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https://github.com/redux-things/redux-actions-assertions

Simplify testing of redux action and async action creators
https://github.com/redux-things/redux-actions-assertions

assertions chai jest mocha redux redux-middleware unit-testing

Last synced: 3 months ago
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Simplify testing of redux action and async action creators

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# redux-actions-assertions 

Assertions for redux actions testing.



This library adds assertions for [redux actions](http://redux.js.org/docs/advanced/AsyncActions.html) testing.  

It use [redux-mock-store](https://github.com/arnaudbenard/redux-mock-store) to mock redux store.



[![build status](https://img.shields.io/travis/redux-things/redux-actions-assertions/master.svg?style=flat-square)](https://travis-ci.org/redux-things/redux-actions-assertions)

[![npm version](https://img.shields.io/npm/v/redux-actions-assertions.svg?style=flat-square)](https://www.npmjs.com/package/redux-actions-assertions)



## Supported Assertion Frameworks/Libraries:

- [chai](https://redux-things.github.io/redux-actions-assertions/chai.html)

- [expect](https://redux-things.github.io/redux-actions-assertions/expect.html)

- [expect.js](https://redux-things.github.io/redux-actions-assertions/expectjs.html)

- [jasmine](https://redux-things.github.io/redux-actions-assertions/jasmine.html)

- [jest](https://redux-things.github.io/redux-actions-assertions/jest.html)

- [should](https://redux-things.github.io/redux-actions-assertions/should.html)

- [tape](https://redux-things.github.io/redux-actions-assertions/tape.html)

- [pure javascript assertion](https://redux-things.github.io/redux-actions-assertions/javascript.html)



If you have not found assertion framework/library that you are using - please add comment into [this issue](https://github.com/dmitry-zaets/redux-actions-assertions/issues/3).



## What it does:

- [Allows to avoid retesting nested action creators](#allows-to-avoid-retesting-nested-action-creators);

- [Reduces repetitive code of test methods](#reduces-repetitive-code-of-test-methods);

- [Simplifies initial setup](#simplifies-initial-setup);



### Allows to avoid retesting nested action creators

It allows to test only actions that need to be tested.



**Example:**  

We have two actions (A, B). Each one makes async http requests.  

Action A makes a request and if the result is successful it triggers Action B.  

Action B is also used as an independent action.  

Action B can be tested separately.  

Therefore, we don't need to test it again in Action A.  



Actions:

```javascript

function actionA() {

  return dispatch => {

    dispatch(actionAStart());

    return api.getA().then(response => {

        dispatch(actionAFinish(response));

        dispatch(actionB());

      }).catch(err => {

        dispatch(actionAFailure(err));

      });

    };

}



function actionB() {

  return dispatch => {

    dispatch(actionBStart());

    return api.getB().then(response => {

        dispatch(actionBFinish(response));

      }).catch(err => {

        dispatch(actionBFailure(err));

      });

    };

}

```



Without:

```javascript

const expectedActions = [

  { type: action_a_start },

  { type: action_a_success },   

  { type: action_b_start }, // retesting of action B

  { type: action_b_success } // retesting of action B];

const store = mockStore({ todos: [] });

store.dispatch(actionA()).then(() => {

  expect(store.getActions()).toEqual(expectedActions);

}).then(done).catch(done);

```



With:

```javascript

expect(actionA()).withState({ todos: [] }).toDispatch([

  { type: action_a_start },

  { type: action_a_success },

  actionB() // just executing tested action

], done);

```



### Reduces repetitive code of test methods

It reduces boilerplate of test methods and makes testing fluent.



Without:

```javascript

const store = mockStore(/* initial state */);

const expectedActions = [

  { type: types.FETCH_TODOS_REQUEST },

  /* All expected triggered action objects */

];

store.dispatch(fetchData()).then(() => {

  const actions = store.getActions();

  expect(actions).toEqual(expectedActions);

}).then(done).catch(done);

```



With:

```javascript

const expectedActions = [

  /*All expected triggered action objects or action creator functions*/

];

expect(fetchData()).toDispatchActions(expectedActions, done);

```



With using customised store state:

```javascript

expect(fetchData()).withState({/*custom state*/}).toDispatchActions(expectedActions, done);

```



### Simplifies initial setup

It provides singe-time global configuration for middlewares and initial store state.



Without:

```javascript

const middlewares = [thunk];

const mockStore = configureStore(middlewares);

const store = mockStore({ /*initial store object*});

```

With:

```javascript

registerMiddlewares([ thunk ]);

// to set custom initial state 

registerInitialStoreState(/*object of function*/);

// to generate initial state of your application

registerInitialStoreState(buildInitialStoreState(/*your root reducer*/));

```



## Installation



Using [npm](https://www.npmjs.org/):



    $ npm install --save-dev redux-actions-assertions



### Redux middlewares registration



```js

// using ES6 modules

import { registerMiddlewares } from 'redux-actions-assertions';



// using CommonJS modules

var registerMiddlewares = require('redux-actions-assertions').registerMiddlewares;



// registration

registerMiddlewares([

  /* Here you need to list your middlewares */

]);

```



### Default initial store state registration



**By using state object or function:**

```js

// using ES6 modules

import { registerInitialStoreState } from 'redux-actions-assertions';



// using CommonJS modules

var registerInitialStoreState = require('redux-actions-assertions').registerInitialStoreState;



// registration

registerInitialStoreState(/* default initial state object or function */);

```

**By using your root reducer:**

```js

// using ES6 modules

import { buildInitialStoreState, registerInitialStoreState } from 'redux-actions-assertions';



// using CommonJS modules

var reduxActionsAssertions = require('redux-actions-assertions');

var registerInitialStoreState = reduxActionsAssertions.registerInitialStoreState;



// registration

registerInitialStoreState(buildInitialStoreState(/* root reducer function */));

```