silence console.log for a Promise in a test

silent_gen.js

function *silentLog(p) {
  function restoreLog() {return console.log = logg, undefined;}
  const logg = console.log;
  console.log = function() {}
  const [fulfill, reject] = yield;
  p().then(fulfill, reject).then(restoreLog, restoreLog);
}

function withSilentLog(youPromised, handleFulfill = function() {}, handleReject = function() {}) {
  const it = silentLog(youPromised);
  it.next();
  it.next([handleFulfill, handleReject]);
}

// Lots of work just to accomplish this!
withSilentLog(() => getAllOpinions('discussion_id'), null, fn);