@Test
 public void testLongifyTooLong() {
   System.out.println("longifyTooLong");
   String result;
   try {
     result = ISBNLongifier.longify("9780424058603");
     fail("Should have failed with bad ISBN");
   } catch (IllegalArgumentException e) {
     assertTrue("Caught long ISBN", true);
   }
 }
 @Test
 public void testLongify() {
   System.out.println("longify");
   String isbn = "0802088511";
   String expResult = "9780802088512";
   String result = ISBNLongifier.longify(isbn);
   assertEquals(expResult, result);
   assertEquals("9781555705183", ISBNLongifier.longify("1555705189"));
   assertEquals("9781555705183", ISBNLongifier.longify("1-555-7-05-1-8.9"));
   assertEquals("9780671898540", ISBNLongifier.longify("0-671-89854-X"));
   assertEquals("9780671898540", ISBNLongifier.longify("New 067189854-X (online version"));
   try {
     result = ISBNLongifier.longify("155570518");
     fail("Should have failed with bad ISBN");
   } catch (IllegalArgumentException e) {
     assertTrue("Caught short ISBN", true);
   }
 }