Testabdeckung Kapitel 13.1 (Tests, Fehlerbehandlung)

Vier neue xUnit-Testprojekte (LehrerApp.Tests, .Data.Tests, .Desktop.Tests,
.Sync.Tests) mit zusammen 104 Tests: GradingService, SchoolYearService,
Repositories gegen In-Memory-LiteDB, Mitarbeits-Aggregation (3.2),
Zeugnisnotenberechnung (2.4) und ConflictResolver.

Dabei zwei echte Fehler in der Sync-Schicht gefunden und behoben:
- SyncEvent.EventId fehlte [BsonId], wodurch EventQueue.Acknowledge()
  nie etwas aus der Queue löschte.
- ConflictResolver verglich Zeitstempel unterschiedlicher DateTimeKind
  direkt (LiteDB liefert Local statt Utc zurück), was die Gleichstand-
  Regel außerhalb von UTC+0 verfälschte.

SchoolYearService.CurrentSchoolYear()/RecentSchoolYears() um ein optionales
today-Argument erweitert, um den Schuljahreswechsel deterministisch zu
testen; LiteDbContext um einen Stream-Konstruktor für In-Memory-Tests.
This commit is contained in:
2026-08-13 11:05:06 +02:00
parent a8b8a40b52
commit 273f459119
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using LehrerApp.Core.Interfaces;
using LehrerApp.Core.Models;
namespace LehrerApp.Desktop.Tests;
// Einfache In-Memory-Fakes der Repository-Schnittstellen, damit ViewModel-Tests ohne echte
// LiteDB-Anbindung laufen. Bewusst schlank gehalten: nur was die getesteten ViewModels brauchen.
public class FakeStudents(List<Student> all) : IStudentRepository
{
public Student? GetById(Guid id) => all.FirstOrDefault(s => s.Id == id);
public List<Student> GetAll(bool includeInactive = false) => all;
public List<Student> GetByGroup(Guid groupId) => all;
public void Save(Student student) { }
public void Delete(Guid id) { }
}
public class FakeMemberships(List<GroupMembership> all) : IGroupMembershipRepository
{
public List<GroupMembership> GetByStudent(Guid studentId) => all.Where(m => m.StudentId == studentId).ToList();
public List<GroupMembership> GetByGroup(Guid groupId) => all.Where(m => m.GroupId == groupId).ToList();
public GroupMembership? GetByStudentAndGroup(Guid studentId, Guid groupId) =>
all.FirstOrDefault(m => m.StudentId == studentId && m.GroupId == groupId);
public void Save(GroupMembership membership) { }
public void Delete(Guid id) { }
}
public class FakeSessions(List<ParticipationSession> all) : IParticipationSessionRepository
{
public List<ParticipationSession> GetByGroup(Guid groupId) => all.Where(s => s.GroupId == groupId).ToList();
public ParticipationSession? GetById(Guid id) => all.FirstOrDefault(s => s.Id == id);
public void Save(ParticipationSession session) { }
public void Delete(Guid id) { }
}
public class FakeEntries : IParticipationRepository
{
private readonly List<ParticipationEntry> _all = [];
public void Add(ParticipationEntry e) => _all.Add(e);
public List<ParticipationEntry> GetBySession(Guid sessionId) => _all.Where(e => e.SessionId == sessionId).ToList();
public List<ParticipationEntry> GetByStudent(Guid studentId) => _all.Where(e => e.StudentId == studentId).ToList();
public ParticipationEntry? GetBySessionAndStudent(Guid sessionId, Guid studentId) =>
_all.FirstOrDefault(e => e.SessionId == sessionId && e.StudentId == studentId);
public void Save(ParticipationEntry entry)
{
_all.RemoveAll(e => e.Id == entry.Id);
_all.Add(entry);
}
public void SaveMany(List<ParticipationEntry> entries) { foreach (var e in entries) Save(e); }
public void DeleteBySession(Guid sessionId) => _all.RemoveAll(e => e.SessionId == sessionId);
}
public class FakeAspects : IParticipationAspectRepository
{
public List<ParticipationAspect> GetDefaults() => [];
public List<ParticipationAspect> GetByGroup(Guid groupId) => [];
public void Save(ParticipationAspect aspect) { }
public void Delete(Guid id) { }
}
public class FakeGrades : IGradeRepository
{
private readonly List<Grade> _all = [];
public void Add(Grade g) => _all.Add(g);
public List<Grade> GetByStudentAndGroup(Guid studentId, Guid groupId) =>
_all.Where(g => g.StudentId == studentId && g.GroupId == groupId).ToList();
public List<Grade> GetByGroup(Guid groupId) => _all.Where(g => g.GroupId == groupId).ToList();
public void Save(Grade grade)
{
_all.RemoveAll(g => g.Id == grade.Id);
_all.Add(grade);
}
public void Delete(Guid id) => _all.RemoveAll(g => g.Id == id);
}
public class FakeExams(List<Exam> all) : IExamRepository
{
public Exam? GetById(Guid id) => all.FirstOrDefault(e => e.Id == id);
public List<Exam> GetByGroup(Guid groupId) => all.Where(e => e.GroupId == groupId).ToList();
public void Save(Exam exam) { }
public void Delete(Guid id) { }
}
public class FakeResults : IExamResultRepository
{
private readonly List<ExamResult> _all = [];
// Upsert-Semantik nach ExamId+StudentId, wie der reale unique Index es erzwingt.
