public void Pause_ClickTest() { Player_Accessor target = new Player_Accessor(); object sender = new Button(); RoutedEventArgs e = null; Assert.IsTrue(target._pausePlayTicker is ManualResetEvent); target._pausePlayTicker = null; Assert.AreEqual(null, target._pausePlayTicker); target.Pause_Click(sender, e); Assert.IsTrue(target._pausePlayTicker is ManualResetEvent); }