public void When_Inherited_data_Context_and_Changed()
{
var SUT = new Target1();
var child = new Target2(SUT);
child.SetBinding(Target2.DataContextProperty, new Binding("Child"));
child.SetBinding("TargetValue", new Binding("Value"));
SUT.ChildrenBinders.Add(child);
var source = new MySource();
SUT.DataContext = source;
Assert.AreEqual(42, child.TargetValue);
Assert.AreEqual(1, child.TargetValueSetCount);
Assert.AreEqual(1, SUT.DataContextChangedCount);
Assert.AreEqual(1, child.DataContextChangedCount);
source.Child = new MySource2(44);
Assert.AreEqual(44, child.TargetValue);
Assert.AreEqual(2, child.TargetValueSetCount);
Assert.AreEqual(1, SUT.DataContextChangedCount);
Assert.AreEqual(2, child.DataContextChangedCount);
}
public void When_Direct_data_Context_binding()
{
var SUT = new Target1();
var child = new Target2();
// Bypass the inheritance
child.SetBinding(Target1.DataContextProperty, new Binding("Child"));
child.SetBinding(Target2.TargetValueProperty, new Binding("Value"));
SUT.ChildrenBinders.Add(child);
var source = new MySource();
SUT.DataContext = source;
Assert.AreEqual(42, child.TargetValue);
Assert.AreEqual(1, child.TargetValueSetCount);
}
public void When_Inherited_data_Context_And_Converter()
{
var SUT = new Target1();
var child = new Target2(SUT);
child.SetBinding(Target2.DataContextProperty, new Binding("Child"));
child.SetBinding("TargetValue", new Binding("Value", converter: new OppositeConverter()));
SUT.ChildrenBinders.Add(child);
var source = new MySource();
SUT.DataContext = source;
Assert.AreEqual(-42, child.TargetValue);
Assert.AreEqual(1, child.TargetValueSetCount);
source.Child = new MySource2(43);
Assert.AreEqual(-43, child.TargetValue);
Assert.AreEqual(2, child.TargetValueSetCount);
}