properties-arg-to-object.js

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// Copyright (C) 2019 Leo Balter. All rights reserved.

// This code is governed by the BSD license found in the LICENSE file.

/*---

esid: sec-object.create

description: >

  The Properties argument is cast to an object if not undefined

info: |

  Object.create ( O, Properties )

  3. If Properties is not undefined, then

    a. Return ? ObjectDefineProperties(obj, Properties).

  Runtime Semantics: ObjectDefineProperties ( O, Properties )

  2. Let props be ? ToObject(Properties).

  3. Let keys be ? props.[[OwnPropertyKeys]]().

...

  // All enumerable keys are added to the created object.

features: [Symbol]

---*/

var proto = {};

var obj;

obj = Object.create(proto, true);

assert.sameValue(Object.getPrototypeOf(obj), proto, 'Properties is true: prototype is set');

assert.sameValue(Object.getOwnPropertyNames(obj).length, 0, 'Properties is true: no keys set');

assert.sameValue(Object.getOwnPropertySymbols(obj).length, 0, 'Properties is true: no symbol keys set');

obj = undefined;

obj = Object.create(proto, false);

assert.sameValue(Object.getPrototypeOf(obj), proto, 'Properties is false: prototype is set');

assert.sameValue(Object.getOwnPropertyNames(obj).length, 0, 'Properties is false: no keys set');

assert.sameValue(Object.getOwnPropertySymbols(obj).length, 0, 'Properties is false: no symbol keys set');

obj = undefined;

obj = Object.create(proto, 1);

assert.sameValue(Object.getPrototypeOf(obj), proto, 'Properties is 1: prototype is set');

assert.sameValue(Object.getOwnPropertyNames(obj).length, 0, 'Properties is 1: no keys set');

assert.sameValue(Object.getOwnPropertySymbols(obj).length, 0, 'Properties is 1: no symbol keys set');

obj = undefined;

obj = Object.create(proto, NaN);

assert.sameValue(Object.getPrototypeOf(obj), proto, 'Properties is NaN: prototype is set');

assert.sameValue(Object.getOwnPropertyNames(obj).length, 0, 'Properties is NaN: no keys set');

assert.sameValue(Object.getOwnPropertySymbols(obj).length, 0, 'Properties is NaN: no symbol keys set');

obj = undefined;

obj = Object.create(proto, '');

assert.sameValue(Object.getPrototypeOf(obj), proto, 'Properties is the empty string: prototype is set');

assert.sameValue(Object.getOwnPropertyNames(obj).length, 0, 'Properties is the empty string: no keys set');

assert.sameValue(Object.getOwnPropertySymbols(obj).length, 0, 'Properties is the empty string: no symbol keys set');

obj = undefined;

obj = Object.create(proto, Symbol('s'));

assert.sameValue(Object.getPrototypeOf(obj), proto, 'Properties is symbol: prototype is set');

assert.sameValue(Object.getOwnPropertyNames(obj).length, 0, 'Properties is symbol: no keys set');

assert.sameValue(Object.getOwnPropertySymbols(obj).length, 0, 'Properties is symbol: no symbol keys set');

reportCompare(0, 0);