'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(); });