gecko/services/sync/tests/unit/test_async_exceptions.js

const Cu = Components.utils;

Cu.import("resource://weave/util.js");
Cu.import("resource://weave/async.js");

Function.prototype.async = Async.sugar;

function thirdGen() {
  let self = yield;

  Utils.makeTimerForCall(self.cb);
  yield;

  throw new Error("intentional failure");
}

function secondGen() {
  let self = yield;

  thirdGen.async({}, self.cb);
  try {
    let result = yield;
  } catch (e) {
    do_check_eq(e.message, "Error: intentional failure");
    throw e;
  }

  self.done();
}

function runTestGenerator() {
  let self = yield;

  secondGen.async({}, self.cb);
  let wasCaught = false;
  try {
    let result = yield;
  } catch (e) {
    do_check_eq(e.message, "Error: intentional failure");
    wasCaught = true;
  }

  do_check_true(wasCaught);
  self.done();
}

var run_test = makeAsyncTestRunner(runTestGenerator);