mock-property ^{[![Version Badge][npm-version-svg]][package-url]}

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Given an object and a property, replaces a property descriptor (or deletes it), and returns a thunk to restore it.

Example

``js
var mockProperty = require('mock-property');
var assert = require('assert');

var i = 0;
var object = {
a: 1,
get b() {
i += 1;
return 'b ' + i;
}
};

assert.equal(object.a, 1);
assert.equal(object.b, 'b 1');
assert.equal(object.b, 'b 2');

var restoreA = mockProperty(object, 'a', { 'delete': true });
assert.equal('a' in object, false);

var restoreB = mockProperty(object, 'b', { value: 42 });
assert.equal(object.b, 42);

restoreA();
assert.equal('a' in object, true);

restoreB();
assert.equal(object.b, 'b 3');
`

Tests


Simply clone the repo, npm install, and run npm test`

Security

Please email @ljharb or see https://tidelift.com/security if you have a potential security vulnerability to report.

[package-url]: https://npmjs.org/package/mock-property
[npm-version-svg]: https://versionbadg.es/ljharb/mock-property.svg
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[deps-url]: https://david-dm.org/ljharb/mock-property
[dev-deps-svg]: https://david-dm.org/ljharb/mock-property/dev-status.svg
[dev-deps-url]: https://david-dm.org/ljharb/mock-property#info=devDependencies
[npm-badge-png]: https://nodei.co/npm/mock-property.png?downloads=true&stars=true
[license-image]: https://img.shields.io/npm/l/mock-property.svg
[license-url]: LICENSE
[downloads-image]: https://img.shields.io/npm/dm/mock-property.svg
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[actions-url]: https://github.com/ljharb/mock-property/actions