var inherits = require('./inherits.js') var assert = require('assert') function test(c) { assert(c.constructor === Child) assert(c.constructor.super_ === Parent) assert(Object.getPrototypeOf(c) === Child.prototype) assert(Object.getPrototypeOf(Object.getPrototypeOf(c)) === Parent.prototype) assert(c instanceof Child) assert(c instanceof Parent) } function Child() { Parent.call(this) test(this) } function Parent() {} inherits(Child, Parent) var c = new Child test(c) console.log('ok')