public void Compass_Changed_Should_Update_Aspect(double heading, string expectedAspect)
{
var compassMock = new Mock <ICompassSensor>();
var compassViewModel = new CompassViewModel(compassMock.Object);
compassViewModel.OnAppearing();
compassMock.Raise(c => c.ReadingChanged += null, new CompassChangedEventArgs(new CompassData(heading)));
Assert.AreEqual(expectedAspect, compassViewModel.CurrentAspect);
Assert.AreEqual(heading, compassViewModel.CurrentHeading);
}
