Testing redux middleware with promises

i want to test this redux middleware code for my react app:

export const dispatchActionFromPromise = next => (promise, name) => {
      promise.then(data => {
        next({
          type: `${name}_RECEIVED`,
          data
        });
      },
      error => {
        return next({
          type: `${name}_ERROR`,
          error
        });
      });
};

const dataService = store => next => action => {
  next(action);

  switch (action.type) {
    case GET_ORGANISATIONS:
      dispatchActionFromPromise(next)(ApiClient.getOrganisations(), GET_ORGANISATIONS);
      break;
    default:
      break;
  }

};

export default dataService;

I want to test getOrganisations() which returns a promise (ApiClient.getOrganisations() returns a promise). What would be worth testing here, if any, and how would i best approach testing this?

I am using mocha and chai for my testing. Thanks