create tests for switch color on card when light is turned off

[remonh87]

should be sth like this:

testWidgets('should handle having no title', (WidgetTester tester) async {
final Title widget = new Title(
child: new Container(),
color: const Color(0xFF00FF00),
);
expect(widget.toString, isNot(throwsException));
expect(widget.title, equals(''));
expect(widget.color, equals(const Color(0xFF00FF00)));
});