void testIsAnonymous() {
        // Given
        when(mockCredentials.isAnonymous()).thenReturn(true);

        // When
        boolean isAnonymous = mockCredentials.isAnonymous();

        // Then
        assertTrue(isAnonymous);
        verify(mockCredentials).isAnonymous();
    }

    @Test
    @DisplayName("Should check for guest credentials")
    void testIsGuest() {

        this.contextLifetime = time;
    }

    /**
     * {@inheritDoc}
     *
     * @see jcifs.smb.CredentialsInternal#isAnonymous()
     */
    @Override
    public boolean isAnonymous() {
        return this.getSubject() == null && super.isAnonymous();
    }

    /**
     * {@inheritDoc}
     *

     */
    String getUserDomain();

    /**
     * Check if these are anonymous credentials.
     * @return whether these are anonymous credentials
     */
    boolean isAnonymous();

    /**
     * Check if these are guest credentials.
     * @return whether these are guest credentials
     */
    boolean isGuest();

    }

    @Test
    void testHasDefaultCredentials_withNonAnonymous() {
        when(mockCredentials.isAnonymous()).thenReturn(false);
        assertTrue(context.hasDefaultCredentials());
    }

    @Test
    void testHasDefaultCredentials_withAnonymous() {
        when(mockCredentials.isAnonymous()).thenReturn(true);
        assertFalse(context.hasDefaultCredentials());
    }

    @Test

        this.configuration = new StaticJAASConfiguration(properties);
    }

    /**
     * {@inheritDoc}
     *
     * @see jcifs.smb.Kerb5Authenticator#isAnonymous()
     */
    @Override
    public boolean isAnonymous() {
        return false;
    }

    /**
     * {@inheritDoc}
     *
     * @see jcifs.smb.NtlmPasswordAuthenticator#isGuest()
     */
    @Override

        assertTrue(guestAuth.isGuest());
        assertFalse(guestAuth.isAnonymous());

        // Test anonymous detection
        NtlmPasswordAuthenticator anonAuth = new NtlmPasswordAuthenticator("", new char[0]);
        assertTrue(anonAuth.isAnonymous());
        assertFalse(anonAuth.isGuest());

        // Test user authentication

     *
     * @see jcifs.CIFSContext#hasDefaultCredentials()
     */
    @Override
    public boolean hasDefaultCredentials() {
        return this.getDefaultCredentials() != null && !this.getDefaultCredentials().isAnonymous();
    }

    /**
     * Gets the default credentials for this context.
     *
     * @return the default credentials for this context
     */
    protected abstract Credentials getDefaultCredentials();

        // Assert
        assertNotSame(creds, copy, "clone must return a new instance");
        assertEquals(creds.getUserDomain(), copy.getUserDomain());
        assertEquals(creds.isAnonymous(), copy.isAnonymous());
        assertEquals(creds.isGuest(), copy.isGuest());
        assertSame(subject, copy.getSubject(), "subject is the same reference in clone");
    }

    @Test

            // no-op for tests
        }

        @Override
        public boolean isGuest() {
            return false; // not guest for test purposes
        }

        @Override
        public boolean isAnonymous() {
            return false; // not anonymous for test purposes
        }

        @Override
        public String getUserDomain() {
            return "TESTDOMAIN"; // test domain for test purposes
        }

        // Different type -> false
        assertFalse(a.equals("not-an-auth"));
    }

    @Test
    @DisplayName("isAnonymous: depends on subject presence and super")
    void isAnonymous_behaviour() {
        Kerb5Authenticator anon = new Kerb5Authenticator((Subject) null);
        assertTrue(anon.isAnonymous(), "Null subject with default super should be anonymous");