// ## Act ##
        String result = response.getContentAsString();

        // ## Assert ##
        assertEquals("", result);
    }

    @Test
    public void test_GetContentAsString_UnicodeContent() {
        // ## Arrange ##
        String content = "日本語テスト 🎉";
        CurlResponse response = new CurlResponse();
        response.setEncoding("UTF-8");