'use strict'; const common = require('../common'); const assert = require('assert'); const stream = require('stream'); const writable = new stream.Writable(); writable._write = (chunk, encoding, cb) => { assert.strictEqual(writable._writableState.ended, false); cb(); }; assert.strictEqual(writable._writableState.ended, false); writable.end('testing ended state', common.mustCall(() => { assert.strictEqual(writable._writableState.ended, true); })); assert.strictEqual(writable._writableState.ended, true);