public void ClearValueTest()
{
object strokes, new_strokes, rlv_strokes;
InkPresenter ink = new InkPresenter();
// check initial value
strokes = ink.ReadLocalValue(InkPresenter.StrokesProperty);
Assert.AreEqual(DependencyProperty.UnsetValue, strokes, "initial strokes is not set");
// now try ClearValue
ink.ClearValue(InkPresenter.StrokesProperty);
// check that ReadLocalValue returns unset
rlv_strokes = ink.ReadLocalValue(InkPresenter.StrokesProperty);
Assert.AreEqual(DependencyProperty.UnsetValue, rlv_strokes, "ReadLocalValue after ClearValue is unset");
// check that GetValue returns a StrokeCollection
new_strokes = ink.GetValue(InkPresenter.StrokesProperty);
Assert.AreNotEqual(DependencyProperty.UnsetValue, new_strokes, "GetValue after a ClearValue is set");
Assert.IsNotNull(new_strokes as StrokeCollection, "GetValue after a ClearValue does not return null");
// check that ReadLocalValue still returns unset
rlv_strokes = ink.ReadLocalValue(InkPresenter.StrokesProperty);
Assert.AreEqual(DependencyProperty.UnsetValue, rlv_strokes, "ReadLocalValue after a GetValue still returns unset");
// add a stroke
strokes = new_strokes;
((StrokeCollection) strokes).Add(new Stroke());
// check that ReadLocalValue still returns unset
rlv_strokes = ink.ReadLocalValue(InkPresenter.StrokesProperty);
Assert.AreEqual(DependencyProperty.UnsetValue, rlv_strokes, "ReadLocalValue after adding a stroke still returns unset");
// check that GetValue still returns the same StrokeCollection
new_strokes = ink.GetValue(InkPresenter.StrokesProperty);
Assert.AreEqual(strokes, new_strokes, "strokes are the same");
// set the strokes to something
strokes = ink.Strokes = new StrokeCollection();
// check that ReadLocalValue doesn't return unset anymore
rlv_strokes = ink.ReadLocalValue(InkPresenter.StrokesProperty);
Assert.AreEqual(strokes, rlv_strokes, "ReadLocalValue returned the strokes we just set on it");
}
public void ResetValueTest()
{
InkPresenter ink = new InkPresenter();
StrokeCollection strokes;
strokes = ink.GetValue(InkPresenter.StrokesProperty) as StrokeCollection;
// does setting the value to null reset the collection?
strokes.Add(new Stroke());
ink.Strokes = null;
strokes = ink.GetValue(InkPresenter.StrokesProperty) as StrokeCollection;
Assert.AreEqual(0, strokes.Count, "Nulled strokes not empty as expected");
// does clearing the value reset the collection?
strokes.Add(new Stroke());
ink.ClearValue(InkPresenter.StrokesProperty);
strokes = ink.GetValue(InkPresenter.StrokesProperty) as StrokeCollection;
Assert.AreEqual(0, strokes.Count, "Cleared strokes not empty as expected");
}