48 lines
1.8 KiB
JavaScript
48 lines
1.8 KiB
JavaScript
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'use strict';
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var test = require('tape');
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var defineProperties = require('define-properties');
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var isEnumerable = Object.prototype.propertyIsEnumerable;
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var functionsHaveNames = function f() {}.name === 'f';
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var runTests = require('./tests');
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test('native', function (t) {
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t.equal(Object.assign.length, 2, 'Object.assign has a length of 2');
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t.test('Function name', { skip: !functionsHaveNames }, function (st) {
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st.equal(Object.assign.name, 'assign', 'Object.assign has name "assign"');
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st.end();
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});
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t.test('enumerability', { skip: !defineProperties.supportsDescriptors }, function (et) {
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et.equal(false, isEnumerable.call(Object, 'assign'), 'Object.assign is not enumerable');
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et.end();
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});
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var supportsStrictMode = (function () { return typeof this === 'undefined'; }());
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t.test('bad object value', { skip: !supportsStrictMode }, function (st) {
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st['throws'](function () { return Object.assign(undefined); }, TypeError, 'undefined is not an object');
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st['throws'](function () { return Object.assign(null); }, TypeError, 'null is not an object');
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st.end();
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});
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// v8 in node 0.8 and 0.10 have non-enumerable string properties
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var stringCharsAreEnumerable = isEnumerable.call('xy', 0);
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t.test('when Object.assign is present and has pending exceptions', { skip: !stringCharsAreEnumerable || !Object.preventExtensions }, function (st) {
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// Firefox 37 still has "pending exception" logic in its Object.assign implementation,
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// which is 72% slower than our shim, and Firefox 40's native implementation.
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var thrower = Object.preventExtensions({ 1: '2' });
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var error;
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try { Object.assign(thrower, 'xy'); } catch (e) { error = e; }
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st.equal(error instanceof TypeError, true, 'error is TypeError');
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st.equal(thrower[1], '2', 'thrower[1] === "2"');
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st.end();
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});
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runTests(Object.assign, t);
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t.end();
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});
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