public void Add(ExamResult r)
{
_all.RemoveAll(x => x.ExamId == r.ExamId && x.StudentId == r.StudentId);
_all.Add(r);
}
public List<ExamResult> GetByExam(Guid examId) => _all.Where(r => r.ExamId == examId).ToList();
public List<ExamResult> GetByStudent(Guid studentId) => _all.Where(r => r.StudentId == studentId).ToList();
public ExamResult? GetByExamAndStudent(Guid examId, Guid studentId) =>
_all.FirstOrDefault(r => r.ExamId == examId && r.StudentId == studentId);
public void Save(ExamResult result) { }
public void SaveMany(List<ExamResult> results) { }
}
public class FakeSchemes : IGradingSchemeRepository
{
private readonly Dictionary<Guid, GradingScheme> _byGroup = [];
private readonly Dictionary<GroupType, GradingScheme> _byType = [];
public void SetForGroup(Guid groupId, GradingScheme s) => _byGroup[groupId] = s;
public void SetDefault(GroupType type, GradingScheme s) => _byType[type] = s;
public GradingScheme? GetByGroup(Guid groupId) => _byGroup.GetValueOrDefault(groupId);
public GradingScheme? GetDefaultForType(GroupType type) => _byType.GetValueOrDefault(type);
public void Save(GradingScheme scheme) { }
public void Delete(Guid id) { }
}
public class FakeReportGrades : IReportGradeRepository
{
private readonly List<ReportGrade> _all = [];
public int SavedCount { get; private set; }
public List<ReportGrade> GetByGroup(Guid groupId) => _all.Where(r => r.GroupId == groupId).ToList();
public ReportGrade? GetByStudentGroupPeriod(Guid studentId, Guid groupId, string period) =>
_all.FirstOrDefault(r => r.StudentId == studentId && r.GroupId == groupId && r.Period == period);
public void Save(ReportGrade grade)
{
_all.RemoveAll(r => r.Id == grade.Id);
_all.Add(grade);
SavedCount++;
}
public void Delete(Guid id) => _all.RemoveAll(r => r.Id == id);
}
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<Project Sdk="Microsoft.NET.Sdk">
<PropertyGroup>
<TargetFramework>net10.0</TargetFramework>
<IsPackable>false</IsPackable>
<IsTestProject>true</IsTestProject>
</PropertyGroup>
<ItemGroup>
<ProjectReference Include="..\LehrerApp.Desktop\LehrerApp.Desktop.csproj" />
</ItemGroup>
<ItemGroup>
<PackageReference Include="Microsoft.NET.Test.Sdk" />
<PackageReference Include="xunit" />
<PackageReference Include="xunit.runner.visualstudio">
<PrivateAssets>all</PrivateAssets>
<IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
</PackageReference>
</ItemGroup>
</Project>
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using LehrerApp.Core.Models;
using LehrerApp.Core.Services;
using LehrerApp.Desktop.ViewModels.Groups;
using Xunit;
namespace LehrerApp.Desktop.Tests;
/// Tests für die Mitarbeits-Aggregation (3.2): ParticipationGradeDialogViewModel
/// verrechnet die Sitzungsbewertungen eines Zeitraums zu einer Mitarbeitsnote je Schüler.
