source: imaps-frontend/node_modules/object.assign/test/native.js

'use strict';

var test = require('tape');
var defineProperties = require('define-properties');
var isEnumerable = Object.prototype.propertyIsEnumerable;
var functionsHaveNames = require('functions-have-names')();

var runTests = require('./tests');

test('native', function (t) {
        t.equal(Object.assign.length, 2, 'Object.assign has a length of 2');
        t.test('Function name', { skip: !functionsHaveNames }, function (st) {
                st.equal(Object.assign.name, 'assign', 'Object.assign has name "assign"');
                st.end();
        });

        t.test('enumerability', { skip: !defineProperties.supportsDescriptors }, function (et) {
                et.equal(false, isEnumerable.call(Object, 'assign'), 'Object.assign is not enumerable');
                et.end();
        });

        var supportsStrictMode = (function () { return typeof this === 'undefined'; }());

        t.test('bad object value', { skip: !supportsStrictMode }, function (st) {
                st['throws'](function () { return Object.assign(undefined); }, TypeError, 'undefined is not an object');
                st['throws'](function () { return Object.assign(null); }, TypeError, 'null is not an object');
                st.end();
        });

        // v8 in node 0.8 and 0.10 have non-enumerable string properties
        var stringCharsAreEnumerable = isEnumerable.call('xy', 0);
        t.test('when Object.assign is present and has pending exceptions', { skip: !stringCharsAreEnumerable || !Object.preventExtensions }, function (st) {
                /*
                 * Firefox 37 still has "pending exception" logic in its Object.assign implementation,
                 * which is 72% slower than our shim, and Firefox 40's native implementation.
                 */
                var thrower = Object.preventExtensions({ 1: '2' });
                var error;
                try { Object.assign(thrower, 'xy'); } catch (e) { error = e; }
                st.equal(error instanceof TypeError, true, 'error is TypeError');
                st.equal(thrower[1], '2', 'thrower[1] === "2"');

                st.end();
        });

        runTests(Object.assign, t);

        t.end();
});