// Test constructor with null message
        ScriptEngineException exception = new ScriptEngineException(null);

        assertNull(exception.getMessage());
        assertNull(exception.getCause());
    }

    public void test_constructor_withNullMessageAndCause() {
        // Test constructor with null message and null cause
        ScriptEngineException exception = new ScriptEngineException(null, null);

        // Try to execute with non-existent script type
        try {
            scriptExecutor.execute("nonexistent", "some script");
            fail("Expected ScriptEngineException");
        } catch (ScriptEngineException e) {
            assertTrue(e.getMessage().contains("nonexistent"));
        }
    }

    public void test_execute_withNullScriptType() {
        // Try to execute with null script type

    public void test_getScriptEngine_nullName() {
        try {
            scriptEngineFactory.getScriptEngine(null);
            fail("Should throw ScriptEngineException for null name");
        } catch (ScriptEngineException e) {
            assertEquals("script name is null.", e.getMessage());
        }
    }

    // Test getScriptEngine with non-existent name