assertEquals(loadedUser, result);
        assertEquals(1, chain.loadCalls.size());
        assertNull(chain.loadCalls.get(0));
    }

    // Test load returning null
    public void test_load_returnsNull() {
        TestAuthenticationChain chain = new TestAuthenticationChain();
        chain.loadResult = null;
        User inputUser = createTestUser("inputuser", "Input User");