nodejs/test/parallel/test-zlib-zero-byte.js

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'use strict';

require('../common');

const assert = require('node:assert');
const zlib = require('node:zlib');
const { test } = require('node:test');

test('zlib should properly handle zero byte input', async () => {
  for (const Compressor of [zlib.Gzip, zlib.BrotliCompress]) {
    const { promise, resolve, reject } = Promise.withResolvers();
    const gz = Compressor();
    const emptyBuffer = Buffer.alloc(0);
    let received = 0;
    gz.on('data', function(c) {
      received += c.length;
    });
    gz.on('error', reject);
    gz.on('end', function() {
      const expected = Compressor === zlib.Gzip ? 20 : 1;
      assert.strictEqual(received, expected,
                         `${received}, ${expected}, ${Compressor.name}`);
      resolve();
    });
    gz.write(emptyBuffer);
    gz.end();
    await promise;
  }
});