assertSame(invertibleCryptographer, invertibles[i]);
            assertSame(oneWayCryptographer, oneWays[i]);
        }
    }

    // Test with multiple providers
    public void test_multipleProviders() {
        // Test that multiple providers can coexist independently
        InvertibleCryptographer inver1 = InvertibleCryptographer.createAesCipher("key1key1key1key1");