I felt thatavatar-generator needed some testing.
This PR setup the testing environment usingbs-jest/bs-react-testing-library and add some tests here and there.
It's not much, but it's always better to have some tests.

Testing a ReasonReact component

bs-react-testing-library + bs-jest

I created a wrapper component calledTestId which pass the data-testid (used byreact-testing-library) props to its children.
As Reasondoesn’t support using props with dashes.
I don't really like this method as it requires addingextra code to the source files, but it works.

1 - Wrap your component using theTestId Wrapper inside your source file
2 - Render your component inside your test file
3 - You can query your elements using yourdata-testid or using other queries (queryByLabelText,queryByTitle,queryByText...) andfire some events.

Testing a Reason function

bs-jest

NOTE: I had to add ababel.config.js file and atransformIgnorePatterns options in thejest configuration because of the es6 modules (related issue).
I also had to add the presetbabel-preset-gatsby because gatsby returned an error during the compilation if I did not specify it.