assertNotNull(retrieved);
        assertEquals(engine, retrieved);
    }

    // Test case sensitivity preservation in error messages
    @Test
    public void test_getScriptEngine_errorMessagePreservesCase() {
        try {
            scriptEngineFactory.getScriptEngine("MyNonExistentEngine");
            fail("Should throw ScriptEngineException");
        } catch (ScriptEngineException e) {