public void When_Path_Invalid()
{
var SUT = new MyObject();
var sub = new SubObject();
sub.SetBinding(SubObject.MyPropertyProperty, new Binding("B"));
Assert.AreEqual(0, sub.MyProperty);
Assert.AreEqual(0, sub.MyPropertyCounter);
SUT.SubObject = sub;
Assert.AreEqual(0, sub.MyProperty);
Assert.AreEqual(0, sub.MyPropertyCounter);
SUT.DataContext = 42;
Assert.AreEqual(0, sub.MyProperty);
Assert.AreEqual(0, sub.MyPropertyCounter);
SUT.DataContext = new PropagationContext();
Assert.AreEqual(43, sub.MyProperty);
Assert.AreEqual(1, sub.MyPropertyCounter);
}
public void When_Path_Invalid_And_NotifyPropertyChanged()
{
var SUT = new MyObject();
var sub = new SubObject();
sub.SetBinding(SubObject.MyStringPropertyProperty, new Binding("C.D"));
Assert.AreEqual("", sub.MyStringProperty);
Assert.AreEqual(0, sub.MyStringPropertyCounter);
SUT.SubObject = sub;
Assert.AreEqual("", sub.MyStringProperty);
Assert.AreEqual(0, sub.MyStringPropertyCounter);
SUT.DataContext = new PropagationContext2();
Assert.AreEqual("", sub.MyStringProperty);
Assert.AreEqual(0, sub.MyStringPropertyCounter);
SUT.DataContext = new PropagationContext();
Assert.AreEqual("44", sub.MyStringProperty);
// This must be one, even if the original binding was
// set to an invalid property path for PropagationContext2.
Assert.AreEqual(1, sub.MyStringPropertyCounter);
}
public void When_Path_Invalid_And_Fallback_Value_And_Converter()
{
var SUT = new MyObject();
var sub = new SubObject();
sub.SetBinding(SubObject.MyPropertyProperty, new Binding("B")
{
FallbackValue = "21", Converter = new OppositeConverter()
});
Assert.AreEqual(21, sub.MyProperty);
Assert.AreEqual(1, sub.MyPropertyCounter);
SUT.SubObject = sub;
// We are testing that the converter isn't called when using FallbackValue
Assert.AreEqual(21, sub.MyProperty);
Assert.AreEqual(1, sub.MyPropertyCounter);
SUT.DataContext = new PropagationContext();
// We are testing that the converter is called when not using FallbackValue
Assert.AreEqual(-43, sub.MyProperty);
Assert.AreEqual(2, sub.MyPropertyCounter);
}
public void When_DataContext_And_SelfReference()
{
var SUT = new MyObject();
SUT.SelfTest = SUT;
var sub = new SubObject();
sub.SetBinding(SubObject.MyPropertyProperty, new Binding());
SUT.SubObject = sub;
// This should not fail because of a stack overflow.
SUT.DataContext = 42;
Assert.AreEqual(42, sub.MyProperty);
}
public void When_DataContext_Set_After()
{
var SUT = new MyObject();
var sub = new SubObject();
sub.SetBinding(SubObject.MyPropertyProperty, new Binding());
Assert.AreEqual(0, sub.MyProperty);
SUT.SubObject = sub;
Assert.AreEqual(0, sub.MyProperty);
SUT.DataContext = 42;
Assert.AreEqual(42, sub.MyProperty);
}
public void When_DataContext_Set_Before()
{
var SUT = new MyObject();
SUT.DataContext = 42;
var sub = new SubObject();
sub.SetBinding(SubObject.MyPropertyProperty, new Binding());
Assert.AreEqual(0, sub.MyProperty);
SUT.SubObject = sub;
// The behavior of UWP is undefined. The datacontext is pass through unknown means tp
// non-visual elements, to allow binding. But if defined through code, the datacontext
// is not flowing. We're reproducing this behavior here.
Assert.AreEqual(0, sub.MyProperty);
}
public void When_Path_Invalid_And_Fallback_Value()
{
var SUT = new MyObject();
var sub = new SubObject();
sub.SetBinding(SubObject.MyPropertyProperty, new Binding("B")
{
FallbackValue = "21"
});
Assert.AreEqual(21, sub.MyProperty);
Assert.AreEqual(1, sub.MyPropertyCounter);
SUT.SubObject = sub;
Assert.AreEqual(21, sub.MyProperty);
Assert.AreEqual(1, sub.MyPropertyCounter);
SUT.DataContext = new PropagationContext();
Assert.AreEqual(43, sub.MyProperty);
Assert.AreEqual(2, sub.MyPropertyCounter);
}