public void test_add_validParameters() {
        TestScriptEngine engine = new TestScriptEngine();
        scriptEngineFactory.add("testEngine", engine);

        // Verify engine is accessible by name
        ScriptEngine retrieved = scriptEngineFactory.getScriptEngine("testengine");
        assertNotNull(retrieved);
        assertEquals(engine, retrieved);

        // Verify engine is accessible by class simple name

        // Setup test script engine
        scriptEngineFactory.add("TestEngine", testScriptEngine);

        // Execute with different case variations
        Object result1 = scriptExecutor.execute("testengine", "script1");
        assertEquals("processed: script1", result1);

        Object result2 = scriptExecutor.execute("TESTENGINE", "script2");
        assertEquals("processed: script2", result2);

        if (keyLength == 16) {
            // AES-128 CCM
            cipher = new CCMBlockCipher(new AESEngine());
        } else if (keyLength == 32) {
            // AES-256 CCM - Bouncy Castle supports AES-256 with same AESEngine
            cipher = new CCMBlockCipher(new AESEngine());
        } else {
            throw new IllegalArgumentException("Unsupported key length for CCM: " + keyLength);
        }