Build your own environment

Out-of-the-box node and jsdom are supported. If other environments are needed simple use the createEnvMixin helper. Create a new file in your code base and reference it in you jest.config.js.

import createEnvMixin from 'jest-doctor/createEnvMixin';
import NodeEnvironment from 'jest-environment-node';
import ThirdPartyEnv from 'thrid-party-env';

// eigther wrap the desire existing environment
const JestDoctorThirdPartyEnv = createEnvMixin(ThirdPartyEnv);

// or pass in your own class
class MyEnv extends NodeEnvironment {}
const JestDoctorMyEnv = createEnvMixin(MyEnv);

In general it is up to you if you want to extend the class or get extended. If you extend dont forget to call all required super.methods.

The prototype of JestEnvironment is using an anonymous arrow function for handleTestEvent. This is sub optimal as it can not be called with super.handleTestEvent. To mitigate this issue jest-doctor introduces a new class property handleEvent which should be called instead.