Test with extra dispatched action in middleware

[Cicko]

Hi coders! I would like to test my middleware and in my case I use it to check if an input field value has correct pattern to display an error in case of not.

My ValidationMiddleware.js:

import { FORM_SET_VALUE, FORM_SET_ERROR } from '../../../lib/components/containers/form/store/constants';

const validationMiddleware = store => next => action => {
    if (action.type !== FORM_SET_VALUE) {
        return next(action);
    }
    const { pattern, value, attr } = action;
    const state = store.getState();
    const newError = new RegExp(pattern).exec(value) === null;
    const oldError = state.form.form[attr] ? state.form.form[attr].error : false;
    if (newError !== oldError) {
        store.dispatch({
            type: FORM_SET_ERROR,
            error: newError,
            attr,
        });
    }
    next(action);
};

export default validationMiddleware; 

And my ValidationMiddleware.text.js:

const configureMockStore = require('redux-mock-store').default;
import validationMiddleware from './validationMiddleware';
import { FORM_SET_ERROR } from '../../../lib/components/containers/form/store/constants';
import { setFormValue } from '../../../lib/components/containers/form/store/actions';

const mockStore = configureMockStore([validationMiddleware]);

describe('Validation middleware', () => {
    it('should dispatch error when wrong value for specific pattern', () => {

        const store = mockStore({
            form: {
                form: {
                    field: {
                        error: false,
                    },
                },
            },
        });
        store.dispatch(setFormValue('field', '123', '^[a-zA-Z\-\'. ]*$'));
        const expectedPayload = {
            type: FORM_SET_ERROR,
            attr: 'field',
            error: true,
        };
        const actions = store.getActions();
        expect(actions).toEqual([expectedPayload]);
    });
});

The point is that it dispatches another action in case of error so there are two different actions dispatched instead of one (FORM_SET_ERROR and FORM_SET_VALUE).

So I don't know how to check if the FORM_SET_ERROR was dispatched. Any ideas?

Thank you in advance!