public async Task StudentGroupCreatedInStudentsPageTest()
{
var _azureService = new MockAzureService();
var _dialogService = new MockPageDialogService();
var app = new App(_azureService);
var studentsViewModel = new TeacherStudentsPageViewModel(null, _dialogService);
studentsViewModel.OnNavigatingTo(null);
studentsViewModel.ExecuteCreateGroupCommand();
var studentGroupsTable = await _azureService.GetTableAsync <StudentGroup>();
var studentGroups = await studentGroupsTable.ReadAllItemsAsync();
Assert.IsTrue(studentGroups.Count == 3);
}