How to use the nock/lib/common.isContentEncoded function in nock

getChunksFromBody(body, headers) {
    if (!body) {
      return [];
    }

    if (Buffer.isBuffer(body)) {
      return [body];
    }

    // If content-encoding is set in the header then the body/content
    // is as an array of hex strings
    if (isContentEncoded(headers)) {
      const hexChunks = JSON.parse(body);

      return hexChunks.map(chunk => Buffer.from(chunk, 'hex'));
    }

    const buffer = Buffer.from(body);

    // The body can be one of two things:
    //  1. A hex string which then means its binary data.
    //  2. A utf8 string which means a regular string.
    return [Buffer.from(buffer, isUtf8Representable(buffer) ? 'utf8' : 'hex')];
  }
}

getBodyFromChunks(chunks, headers) {
    // If content-encoding is set in the header then the body/content
    // should not be concatenated. Instead, the chunks should
    // be preserved as-is so that each chunk can be mocked individually
    if (isContentEncoded(headers)) {
      const hexChunks = chunks.map(chunk => {
        if (!Buffer.isBuffer(chunk)) {
          this.assert(
            'content-encoded responses must all be binary buffers',
            typeof chunk === 'string'
          );
          chunk = Buffer.from(chunk);
        }

        return chunk.toString('hex');
      });

      return JSON.stringify(hexChunks);
    }

    const buffer = mergeChunks(chunks);