LehrerApp/LehrerApp.Desktop.Tests/ExamGradingDialogViewModelTests.cs

using LehrerApp.Core.Models;
using LehrerApp.Core.Services;
using LehrerApp.Desktop.ViewModels.Groups;
using Xunit;

namespace LehrerApp.Desktop.Tests;

/// Deckt 1.6.3 (Bulk-Aktion "Rest als abwesend markieren") ab — löst das Nutzer-Feedback, dass
/// Schüler, die nie nachschreiben, sonst dauerhaft eine leere, unberührte Zeile hinterlassen.
public sealed class ExamGradingDialogViewModelTests
{
    [Fact]
    public void MarkRemainingAbsent_MarktNurUnberührteZeilenAbwesend()
    {
        var group = new LearningGroup { Name = "Q1 Chemie" };
        var studentWithPoints = new Student { FirstName = "Anna", LastName = "Bauer" };
        var untouchedStudent1 = new Student { FirstName = "Ben", LastName = "Cordes" };
        var untouchedStudent2 = new Student { FirstName = "Cara", LastName = "Diehl" };
        var students = new FakeStudents([studentWithPoints, untouchedStudent1, untouchedStudent2]);
        var memberships = new FakeMemberships(
        [
            new GroupMembership { GroupId = group.Id, StudentId = studentWithPoints.Id },
            new GroupMembership { GroupId = group.Id, StudentId = untouchedStudent1.Id },
            new GroupMembership { GroupId = group.Id, StudentId = untouchedStudent2.Id },
        ]);
        var exam = new Exam
        {
            GroupId = group.Id,
            Title = "Klausur 1",
            Tasks = [new ExamTask { Nr = 1, MaxPoints = 10 }],
            GradingKey = GradingService.DefaultKey1To6(),
        };
        var results = new FakeResults();

        var vm = new ExamGradingDialogViewModel(results, students, memberships,
            new GradingService(), exam, group.Id);

        var rowWithPoints = vm.Rows.Single(r => r.StudentId == studentWithPoints.Id);
        rowWithPoints.Cells[0].TrySetValue(7);

        vm.MarkRemainingAbsentCommand.Execute(null);

        Assert.False(rowWithPoints.Absent);
        Assert.True(vm.Rows.Single(r => r.StudentId == untouchedStudent1.Id).Absent);
        Assert.True(vm.Rows.Single(r => r.StudentId == untouchedStudent2.Id).Absent);
    }

    [Fact]
    public void MarkRemainingAbsent_LässtBereitsAbwesendMarkierteUnverändert()
    {
        var group = new LearningGroup { Name = "Q1 Chemie" };
        var student = new Student { FirstName = "Ben", LastName = "Cordes" };
        var students = new FakeStudents([student]);
        var memberships = new FakeMemberships(
            [new GroupMembership { GroupId = group.Id, StudentId = student.Id }]);
        var exam = new Exam { GroupId = group.Id, Title = "Klausur 1", Tasks = [new ExamTask { Nr = 1, MaxPoints = 10 }], GradingKey = GradingService.DefaultKey1To6() };
        var vm = new ExamGradingDialogViewModel(new FakeResults(), students, memberships,
            new GradingService(), exam, group.Id);

        vm.Rows[0].Absent = true;
        vm.MarkRemainingAbsentCommand.Execute(null);

        Assert.True(vm.Rows[0].Absent);
    }
}