test262/test/language/statements/class/subclass/builtin-objects/Array/contructor-calls-super-single-argument.js

// Copyright (C) 2016 the V8 project authors. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
es6id: 22.1.1
description: >
  Constructor calling super() with a single argument creates an Array object
info: |
  22.1.1 The Array Constructor

  The Array constructor is designed to be subclassable. It may be used as the
  value of an extends clause of a class definition. Subclass constructors that
  intend to inherit the exotic Array behaviour must include a super call to the
  Array constructor to initialize subclass instances that are exotic Array
  objects.
---*/

class Sub extends Array {
  constructor(a) {
    super(a);
  }
}

var sub = new Sub(42);

assert.sameValue(sub.length, 42);