/** Test of hashCode method, of class Mail. */
 @Test
 public void testHashCode() {
   System.out.println("hashCode");
   Mail instance = new Mail();
   int expResult = 0;
   int result = instance.hashCode();
   assertEquals(expResult, result);
   // TODO review the generated test code and remove the default call to fail.
   fail("The test case is a prototype.");
 }