@Test
public void testGetResolutions() {

  assertTrue(operationHandler.getResolutions("").isEmpty());
  List<Fraction> res = operationHandler.getResolutions("320x240,1280x720, 1920x1080");
  assertEquals(Fraction.getFraction(320, 240), res.get(0));
  assertEquals(Fraction.getFraction(1280, 720), res.get(1));
  assertEquals(Fraction.getFraction(1920, 1080), res.get(2));
}