@Test
 public void testNegatives() {
   assertEquals(3, jUnitHelloWorld.getNumberOfDigits(-767));
 }
 @Test
 public void testZero() {
   assertEquals(1, jUnitHelloWorld.getNumberOfDigits(0));
 }
 @Test
 public void testMoreThanOneDigit() {
   assertEquals(2, jUnitHelloWorld.getNumberOfDigits(55));
 }