assertNotNull(retrievedByClassName);
        assertEquals(testScriptEngine, retrievedByClassName);
    }

    // Test register method with multiple engines
    @Test
    public void test_register_multipleEngines() {
        TestScriptEngine engine1 = new TestScriptEngine("engine1");
        TestScriptEngine engine2 = new TestScriptEngine("engine2");

        engine1.register();
        engine2.register();