Let's say I have a mapbox map. The mapbox map has an onclick handler, and within the onclick handler's callback, a function is called:
import { Map } from 'mapbox-gl'
const map = new Map({
container: someContainer,
center,
zoom
})
map.on('click', e => {
const { lng, lat } = e.lngLat
runSomeFunction(lat, lng). // <---- i want to test this function
})
I want to test my map using jest. There's already a lot of questions out there surrounding the fact that the mapbox-gl fails pretty hard outside the browser environment. While some people have tried to find workarounds (fixing the window.URL. createObjectURL problem, using the defunct mapbox-gl-js-mock repo, overcoming the lack of GL in the jest envinroment), I've been going down that rabbit hole for about 2 days. Its time for another approach.
Many talk about mocking mapbox, like this:
jest.mock('mapbox-gl', () => ({
Map: jest.fn(() => ({
on: jest.fn(),
otherMethods: jest.fn(),
})),
}));
I can use this method and get my tests to pass. But I can't really test any interesting behavior. How can I mock the behavior of a user clicking on the map, and test that I expect(runSomeFunction).toHaveBeenCalledWith(whatever)?
I really don't know where to start, as I can't find a single example of a jest unit test that actually tests map behavior or events. In hopes of finding something parallel, I've also looked into how to test leaflet map events in jest, but I haven't found anything helpful.
