core-js/tests/unit-global/es.reflect.define-property.js

import { DESCRIPTORS } from '../helpers/constants.js';

QUnit.test('Reflect.defineProperty', assert => {
  const { defineProperty } = Reflect;
  const { getOwnPropertyDescriptor, create } = Object;
  assert.isFunction(defineProperty);
  assert.arity(defineProperty, 3);
  assert.name(defineProperty, 'defineProperty');
  assert.looksNative(defineProperty);
  assert.nonEnumerable(Reflect, 'defineProperty');
  let object = {};
  assert.true(defineProperty(object, 'foo', { value: 123 }));
  assert.same(object.foo, 123);
  if (DESCRIPTORS) {
    object = {};
    defineProperty(object, 'foo', {
      value: 123,
      enumerable: true,
    });
    assert.deepEqual(getOwnPropertyDescriptor(object, 'foo'), {
      value: 123,
      enumerable: true,
      configurable: false,
      writable: false,
    });
    assert.false(defineProperty(object, 'foo', {
      value: 42,
    }));
  }
  assert.throws(() => defineProperty(42, 'foo', {
    value: 42,
  }), TypeError, 'throws on primitive');
  assert.throws(() => defineProperty(42, 1, {}));
  assert.throws(() => defineProperty({}, create(null), {}));
  assert.throws(() => defineProperty({}, 1, 1));
  // ToPropertyDescriptor errors should throw, not return false
  assert.throws(() => defineProperty({}, 'a', { get: 42 }), TypeError, 'throws on non-callable getter');
  assert.throws(() => defineProperty({}, 'a', { set: 'str' }), TypeError, 'throws on non-callable setter');
  assert.throws(() => defineProperty({}, 'a', { get: null }), TypeError, 'throws on null getter');
  assert.throws(() => defineProperty({}, 'a', { get: false }), TypeError, 'throws on false getter');
  if (DESCRIPTORS) {
    assert.throws(() => defineProperty({}, 'a', { get() { /* empty */ }, value: 1 }), TypeError, 'throws on mixed accessor/data descriptor');
    assert.true(defineProperty({}, 'a', { get: undefined }), 'undefined getter is valid');
  }
});

QUnit.test('Reflect.defineProperty.sham flag', assert => {
  assert.same(Reflect.defineProperty.sham, DESCRIPTORS ? undefined : true);
});