public void ViewModel_PropertyChanged()
{
/* First, create an instance of the viewmodel */
DummyViewModel testSubject = new DummyViewModel();
/* Set some properties and fixate the test subject */
testSubject.BooleanValue = true;
testSubject.IntegerValue = 42;
testSubject.Fixate();
/* Register handlers */
testSubject.PropertyChanged += this.ReceivePropertyChangedEvent;
testSubject.Messenger.Register <PropertyChangedMessage <bool> >(this, this.ReceivePropertyChangedMessage);
testSubject.Messenger.Register <PropertyChangedMessage <int> >(this, this.ReceivePropertyChangedMessage);
/* Change the first property */
testSubject.BooleanValue = false;
/* Allow for the messenger to process the send-request and the registered action to complete */
int roundtrips = 0;
while (roundtrips < 5 && !testSubject.IsHandledByEvent && !testSubject.IsHandledByMessage)
{
++roundtrips;
Thread.Yield();
}
/* Check if any events or messages where received */
Assert.IsTrue(testSubject.IsHandledByEvent);
Assert.IsTrue(testSubject.IsHandledByMessage);
/* Reset the handled-flags */
testSubject.IsHandledByEvent = false;
testSubject.IsHandledByMessage = false;
/* Change the second property */
testSubject.IntegerValue = 88;
/* Allow for the messenger to process the send-request and the registered action to complete */
roundtrips = 0;
while (roundtrips < 5 && !testSubject.IsHandledByEvent && !testSubject.IsHandledByMessage)
{
++roundtrips;
Thread.Yield();
}
/* Check if any events or messages where received */
Assert.IsTrue(testSubject.IsHandledByEvent);
Assert.IsFalse(testSubject.IsHandledByMessage);
}