public class ParticipationGradeAggregationTests
{
private static (ParticipationGradeDialogViewModel Vm, Guid AnnaId, Guid BenId, Guid CoraId, Guid GroupId, FakeGrades Grades)
BuildScenario()
{
var groupId = Guid.NewGuid();
var anna = new Student { Id = Guid.NewGuid(), FirstName = "Anna", LastName = "Beispiel" };
var ben = new Student { Id = Guid.NewGuid(), FirstName = "Ben", LastName = "Muster" };
var cora = new Student { Id = Guid.NewGuid(), FirstName = "Cora", LastName = "Ohne" }; // nie bewertet
var students = new FakeStudents([anna, ben, cora]);
var memberships = new FakeMemberships([]);
var aspects = new FakeAspects();
var sess1 = new ParticipationSession { GroupId = groupId, Date = new DateOnly(2025, 9, 1) };
var sess2 = new ParticipationSession { GroupId = groupId, Date = new DateOnly(2025, 9, 15) };
var sess3 = new ParticipationSession { GroupId = groupId, Date = new DateOnly(2025, 9, 29) };
var sessions = new FakeSessions([sess1, sess2, sess3]);
var entries = new FakeEntries();
// Anna: 1, 0, +2 → steigender Trend, beide Standardaspekte gleich bewertet.
entries.Add(new ParticipationEntry
{
SessionId = sess1.Id, StudentId = anna.Id,
Ratings = [new() { Key = "quality", Value = -1 }, new() { Key = "quantity", Value = -1 }],
});
entries.Add(new ParticipationEntry
{
SessionId = sess2.Id, StudentId = anna.Id,
Ratings = [new() { Key = "quality", Value = 0 }, new() { Key = "quantity", Value = 0 }],
});
entries.Add(new ParticipationEntry
{
SessionId = sess3.Id, StudentId = anna.Id,
Ratings = [new() { Key = "quality", Value = 2 }, new() { Key = "quantity", Value = 2 }],
});
// Ben: nur einmal bewertet.
entries.Add(new ParticipationEntry
{
SessionId = sess1.Id, StudentId = ben.Id,
Ratings = [new() { Key = "quality", Value = 0 }],
});
// Cora: nie bewertet.
var grades = new FakeGrades();
var grading = new GradingService();
var vm = new ParticipationGradeDialogViewModel(sessions, entries, aspects, students, memberships,
grades, grading, groupId, "2025/26", GradingSystem.Grades1To6);
return (vm, anna.Id, ben.Id, cora.Id, groupId, grades);
}
[Fact]
public void Recompute_MittelBerechnungGewichtetAlleSitzungenGleich()
{
var (vm, annaId, _, _, _, _) = BuildScenario();
var anna = vm.Rows.Single(r => r.StudentId == annaId);
Assert.Equal(3, anna.SessionCount);
Assert.Equal((-1.0 + 0.0 + 2.0) / 3.0, double.Parse(anna.AverageDisplay.Replace(',', '.'),
System.Globalization.CultureInfo.InvariantCulture), precision: 2);
}
[Fact]
public void Recompute_NichtBewerteterSchueler_HatKeineNoteStattSchlechterNote()
{
var (vm, _, _, coraId, _, _) = BuildScenario();
var cora = vm.Rows.Single(r => r.StudentId == coraId);
Assert.Equal(0, cora.SessionCount);
Assert.Null(cora.Grade);
Assert.Equal("nicht bewertet", cora.GradeDisplay);
}
[Fact]
public void Recompute_EinzelneBewertung_ErgibtTrotzdemEineNote()
{
var (vm, _, benId, _, _, _) = BuildScenario();
var ben = vm.Rows.Single(r => r.StudentId == benId);
Assert.Equal(1, ben.SessionCount);
Assert.NotNull(ben.Grade);
}
[Fact]
public void Recompute_SteigendeBewertungen_ZeigenAufwaertstrend()
{
var (vm, annaId, _, _, _, _) = BuildScenario();
var anna = vm.Rows.Single(r => r.StudentId == annaId);
Assert.Equal("↑", anna.TrendSymbol);
}
[Fact]
public void AspektGewicht_AufNullGesetzt_NimmtAspektAusDerBerechnungHeraus()
{
var (vm, annaId, _, _, _, _) = BuildScenario();
var quantity = vm.AspectWeights.First(a => a.Key == "quantity");
quantity.Weight = 0;
// Nur noch "quality" zählt: (-1 + 0 + 2) / 3 = 0.33 — identisch zum Gesamtmittel,
// da beide Aspekte bei Anna durchgehend gleich bewertet wurden.
