byte[] originalBytes = testData.getBytes();

        byte[] compressed = searchHelper.gzipCompress(originalBytes);
        byte[] decompressed = searchHelper.gzipDecompress(compressed);

        assertEquals(testData, new String(decompressed));
        // For small strings, gzip overhead might make compressed data larger

            assertNotNull(response.getContentAsString());
        }
    }

    // --- GZIP response tests ---

    /**
     * Helper to GZIP-compress a string.
     */
    private byte[] gzipCompress(String text) throws IOException {
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        try (GZIPOutputStream gos = new GZIPOutputStream(baos)) {
            gos.write(text.getBytes(StandardCharsets.UTF_8));