Mailspring/spec/jasmine-extensions.es6

import _ from 'underscore';

export function waitsForPromise(...args) {
  let shouldReject;
  let timeout;
  if (args.length > 1) {
    shouldReject = args[0].shouldReject;
    timeout = args[0].timeout
  } else {
    shouldReject = false;
  }
  const fn = _.last(args);

  return window.waitsFor(timeout, (moveOn) => {
    const promise = fn();
    // Keep in mind we can't check `promise instanceof Promise` because parts of
    // the app still use other Promise libraries Just see if it looks
    // promise-like.
    if (!promise || !promise.then) {
      jasmine.getEnv().currentSpec.fail(`Expected callback to return a promise-like object, but it returned ${promise}`);
      return moveOn();
    } else if (shouldReject) {
      promise.catch(moveOn);
      return promise.then(() => {
        jasmine.getEnv().currentSpec.fail("Expected promise to be rejected, but it was resolved");
        return moveOn();
      });
    }

    promise.then(moveOn);
    return promise.catch((error) => {
      // I don't know what `pp` does, but for standard `new Error` objects,
      // it sometimes returns "{  }". Catch this case and fall through to toString()
      let msg = jasmine.pp(error);
      if (msg === "{  }") { msg = error.toString(); }
      jasmine.getEnv().currentSpec.fail(`Expected promise to be resolved, but it was rejected with ${msg}`);
      return moveOn();
    });
  });
}