assertEquals("charArrayPassword", retrievedPassword2, "Stored password should not be affected by external changes");
    }

    @Test
    public void testNullPasswordHandling() {
        authenticator = new NtlmPasswordAuthenticator("DOMAIN", "username", (String) null);

        assertNull(authenticator.getPassword(), "getPassword should return null for null password");

        assertEquals(new String(testPassword), auth.getPassword());
    }

    /**
     * Test null password handling
     */
    @Test
    public void testNullPasswordHandling() {
        // Test with null String password
        NtlmPasswordAuthenticator auth1 = new NtlmPasswordAuthenticator("testuser", (String) null);
        assertNull(auth1.getPassword());