Object.{values,entries} tests

[ljharb]

I'm putting this PR up now for https://github.com/tc39/proposal-object-values-entries to hopefully work out any kinks before the next meeting, and to aid in implementation in various browsers.

I'll be happy to correct any tweaks pointed out, no matter how minor, including adding missing test cases. Thanks!

[anba]

Test262Error.js is auto-included.

[anba]

And tests using Proxies could be useful to check implementations perform the operations in the correct order. For example something simple like:

var log = "";
var object = {a: 0, b: 0, c: 0};
var handler = {
  get: function(target, propertyKey, receiver) {
    assert.sameValue(target, object, "get target");
    assert.sameValue(receiver, proxy, "get receiver");
    log += "|get:" + propertyKey;
    return target[propertyKey];
  },
  getOwnPropertyDescriptor: function(target, propertyKey) {
    assert.sameValue(target, object, "getOwnPropertyDescriptor");
    log += "|getOwnPropertyDescriptor:" + propertyKey;
    return Object.getOwnPropertyDescriptor(target, propertyKey);
  },
  ownKeys: function(target) {
    assert.sameValue(target, object, "ownKeys");
    log += "|ownKeys";
    return Object.getOwnPropertyNames(target);
  }
};
var check = {
  get: function(target, propertyKey, receiver) {
    assert(propertyKey in target, "handler check: " + propertyKey);
    return target[propertyKey];
  }
};
var proxy = new Proxy(object, new Proxy(handler, check));
var result = Object.values(proxy);
assert.sameValue(log, "|ownKeys|getOwnPropertyDescriptor:a|get:a|getOwnPropertyDescriptor:b|get:b|getOwnPropertyDescriptor:c|get:c", log);

[ljharb]

Proxy tests added, thanks for the suggestion!

[ljharb]

I believe the only remaining issue is the verifyConfigurable ordering, which I'd prefer to be obviated by #452.

Please let me know if there's anything else!

[ljharb]

Thanks @goyakin!