var anna = vm.Rows.Single(r => r.StudentId == annaId);
var average = double.Parse(anna.AverageDisplay.Replace(',', '.'), System.Globalization.CultureInfo.InvariantCulture);
Assert.Equal(1.0 / 3.0, average, precision: 2);
}
[Fact]
public void SelectedPeriod_H1_SchliesstSitzungenAusserhalbAus()
{
var (vm, _, _, _, _, _) = BuildScenario();
vm.SelectedPeriod = vm.PeriodOptions.First(p => p.Period == ParticipationPeriod.H2);
// Alle Testsitzungen liegen im September (H1) -> im H2-Zeitraum bleibt niemand bewertet.
Assert.All(vm.Rows, r => Assert.Equal(0, r.SessionCount));
}
[Fact]
public void Apply_SpeichertEineNoteJeBewertetemSchueler()
{
var (vm, annaId, benId, coraId, groupId, grades) = BuildScenario();
vm.ApplyCommand.Execute(null);
Assert.NotNull(grades.GetByStudentAndGroup(annaId, groupId)
.SingleOrDefault(g => g.Category == GradeCategory.Participation));
Assert.NotNull(grades.GetByStudentAndGroup(benId, groupId)
.SingleOrDefault(g => g.Category == GradeCategory.Participation));
Assert.Empty(grades.GetByStudentAndGroup(coraId, groupId));
}
[Fact]
public void Apply_ZweitesMal_AktualisiertBestehendeNoteStattZuDuplizieren()
{
var (vm, annaId, _, _, groupId, grades) = BuildScenario();
vm.ApplyCommand.Execute(null);
vm.ApplyCommand.Execute(null);
var annaGrades = grades.GetByStudentAndGroup(annaId, groupId)
.Where(g => g.Category == GradeCategory.Participation).ToList();
Assert.Single(annaGrades);
}
}
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using LehrerApp.Core.Models;
using LehrerApp.Core.Services;
using LehrerApp.Desktop.ViewModels.Groups;
using Xunit;
namespace LehrerApp.Desktop.Tests;
/// Tests für die Zeugnisnotenberechnung (2.4): ReportGradeDialogViewModel kombiniert
/// Klausuren, Mitarbeit und sonstige Noten gemäß Gewichtungsschema zu einer Zeugnisnote.
public class ReportGradeCalculationTests
{
private static Guid GroupId { get; } = Guid.NewGuid();
private static Student Anna { get; } = new() { Id = Guid.NewGuid(), FirstName = "Anna", LastName = "Beispiel" };
private static Student Ben { get; } = new() { Id = Guid.NewGuid(), FirstName = "Ben", LastName = "Muster" };
private static ReportGradeDialogViewModel BuildViewModel(
FakeGrades grades, FakeSchemes schemes, FakeReportGrades reportGrades,
FakeExams exams, FakeResults results)
{
var students = new FakeStudents([Anna, Ben]);
var memberships = new FakeMemberships([]);
var grading = new GradingService();
return new ReportGradeDialogViewModel(grades, exams, results, students, memberships,
schemes, reportGrades, grading, GroupId, GroupType.Class, GradingSystem.Grades1To6, "Testgruppe");
}
private static (Exam Exam1, Exam Exam2, FakeExams Exams, FakeResults Results) BuildExams()
{
var exam1 = new Exam { Id = Guid.NewGuid(), GroupId = GroupId, Date = new DateOnly(2025, 9, 10), Title = "K1" };
var exam2 = new Exam { Id = Guid.NewGuid(), GroupId = GroupId, Date = new DateOnly(2025, 9, 24), Title = "K2" };
var exams = new FakeExams([exam1, exam2]);
var results = new FakeResults();
results.Add(new ExamResult { ExamId = exam1.Id, StudentId = Anna.Id, Grade = "2" });
results.Add(new ExamResult { ExamId = exam2.Id, StudentId = Anna.Id, Grade = "4" });
