@reatom/testing v3.4.9

Small context wrapper simplify your mocking and testing.

Installation

npm i @reatom/testing

Usage

import { createTestCtx, mockFn } from '@reatom/testing'

export interface TestCtx extends Ctx {
  mock<T>(anAtom: Atom<T>, fallback: T): Unsubscribe

  mockAction<T>(anAction: Action<any[], T>, cb: Fn<[Ctx], T>): Unsubscribe

  subscribeTrack<T, F extends Fn<[T]>>(
    anAtom: Atom<T>,
    cb?: F,
  ): F & {
    unsubscribe: Unsubscribe
    calls: ReturnType<typeof mockFn<[T], any>>['calls']
    lastInput: ReturnType<typeof mockFn<[T], any>>['lastInput']
  }
}

declare function mockFn<I extends any[], O>(
  fn?: (...input: I) => O,
): ((...input: I) => O) & {
  calls: Array<{ i: I; o: O }>
  lastInput: Fn<[], I[0]>
}