assertEquals("Change password failed", e.getMessage());
        }

        assertEquals(1, chain.changePasswordCalls.size());
    }

    // Test load with existing user
    public void test_load_existingUser() {
        TestAuthenticationChain chain = new TestAuthenticationChain();
        User inputUser = createTestUser("inputuser", "Input User");
        User loadedUser = createTestUser("loadeduser", "Loaded User");