Test a redux-thunk action

actions_spec.js

describe('saveResource', () => {
  let resource = { id: 5, name: 'foo' };

  describe('when the response is a 200', () => {
    let dispatch = jasmine.createSpy('dispatch');
    beforeEach(() => {
      spyOn(Service, 'post').and.callFake(function(url, payload, callback) {
        callback(200, {foo: 'bar'})
      })
    });

    it('posts the data to the Service class and dispatches RESOURCE_SUCCESSFULLY_SAVED', () => {
      Actions.saveResource(resource)(dispatch)
      expect(Service.post).toHaveBeenCalledWith(
        '/your/path',
        resource,
        jasmine.any(Function)
      )
      expect(dispatch).toHaveBeenCalledWith(
        {type: 'RESOURCE_SUCCESSFULLY_SAVED', data: { foo: 'bar' }}
      )
    });
  });
});