public void TestVariableViewModel()
{
var viewmodel = new VariableViewModel(variableService);
ObservableCollection <Variable> expectedData = new ObservableCollection <Variable>(variableService.All());
var variable = variableService.Find(1);
viewmodel.SelectedVariable = variable;
Assert.AreEqual(expectedData.Count, viewmodel.Variables.Count);
Assert.IsNotNull(viewmodel.SelectedVariable);
Assert.AreEqual(1, viewmodel.SelectedVariable.Variable_id);
}