return (exam1, exam2, exams, results);
}
[Fact]
public void CalculatedGrade_KombiniertKlausurenMitarbeitUndSonstigeGemaessSchema()
{
var (_, _, exams, results) = BuildExams();
var grades = new FakeGrades();
grades.Add(new Grade { StudentId = Anna.Id, GroupId = GroupId, Category = GradeCategory.Participation,
Date = new DateOnly(2025, 9, 5), Value = "3", Weight = 1.0 });
grades.Add(new Grade { StudentId = Anna.Id, GroupId = GroupId, Category = GradeCategory.Other,
Date = new DateOnly(2025, 9, 5), Value = "1", Weight = 1.0 });
var schemes = new FakeSchemes();
schemes.SetForGroup(GroupId, new GradingScheme { ExamsPercent = 50, ParticipationPercent = 40, OtherPercent = 10 });
var vm = BuildViewModel(grades, schemes, new FakeReportGrades(), exams, results);
// Klausuren Ø3 (Note 2 und 4), Mitarbeit 3, Sonstige 1 -> (3*50+3*40+1*10)/100 = 2.8 -> kaufmännisch 3
var anna = vm.Rows.Single(r => r.StudentId == Anna.Id);
Assert.Equal("3", anna.CalculatedValue);
}
[Fact]
public void CalculatedGrade_SchuelerOhneJedeNote_ZeigtKeinenWert()
{
var (_, _, exams, results) = BuildExams();
var schemes = new FakeSchemes();
var vm = BuildViewModel(new FakeGrades(), schemes, new FakeReportGrades(), exams, results);
var ben = vm.Rows.Single(r => r.StudentId == Ben.Id);
Assert.Null(ben.CalculatedValue);
Assert.Equal("", ben.CalculatedDisplay);
}
[Fact]
public void ResolveScheme_BevorzugtGruppenspezifischesSchemaVorVoreinstellung()
{
var (_, _, exams, results) = BuildExams();
var grades = new FakeGrades();
var schemes = new FakeSchemes();
schemes.SetForGroup(GroupId, new GradingScheme { ExamsPercent = 100, ParticipationPercent = 0, OtherPercent = 0 });
schemes.SetDefault(GroupType.Class, new GradingScheme { ExamsPercent = 0, ParticipationPercent = 0, OtherPercent = 100 });
var vm = BuildViewModel(grades, schemes, new FakeReportGrades(), exams, results);
// Gruppenspezifisches Schema gewichtet nur Klausuren (Ø3 aus Note 2 und 4) -> exakt "3"
Assert.Contains("Klausuren 100", vm.SchemeSummary);
var anna = vm.Rows.Single(r => r.StudentId == Anna.Id);
Assert.Equal("3", anna.CalculatedValue);
}
[Fact]
public void ResolveScheme_OhneGruppenschema_VerwendetVoreinstellungDesGruppentyps()
{
var (_, _, exams, results) = BuildExams();
var schemes = new FakeSchemes();
schemes.SetDefault(GroupType.Class, new GradingScheme { ExamsPercent = 70, ParticipationPercent = 20, OtherPercent = 10 });
var vm = BuildViewModel(new FakeGrades(), schemes, new FakeReportGrades(), exams, results);
Assert.Contains("Klausuren 70", vm.SchemeSummary);
}
[Fact]
public void ResolveScheme_OhneJedeVoreinstellung_VerwendetHartcodiertenFallback()
{
var (_, _, exams, results) = BuildExams();
var vm = BuildViewModel(new FakeGrades(), new FakeSchemes(), new FakeReportGrades(), exams, results);
Assert.Contains("Klausuren 50", vm.SchemeSummary);
Assert.Contains("Mitarbeit 40", vm.SchemeSummary);
Assert.Contains("Sonstige 10", vm.SchemeSummary);
}
[Fact]
public void Save_UebersteuernOhneBegruendung_LiefertValidierungsfehlerUndSpeichertNicht()
{
var (_, _, exams, results) = BuildExams();
var reportGrades = new FakeReportGrades();
var vm = BuildViewModel(new FakeGrades(), new FakeSchemes(), reportGrades, exams, results);
