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_Inherited_data_Context_And_Converter_Different_Types_Invalid_Child_Path()
{
var SUT = new Target1();
var child = new Target2(SUT);
var converter = new BoolToNumber();
child.SetBinding("DataContext", new Binding("Item.List[0]"));
child.SetBinding("TargetValue", new Binding("Details_zzz.InfoBoolean", converter: converter)
{
FallbackValue = 10
});
SUT.ChildrenBinders.Add(child);
// With the invalid path (Details_zzz instead of Details), the converter should not be called at all.
// FallbackValue should be used
SUT.DataContext = new SourceLevel0()
{
Item = new SourceLevel1()
{
List = new SourceLevel2[] { new SourceLevel2() }
}
};
Assert.AreEqual(10, child.TargetValue);
Assert.AreEqual(0, converter.ConversionCount);
Assert.AreEqual(null, converter.LastValue);
}
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);
}
public void When_Inherited_data_Context_Sequence_And_Converter()
{
var SUT = new Target1();
var child = new Target2(SUT);
var converter = new OppositeConverter();
child.SetBinding(Target2.DataContextProperty, new Binding("Item.List[0]"));
child.SetBinding("TargetValue", new Binding("Details.Info", converter: converter)
{
FallbackValue = 10
});
SUT.ChildrenBinders.Add(child);
SUT.DataContext = new SourceLevel0();
Assert.AreEqual(10, child.TargetValue);
Assert.AreEqual(0, converter.ConversionCount);
Assert.AreEqual(null, converter.LastValue);
SUT.DataContext = null;
Assert.AreEqual(10, child.TargetValue);
Assert.AreEqual(0, converter.ConversionCount);
Assert.AreEqual(null, converter.LastValue);
SUT.DataContext = new SourceLevel0();
Assert.AreEqual(10, child.TargetValue);
Assert.AreEqual(0, converter.ConversionCount);
Assert.AreEqual(null, converter.LastValue);
SUT.DataContext = null;
Assert.AreEqual(10, child.TargetValue);
Assert.AreEqual(0, converter.ConversionCount);
Assert.AreEqual(null, converter.LastValue);
SUT.DataContext = new SourceLevel0()
{
Item = new SourceLevel1()
{
List = new SourceLevel2[] { new SourceLevel2() }
}
};
Assert.AreEqual(-1000, child.TargetValue);
Assert.AreEqual(1, converter.ConversionCount);
Assert.AreEqual(1000, converter.LastValue);
// It breaks here, when a broken binding would replace a fully functional one.
SUT.DataContext = new SourceLevel0();
Assert.AreEqual(10, child.TargetValue);
Assert.AreEqual(2, converter.ConversionCount);
Assert.AreEqual(null, converter.LastValue);
SUT.DataContext = new SourceLevel0()
{
Item = new SourceLevel1()
{
List = new SourceLevel2[] { new SourceLevel2() }
}
};
Assert.AreEqual(-1000, child.TargetValue);
Assert.AreEqual(3, converter.ConversionCount);
Assert.AreEqual(1000, converter.LastValue);
SUT.DataContext = null;
Assert.AreEqual(10, child.TargetValue);
Assert.AreEqual(4, converter.ConversionCount);
Assert.AreEqual(null, converter.LastValue);
SUT.DataContext = new SourceLevel0()
{
Item = new SourceLevel1()
{
List = new SourceLevel2[] { new SourceLevel2() }
}
};
Assert.AreEqual(-1000, child.TargetValue);
Assert.AreEqual(5, converter.ConversionCount);
Assert.AreEqual(1000, converter.LastValue);
}
