// Test getResponseBody when no body is set
        ResponseData data = new ResponseData();
        assertNull(data.getResponseBody());
    }

    public void test_metaDataOperations() {
        // Test metadata operations
        ResponseData data = new ResponseData();

        // Add metadata
        data.addMetaData("key1", "value1");
        data.addMetaData("key2", 123);