@Override
 public void checksumsDoesNotMatch() {
   boolean ok = policy.verifyChecksum(notMatchedChecksums);
   Assert.assertFalse(ok, "Policy should fail if checksums don't match");
 }
 @Override
 public void noOriginalChecksum() {
   boolean ok = policy.verifyChecksum(noOriginalChecksum);
   Assert.assertTrue(ok, "Policy should ignore missing original checksums");
 }
 @Override
 public void checksumsMatch() {
   boolean ok = policy.verifyChecksum(matchedChecksums);
   Assert.assertTrue(ok, "Policy should pass if checksums are same");
 }