node/test/parallel/test-zlib-flush-flags.js

'use strict';
require('../common');
const assert = require('assert');
const zlib = require('zlib');

assert.doesNotThrow(() => {
  zlib.createGzip({ flush: zlib.constants.Z_SYNC_FLUSH });
});

assert.throws(() => {
  zlib.createGzip({ flush: 'foobar' });
}, /Invalid flush flag: foobar/);

assert.throws(() => {
  zlib.createGzip({ flush: 10000 });
}, /Invalid flush flag: 10000/);

assert.doesNotThrow(() => {
  zlib.createGzip({ finishFlush: zlib.constants.Z_SYNC_FLUSH });
});

assert.throws(() => {
  zlib.createGzip({ finishFlush: 'foobar' });
}, /Invalid flush flag: foobar/);

assert.throws(() => {
  zlib.createGzip({ finishFlush: 10000 });
}, /Invalid flush flag: 10000/);