JSTests/test262/test/language/statements/class/subclass/builtin-objects/String/super-must-be-called.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: 21.1.1
description: Super need to be called to initialize internals
info: >
  21.1.1 The String Constructor

  ...
  The String 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 specified String behaviour must include a super call to
  the String constructor to create and initialize the subclass instance with a
  [[StringData]] internal slot.
---*/

class S1 extends String {
  constructor() {}
}

assert.throws(ReferenceError, function() {
  new S1();
});

class S2 extends String {
  constructor() {
    super();
  }
}

new S2();