public void WhenMemberChainContainsCastingOperator_ThenBuildProperListener()
{
var target = new NotifyingSampleObject();
var listener = new PropertyChangedHelper().BuildListener(target, x => (x.Child as NotifyingSampleObject2).Child, _dummyCallback);
Assert.IsTrue(listener != null);
}
public void WhenMemberChainContainsMethod_ThenThrowNotSupportedExceptionOnBuilding()
{
var target = new NotifyingSampleObject();
Assert.ThrowsException <NotSupportedException>(() =>
{
var listener = new PropertyChangedHelper().BuildListener(target, x => x.SampleMethod().NotNotifyingChild, _dummyCallback);
});
}
public GivenListenerWithTypedCallback()
{
_target = new NotifyingSampleObject()
{
Child = new NotifyingSampleObject()
{
Value = "foo"
}
};
_listener = new PropertyChangedHelper().BuildListener(_target, x => x.Child.Value, (o, n) => {
_assertion.Invoke(o, n);
});
}
public void WhenObservedPropertyChanges_ThenCallbackIsInvoked()
{
bool wasCalled = false;
var target = new NotifyingSampleObject()
{
Child = new NotifyingSampleObject()
{
Value = "foo"
}
};
var listener = new PropertyChangedHelper().BuildListener(target, x => x.Child.Value, () => { wasCalled = true; });
target.Child.Value = "bar";
Assert.IsTrue(wasCalled);
}
public void WhenListenerIsDisposed_ThenCallbackIsNoLongerInvoked()
{
bool wasCalled = false;
var target = new NotifyingSampleObject()
{
Child = new NotifyingSampleObject()
{
Value = "foo"
}
};
var listener = new PropertyChangedHelper().BuildListener(target, x => x.Child.Value, () => wasCalled = true);
listener.Dispose();
target.Child.Value = "bar";
Assert.IsFalse(wasCalled);
}
public void WhenIntermediatePropertyChangesButNoChangeToObservedProperty_ThenCallbackIsNotInvoked()
{
var wasCalled = false;
var target = new NotifyingSampleObject()
{
Child = new NotifyingSampleObject()
{
Value = "foo"
}
};
new PropertyChangedHelper().BuildListener(target, x => x.Child.Value, () => wasCalled = true);
target.Child = new NotifyingSampleObject()
{
Value = "foo"
};
Assert.IsFalse(wasCalled);
}
