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57 lines
1.4 KiB
57 lines
1.4 KiB
'use strict';
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var test = require('tape');
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var hasPropertyDescriptors = require('../');
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var sentinel = {};
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test('hasPropertyDescriptors', function (t) {
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t.equal(typeof hasPropertyDescriptors, 'function', 'is a function');
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t.equal(typeof hasPropertyDescriptors.hasArrayLengthDefineBug, 'function', '`hasArrayLengthDefineBug` property is a function');
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var yes = hasPropertyDescriptors();
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t.test('property descriptors', { skip: !yes }, function (st) {
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var o = { a: sentinel };
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st.deepEqual(
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Object.getOwnPropertyDescriptor(o, 'a'),
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{
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configurable: true,
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enumerable: true,
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value: sentinel,
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writable: true
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},
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'has expected property descriptor'
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);
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Object.defineProperty(o, 'a', { enumerable: false, writable: false });
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st.deepEqual(
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Object.getOwnPropertyDescriptor(o, 'a'),
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{
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configurable: true,
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enumerable: false,
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value: sentinel,
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writable: false
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},
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'has expected property descriptor after [[Define]]'
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);
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st.end();
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});
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var arrayBug = hasPropertyDescriptors.hasArrayLengthDefineBug();
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t.test('defining array lengths', { skip: !yes || arrayBug }, function (st) {
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var arr = [1, , 3]; // eslint-disable-line no-sparse-arrays
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st.equal(arr.length, 3, 'array starts with length 3');
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Object.defineProperty(arr, 'length', { value: 5 });
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st.equal(arr.length, 5, 'array ends with length 5');
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st.end();
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});
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t.end();
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});
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