### Question:
AnonymousMechanism extends AbstractMechanism { @Override public boolean isApplicable(String username, String password, Principal localPrincipal) { return true; }  @Override byte[] getInitialResponse(); @Override byte[] getChallengeResponse(byte[] challenge); @Override int getPriority(); @Override String getName(); @Override boolean isApplicable(String username, String password, Principal localPrincipal);  }### Answer:
@Test public void testIsApplicableWithNoCredentials() { AnonymousMechanism mech = new AnonymousMechanism(); assertTrue("Should be applicable with no credentials", mech.isApplicable(null, null, null)); }
@Test public void testIsNotApplicableWithNoUser() { AnonymousMechanism mech = new AnonymousMechanism(); assertTrue("Should be applicable with no username", mech.isApplicable(null, "pass", null)); }
@Test public void testIsApplicableWithNoPassword() { AnonymousMechanism mech = new AnonymousMechanism(); assertTrue("Should be applicable with no password", mech.isApplicable("user", null, null)); }
@Test public void testIsApplicableWithEmtpyUser() { AnonymousMechanism mech = new AnonymousMechanism(); assertTrue("Should be applicable with empty username", mech.isApplicable("", "pass", null)); }
@Test public void testIsApplicableWithEmtpyPassword() { AnonymousMechanism mech = new AnonymousMechanism(); assertTrue("Should be applicable with empty password", mech.isApplicable("user", "", null)); }
@Test public void testIsApplicableWithEmtpyUserAndPassword() { AnonymousMechanism mech = new AnonymousMechanism(); assertTrue("Should be applicable with empty user and password", mech.isApplicable("", "", null)); }
@Test public void testIsApplicableWithUserAndPassword() { AnonymousMechanism mech = new AnonymousMechanism(); assertTrue("Should be applicable with user and password", mech.isApplicable("user", "password", null)); }
@Test public void testIsApplicableWithUserAndPasswordAndPrincipal() { AnonymousMechanism mech = new AnonymousMechanism(); assertTrue("Should be applicable with user and password and principal", mech.isApplicable("user", "password", new Principal() { @Override public String getName() { return "name"; } })); }