// ContentCache is not directly accessible, but we can test through content methods
        assertNotNull(response);
    }

    @Test
    public void testGetContentAsStringWithCache() throws IOException {
        CurlResponse response = new CurlResponse();
        response.setEncoding("UTF-8");
        String testContent = "Hello, World!";
        byte[] data = testContent.getBytes("UTF-8");