89 lines
1.9 KiB
Markdown
89 lines
1.9 KiB
Markdown
---
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title: Gremlins.js
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category: JavaScript libraries
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updated: 2017-10-22
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weight: -1
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intro: |
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[Gremlins](https://github.com/marmelab/gremlins.js) is a JavaScript library to do "monkey-testing" by providing random user input (clicks, scrolls, and so on).
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---
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## Example
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### Simple example
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```html
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<script src='https://cdn.jsdelivr.net/npm/gremlins/dist/gremlins.js'></script>
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<script>
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gremlins.createHorde().unleash()
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</script>
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```
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### Custom gremlins
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```js
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gremlins.createHorde()
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.allGremlins()
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.gremlin(function () {
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document.activeElement.blur()
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})
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```
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{: data-line="3,4,5"}
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Runs the given function at regular intervals.
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### Full example
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```js
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gremlins.createHorde()
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.gremlin(gremlins.species.formFiller())
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.gremlin(gremlins.species.clicker()
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.clickTypes(['click'])
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.canClick(element => { ··· })
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.showAction((x, y) => { ··· }))
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.gremlin(gremlins.species.scroller())
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.mogwai(gremlins.mogwais.alert())
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.mogwai(gremlins.mogwais.fps())
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.mogwai(gremlins.mogwais.gizmo().maxErrors(2))
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.unleash()
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```
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By default, all gremlins and mogwais species are added to the horde. Do it this way to customize gremlins.
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See: [Specifying gremlins](https://github.com/marmelab/gremlins.js#setting-gremlins-and-mogwais-to-use-in-a-test)
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## Hooks
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### Before and after
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```js
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gremlins.createHorde()
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.before(function () {
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this.log('sync')
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console.profile('gremlins')
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})
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.after(function () {
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this.log('done')
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console.profileEnd()
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})
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```
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{: data-line="2,6"}
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### Asynchronous
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```js
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gremlins.createHorde()
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.before(function (done) {
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setTimeout(() => {
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this.log('async')
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done()
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}, 500)
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})
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```
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{: data-line="2"}
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## References
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- [marmelab/gremlins.js](https://github.com/marmelab/gremlins.js)
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