58 lines
1.4 KiB
JavaScript
58 lines
1.4 KiB
JavaScript
'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();
|
|
});
|