@wordpress/e2e-test-utils/build-module/mocks/mock-or-transform.js

End-To-End (E2E) test utils for WordPress.

/**
 * External dependencies
 */
import fetch from 'node-fetch';

/**
 * Internal dependencies
 */
import { getJSONResponse } from '../shared/get-json-response';

/**
 * Mocks a request with the supplied mock object, or allows it to run with an optional transform, based on the
 * deserialised JSON response for the request.
 *
 * @param {Function}           mockCheck               function that returns true if the request should be mocked.
 * @param {Object}             mock                    A mock object to wrap in a JSON response, if the request should be mocked.
 * @param {Function|undefined} responseObjectTransform An optional function that transforms the response's object before the response is used.
 * @return {Promise} Promise that uses `mockCheck` to see if a request should be mocked with `mock`, and optionally transforms the response with `responseObjectTransform`.
 */
export function mockOrTransform(mockCheck, mock, responseObjectTransform = obj => obj) {
  return async request => {
    // Because we can't get the responses to requests and modify them on the fly,
    // we have to make our own request and get the response, then apply the
    // optional transform to the json encoded object.
    const response = await fetch(request.url(), {
      headers: request.headers(),
      method: request.method(),
      body: request.postData()
    });
    const responseObject = await response.json();
    if (mockCheck(responseObject)) {
      request.respond(getJSONResponse(mock));
    } else {
      request.respond(getJSONResponse(responseObjectTransform(responseObject)));
    }
  };
}
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