index.js•1.41 kB
'use strict';
var test = require('tape');
var hasPropertyDescriptors = require('../');
var sentinel = {};
test('hasPropertyDescriptors', function (t) {
t.equal(typeof hasPropertyDescriptors, 'function', 'is a function');
t.equal(typeof hasPropertyDescriptors.hasArrayLengthDefineBug, 'function', '`hasArrayLengthDefineBug` property is a function');
var yes = hasPropertyDescriptors();
t.test('property descriptors', { skip: !yes }, function (st) {
var o = { a: sentinel };
st.deepEqual(
Object.getOwnPropertyDescriptor(o, 'a'),
{
configurable: true,
enumerable: true,
value: sentinel,
writable: true
},
'has expected property descriptor'
);
Object.defineProperty(o, 'a', { enumerable: false, writable: false });
st.deepEqual(
Object.getOwnPropertyDescriptor(o, 'a'),
{
configurable: true,
enumerable: false,
value: sentinel,
writable: false
},
'has expected property descriptor after [[Define]]'
);
st.end();
});
var arrayBug = hasPropertyDescriptors.hasArrayLengthDefineBug();
t.test('defining array lengths', { skip: !yes || arrayBug }, function (st) {
var arr = [1, , 3]; // eslint-disable-line no-sparse-arrays
st.equal(arr.length, 3, 'array starts with length 3');
Object.defineProperty(arr, 'length', { value: 5 });
st.equal(arr.length, 5, 'array ends with length 5');
st.end();
});
t.end();
});