assertEquals("Load failed", e.getMessage());
        }

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

    // Test implementation state tracking
    @Test
    public void test_implementation_stateTracking() {
        TestAuthenticationChain chain = new TestAuthenticationChain();
        User user1 = createTestUser("user1", "User One");
        User user2 = createTestUser("user2", "User Two");