var anna = vm.Rows.Single(r => r.StudentId == Anna.Id);
anna.OverrideValue = "1";
anna.SaveCommand.Execute(null);
Assert.False(string.IsNullOrEmpty(anna.ValidationMessage));
Assert.Equal(0, reportGrades.SavedCount);
}
[Fact]
public void Save_UebersteuernMitBegruendung_AktualisiertFinalDisplay()
{
var (_, _, exams, results) = BuildExams();
var reportGrades = new FakeReportGrades();
var vm = BuildViewModel(new FakeGrades(), new FakeSchemes(), reportGrades, exams, results);
var anna = vm.Rows.Single(r => r.StudentId == Anna.Id);
anna.OverrideValue = "1";
anna.OverrideReason = "Mündliche Steigerung im letzten Quartal";
anna.SaveCommand.Execute(null);
Assert.True(string.IsNullOrEmpty(anna.ValidationMessage));
Assert.Equal("1", anna.FinalDisplay);
Assert.Equal(1, reportGrades.SavedCount);
}
[Fact]
public void ToggleLock_FriertDenStandEinUndIgnoriertSpaetereNeuberechnung()
{
var (exam1, _, exams, results) = BuildExams();
var reportGrades = new FakeReportGrades();
var vm = BuildViewModel(new FakeGrades(), new FakeSchemes(), reportGrades, exams, results);
var anna = vm.Rows.Single(r => r.StudentId == Anna.Id);
anna.OverrideValue = "1";
anna.OverrideReason = "Testgrund";
anna.SaveCommand.Execute(null);
anna.ToggleLockCommand.Execute(null);
// Neue, bessere Klausurnote nachtragen -> würde die Berechnung ändern, wenn ungesperrt.
results.Add(new ExamResult { ExamId = exam1.Id, StudentId = Anna.Id, Grade = "1" });
vm.SelectedPeriod = vm.PeriodOptions.First(p => p.Period == ParticipationPeriod.H1);
vm.SelectedPeriod = vm.PeriodOptions.First(p => p.Period == ParticipationPeriod.FullYear);
var annaNachSperre = vm.Rows.Single(r => r.StudentId == Anna.Id);
Assert.True(annaNachSperre.IsLocked);
Assert.Equal("1", annaNachSperre.FinalDisplay);
}
[Fact]
public void ExportCsv_EnthaeltAlleSchuelerDerGruppe()
{
var (_, _, exams, results) = BuildExams();
var vm = BuildViewModel(new FakeGrades(), new FakeSchemes(), new FakeReportGrades(), exams, results);
var csv = vm.ExportCsv();
Assert.Contains("Beispiel, Anna", csv);
Assert.Contains("Muster, Ben", csv);
}
[Fact]
public void RoundingRule_Paedagogisch_RundetGrenzfallZurBesserenNote()
{
var exam1 = new Exam { Id = Guid.NewGuid(), GroupId = GroupId, Date = new DateOnly(2025, 9, 10), Title = "K1" };
var exam2 = new Exam { Id = Guid.NewGuid(), GroupId = GroupId, Date = new DateOnly(2025, 9, 24), Title = "K2" };
var exams = new FakeExams([exam1, exam2]);
var results = new FakeResults();
// Ø exakt 2.5 -> kaufmännisch 3, pädagogisch 2 (bessere Note)
results.Add(new ExamResult { ExamId = exam1.Id, StudentId = Anna.Id, Grade = "2" });
results.Add(new ExamResult { ExamId = exam2.Id, StudentId = Anna.Id, Grade = "3" });
var schemes = new FakeSchemes();
schemes.SetForGroup(GroupId, new GradingScheme { ExamsPercent = 100, ParticipationPercent = 0, OtherPercent = 0 });
var vm = BuildViewModel(new FakeGrades(), schemes, new FakeReportGrades(), exams, results);
Assert.Equal("3", vm.Rows.Single(r => r.StudentId == Anna.Id).CalculatedValue);
vm.RoundingRuleName = "Pädagogisch";
Assert.Equal("2", vm.Rows.Single(r => r.StudentId == Anna.Id).CalculatedValue);
}
}