSentTo);
    }

    [Fact]
    public async Task Test_AddNewNounours_Fail_BadEmail()
    {
        //setup the mocks
        MockNounoursStore nounoursStore = new MockNounoursStore(canAdd: true, canRemove: true);
        MockEmailService emailService = new MockEmailService(sendEmail: false);

        //setup the subject-under-test
        NounoursManager mgr = new NounoursManager(nounoursStore, emailService);
        var nounours = new Nounours("chucky.chucky@hell.com");

        //execute the method to test
        await mgr.AddNewNounours(nounours);

        //assert the interactions went correctly
        Assert.Null(nounoursStore.AddedNounours);
        Assert.Null(emailService.EmailSentTo);
    }

    [Fact]
    public async Task Test_AddNewNounours_Fail_ExceptionWhenRemoving()
    {
        //setup the mocks
        MockNounoursStore nounoursStore = new MockNounoursStore(canAdd: true, canRemove: false);
        MockEmailService emailService = new MockEmailService(sendEmail: false);

        //setup the subject-under-test
        NounoursManager mgr = new NounoursManager(nounoursStore, emailService);
        var nounours = new Nounours("chucky.chucky@hell.com");

        //assert it throws an exception
        _ = await Assert.ThrowsAsync<Exception>(async () => await mgr.AddNewNounours(nounours));

        //assert the interactions went correctly
        Assert.Equal(nounours.Email, nounoursStore.AddedNounours?.Email);
    }
}