@Test
 public void testFieldWithRandom() {
   fillGameField(16);
   long[] fieldValues = gameField.getArray();
   for (int i = 0; i < 16; i++) {
     assertEquals(fieldValues[i] == 2 || fieldValues[i] == 4, true);
   }
 }
 private void fillGameField(int count) {
   for (int i = 0; i < count; i++) gameField.fillEmptyCell();
 }