public void When_Converted_Value_NotNull()
{
var target = new MyControl();
var viewModel = new ViewModel();
var converter = new IdentityConverter();
var targetNullValue = "this is the targetNullValue";
target.DataContext = viewModel;
target.SetBinding(
MyControl.MyPropertyProperty,
new Windows.UI.Xaml.Data.Binding(nameof(viewModel.NotNullValue))
{
Converter = converter,
TargetNullValue = targetNullValue,
}
);
Assert.AreEqual(viewModel.NotNullValue, target.MyProperty);
Assert.AreEqual(1, converter.ConvertHitCount);
}
public void When_Converted_Value_Null()
{
var target = new MyControl();
var viewModel = new ViewModel();
var converter = new IdentityConverter();
var targetNullValue = "this is the targetNullValue";
target.DataContext = viewModel;
target.SetBinding(
MyControl.MyPropertyProperty,
new Windows.UI.Xaml.Data.Binding(nameof(viewModel.NullValue))
{
Converter = converter,
TargetNullValue = targetNullValue,
}
);
Assert.AreEqual(targetNullValue, target.MyProperty);
Assert.AreEqual(
2,
converter.ConvertHitCount,
"The converted is called first to check whether TargetNullValue should be called, then once more to convert TargetNullValue itself");
}
public void Exit()
{
_idConverter = null;
_converter = null;
}
public void Init()
{
_idConverter = IdentityConverter.Instance;
_converter = new DataConverter(_idConverter);
}