fixed test

StudiApp/StudiApp.Test.Unit/ViewModelsTests/MarksOverviewViewModelTest.cs

@@ -73,10 +73,8 @@ public class MarksOverviewViewModelTest
     [Test]
     public void OnSelectedSemesterChangedTest()
     {
-        Thread.Sleep(1000); // wait for ContinueWith to finish in constructor (better alternative?)
         vm.SelectedSemester = semester2;
-
-        Thread.Sleep(1000); // wait for ContinueWith to finish in LoadSemesterOverview (better alternative?)
+        
         var actualId = vm.Marks[0].Id;
         var expectedId= semester2Marks[0].Id;
         Assert.That(actualId, Is.EqualTo(expectedId));

StudiApp/StudiApp/ViewModels/MarksOverviewViewModel.cs

@@ -56,29 +56,24 @@ public partial class MarksOverviewViewModel : ObservableObject
         LoadSemesterOverview();
     }
 
-    private void InitializeSemesterData()
+    private async void InitializeSemesterData()
     {
         //CreateMockData(); // TODO: remove this when not needed anymore
-        _semesterRepository.GetAll().ContinueWith(t =>
-        {
-            Semesters = new ObservableCollection<Semester>(t.Result);
-            SelectedSemester = Semesters[0]; // TODO: get actual current semester
-        });
+        var result = await _semesterRepository.GetAll();
+        Semesters = new ObservableCollection<Semester>(result);
+        SelectedSemester = Semesters[0]; // TODO: get actual current 
     }
 
-    private void LoadSemesterOverview()
+    private async void LoadSemesterOverview()
     {
         // TODO: if SelectedSemester is null, show text 'Select a semester'
+        var result = await _courseRepository.GetAll();
+        var semesterCourses = result.Where(c => c.SemesterId == SelectedSemester.Id).ToList();
+        var semesterMarks = GetMarksFromCourses(semesterCourses);
 
-        _courseRepository.GetAll().ContinueWith(t =>
-        {
-            var semesterCourses = t.Result.Where(c => c.SemesterId == SelectedSemester.Id).ToList();
-            var semesterMarks = GetMarksFromCourses(semesterCourses);
-
-            Marks = new ObservableCollection<Mark>(semesterMarks);
-            SemesterEcts = GetObtainedEcts(semesterCourses);
-            SemesterAverageMark = AverageMarkConverter.MarksToAverage(semesterMarks);
-        });
+        Marks = new ObservableCollection<Mark>(semesterMarks);
+        SemesterEcts = GetObtainedEcts(semesterCourses);
+        SemesterAverageMark = AverageMarkConverter.MarksToAverage(semesterMarks);
     }
 
     private void LoadTotalOverview()