jest.config.js /* eslint-disable no-undef */ module.exports = { setupFilesAfterEnv: ['<rootDir>/jestSetup.js'], preset: 'ts-jest', testEnvironment: 'node', transform: { '^.+\\.ts?$': 'ts-jest', }, transformIgnorePatterns: ['<rootDir>/node_modules/'], } 

jestSetup.js const { server } = require('./src/app/mocks/api/server') const AbortController = require('abort-controller') const { fetch, Headers, Request, Response } = require('cross-fetch') // Establish API mocking before all tests. beforeAll(() => { server.listen() }) // Reset any request handlers that we may add during the tests, // so they don't affect other tests. afterEach(() => server.resetHandlers()) // Clean up after the tests are finished. afterAll(() => server.close()) global.fetch = fetch global.Headers = Headers global.Request = Request global.Response = Response global.AbortController = AbortController