action-test.js

import * as actions from './actions';

const dispatch = spy();
const getState = () => ({
  ...your mocked state
});

describe('Action A', () => {
  it('should dispatch a correctly formatted action', () => {
    actions.actionA('first arg', 'second arg')(dispatch, getState);
    expect(dispatch).to.have.been.calledWith({
      ...expected action shape
    });
    dispatch.reset();
  });
});