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Added documentation on how to do unit testing #69

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Expand Up @@ -114,6 +114,22 @@ eventListeners=[
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```

## Unit Testing

This is based on what tool or framework are you using for testing, this configuration is for Jest, the one that is working out-of-the-box with [CRA](https://github.com/facebook/create-react-app). In order to properly work you must:

* Install [`jest-canvas-mock` library](https://github.com/hustcc/jest-canvas-mock)
* Go to your `setupTests.js` file, in the top of your file do as follows:
```javascript
...
import 'jest-canvas-mock';

...
```
* Once you imported the file, restart Jest on your console and you're ready to go

For other frameworks besides Jest, you have to check if it uses JSDom or what JavaScript implementation is using, and check if that implementation mimics the `canvas` element, if not, you should do the same, probably.

## Related Projects

* [Bodymovin](https://github.com/bodymovin/bodymovin) react-lottie is a wrapper of bodymovin
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