public void Pinching_emits_when_OnPinchingScaleChanged_invoked()
{
var recognizer = new PlatformPinchRecognizerStub(new object());
var pinch = default(PinchEvent);
recognizer.Pinching.Skip(1).Take(1).Subscribe(ev => pinch = ev);
recognizer.OnPinchingBegan(0, 0);
recognizer.OnPinchingScaleChanged(1.5);
pinch.State.Should().Be(GestureState.Changed, "because pinching scale changed");
pinch.Scale.Should().Be(1.5);
}
public void OnPinchingScaleChanged_throws_if_pinch_not_in_progress()
{
var recognizer = new PlatformPinchRecognizerStub(new object());
Assert.Throws <InvalidOperationException>(() => recognizer.OnPinchingScaleChanged(1.5));
}