public void ColorScheme_Method() { Assert.Throws <ArgumentNullException>(() => IFacebookLikeBoxWidgetExtensions.ColorScheme(null, FacebookColorScheme.Dark)); Assert.Equal("dark", new FacebookLikeBoxWidget().ColorScheme(FacebookColorScheme.Dark).ColorScheme()); Assert.Equal("light", new FacebookLikeBoxWidget().ColorScheme(FacebookColorScheme.Light).ColorScheme()); }