test/parallel/test-zlib-empty-buffer.js

'use strict';
require('../common');
const zlib = require('zlib');
const { inspect, promisify } = require('util');
const assert = require('assert');
const emptyBuffer = Buffer.alloc(0);

(async function() {
  for (const [ compress, decompress, method ] of [
    [ zlib.deflateRawSync, zlib.inflateRawSync, 'raw sync' ],
    [ zlib.deflateSync, zlib.inflateSync, 'deflate sync' ],
    [ zlib.gzipSync, zlib.gunzipSync, 'gzip sync' ],
    [ promisify(zlib.deflateRaw), promisify(zlib.inflateRaw), 'raw' ],
    [ promisify(zlib.deflate), promisify(zlib.inflate), 'deflate' ],
    [ promisify(zlib.gzip), promisify(zlib.gunzip), 'gzip' ]
  ]) {
    const compressed = await compress(emptyBuffer);
    const decompressed = await decompress(compressed);
    assert.deepStrictEqual(
      emptyBuffer, decompressed,
      `Expected ${inspect(compressed)} to match ${inspect(decompressed)} ` +
      `to match for ${method}`);
  }
})();