node/test/parallel/test-zlib-write-after-flush.js

// Copyright Joyent, Inc. and other Node contributors.
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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 accept writing after flush', async () => {
  for (const [ createCompress, createDecompress ] of [
    [ zlib.createGzip, zlib.createGunzip ],
    [ zlib.createBrotliCompress, zlib.createBrotliDecompress ],
    [ zlib.createZstdCompress, zlib.createZstdDecompress ],
  ]) {
    const { promise, resolve, reject } = Promise.withResolvers();
    const gzip = createCompress();
    const gunz = createDecompress();

    gzip.pipe(gunz);

    let output = '';
    const input = 'A line of data\n';
    gunz.setEncoding('utf8');
    gunz.on('error', reject);
    gunz.on('data', (c) => output += c);
    gunz.on('end', () => {
      assert.strictEqual(output, input);
      resolve();
    });

    // Make sure that flush/write doesn't trigger an assert failure
    gzip.flush();
    gzip.write(input);
    gzip.end();
    gunz.read(0);
    await promise;
  }
});