Current File : /var/www/html/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();
});
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