boolean result = authenticationManager.changePassword("testuser", "newpass");

        assertTrue(result);
        assertEquals(1, chain1.changePasswordCallCount);
        assertEquals(1, chain2.changePasswordCallCount);
        assertEquals(1, chain3.changePasswordCallCount);
    }

    // Test changePassword with multiple chains one failure
    @Test
    public void test_changePassword_multipleChains_oneFailure() {