JSTests/test262/test/built-ins/TypedArray/prototype/map/speciesctor-get-species.js

// Copyright (C) 2018 Peter Wong. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
esid: sec-%typedarray%.prototype.map
description: >
  get @@species from found constructor
info: |
  22.2.3.19 %TypedArray%.prototype.map ( callbackfn [ , thisArg ] )

  ...
  6. Let A be ? TypedArraySpeciesCreate(O, « len »).
  ...

  22.2.4.7 TypedArraySpeciesCreate ( exemplar, argumentList )

  ...
  3. Let constructor be ? SpeciesConstructor(exemplar, defaultConstructor).
  ...

  7.3.20 SpeciesConstructor ( O, defaultConstructor )

  1. Assert: Type(O) is Object.
  2. Let C be ? Get(O, "constructor").
  ...
  5. Let S be ? Get(C, @@species).
  ...
includes: [testTypedArray.js]
features: [Symbol.species, TypedArray]
---*/

testWithTypedArrayConstructors(function(TA) {
  var sample = new TA(2);
  var calls = 0;

  sample.constructor = {};

  Object.defineProperty(sample.constructor, Symbol.species, {
    get: function() {
      calls++;
    }
  });

  sample.map(function() {});

  assert.sameValue(calls, 1);
});