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metamask-extension/test/unit-global/frozenPromise.js
Erik Marks 478d6563f2
Freeze Promise global on boot (#7309)
* freeze background and UI Promise globals on boot

* add new tests

* remove tape
2019-10-24 06:54:32 -07:00

56 lines
1.2 KiB
JavaScript

/* eslint-disable no-native-reassign */
// this is what we're testing
require('../../app/scripts/lib/freezeGlobals')
const assert = require('assert')
describe('Promise global is immutable', () => {
it('throws when reassinging promise (syntax 1)', () => {
try {
Promise = {}
assert.fail('did not throw error')
} catch (err) {
assert.ok(err, 'did throw error')
}
})
it('throws when reassinging promise (syntax 2)', () => {
try {
global.Promise = {}
assert.fail('did not throw error')
} catch (err) {
assert.ok(err, 'did throw error')
}
})
it('throws when mutating existing Promise property', () => {
try {
Promise.all = () => {}
assert.fail('did not throw error')
} catch (err) {
assert.ok(err, 'did throw error')
}
})
it('throws when adding new Promise property', () => {
try {
Promise.foo = 'bar'
assert.fail('did not throw error')
} catch (err) {
assert.ok(err, 'did throw error')
}
})
it('throws when deleting Promise from global', () => {
try {
delete global.Promise
assert.fail('did not throw error')
} catch (err) {
assert.ok(err, 'did throw error')
}
})
})