es.object.define-getter.js

import { DESCRIPTORS, STRICT } from '../helpers/constants';

import __defineGetter__ from 'core-js-pure/es/object/define-getter';
import __defineSetter__ from 'core-js-pure/es/object/define-setter';

if (DESCRIPTORS) {
  QUnit.test('Object#__defineGetter__', assert => {
    assert.isFunction(__defineGetter__);
    const object = {};
    assert.same(__defineGetter__(object, 'key', () => 42), undefined, 'void');
    assert.same(object.key, 42, 'works');
    __defineSetter__(object, 'key', function () {
      this.foo = 43;
    });
    object.key = 44;
    assert.same(object.key, 42, 'works with setter #1');
    assert.same(object.foo, 43, 'works with setter #2');
    if (STRICT) {
      assert.throws(() => __defineGetter__(null, 1, () => { /* empty */ }), TypeError, 'Throws on null as `this`');
      assert.throws(() => __defineGetter__(undefined, 1, () => { /* empty */ }), TypeError, 'Throws on undefined as `this`');
    }
  });
}