testing an action

action.js

export function simple(num) {
   return {
     type: 'add',
     payload: {
       num
     }
   };
}

export function withDispatch(num) {
  return dispatch => {
     dispatch({
       type: 'add',
       payload: {
         num,
       }
     });
  };
};

action.spec.js

import * as actions from './actions';
import sinon from 'sinon';
describe('simple', () => {
  it('should return add action with the num passed', () => {
    action.simple(4).should.eql({
      type: 'add',
      payload: {
        num: 4
      }
    });
  });
});

describe('withDispatch', () => {
  it('should dispatch add action with the num passed', () => {
    const dispatch = sinon.stub();
    action.withDispatch(3)(dispatch);
    
    dispatch.calledOnce.should.be.true();
    dispatch.getCall(0).args[0].should.eql({
      type: 'add',
      payload: {
        num: 3
      }
    });
  });
});

package.json

{
  "scripts": "mocha -r should '*.spec.js'"
}