Reducer.test.js

import Reducer from './Reducer';

describe('reducer', () => {
  it('should handle the Action REQUEST_ADVICE', () => {
    expect(
      Reducer(
        {
          fetching: false,
          randomAdvice: null,
        },
        {
          type: 'REQUEST_ADVICE',
        },
      ),
    ).toEqual({
      fetching: true,
      randomAdvice: null,
    });
  });

  it('should handle the Action RESPONSE_ADVICE_FAILURE', () => {
    expect(
      Reducer(
        {
          fetching: true,
        },
        {
          type: 'RESPONSE_ADVICE_FAILURE',
        },
      ),
    ).toEqual({
      fetching: false,
    });
  });

  it('should handle the Action RESPONSE_ADVICE_SUCCESS', () => {
    expect(
      Reducer(
        {
          fetching: false,
          randomAdvice: null,
        },
        {
          type: 'RESPONSE_ADVICE_SUCCESS',
          payload: 'Random advice inserted',
        },
      ),
    ).toEqual({
      fetching: false,
      randomAdvice: 'Random advice inserted',
    });
  });
});