@Test
public void testGetAspectRatio() {

  List<Fraction> a = operationHandler.getAspectRatio("4/3,16/9");
  assertEquals(Fraction.getFraction(4, 3), a.get(0));
  assertEquals(Fraction.getFraction(16, 9), a.get(1));
  assertTrue(operationHandler.getAspectRatio("").isEmpty());
}