getting AssertionError stack traces in server code

[welelay]

Hi,
I'm writing server-side tests by calling

server.execute(function(){
 var a = doSomething();
 expect(a).to.exist;
 var b = doSomethingWithA(a);
 expect(b).to.exist;
});

Guess what ? I get an AssertionError "expected undefined should exist"
What's the culprit: var a= or var b= ?
No way to tell.

So I've dug in the gagarin codebase and added

chai.Assertion.includeStack = true;

at backdoor.js:15

and

  console.log("COMPILED", code);

to the compile() function also in backdoor.js.

Now I get:

server  COMPILED function (chai, Fiber, expect, assert, either) {
 server    return function () {
 server      'use strict';
 server      return (function (userFunc, getClosure, action) {
 server        try {
 server          console.log(action);
 server          return action(userFunc, getClosure);
 server        } catch (err) {
 server          console.error('ERR', err);
 server          return { error: err.message, stack: err.stack, closure: getClosure() };
 server        }
 server      })(
 server        function () {
server                var a = doSomething();
server                expect(a).to.exist;
server                var b = doSomethingWithA(a);
server                expect(b).to.exist;       },
 server        function () {
 server          return {  };
 server        },
 server        arguments[arguments.length-1]
 server      );
 server    }
 server  }

and

AssertionError: expected undefined to exist\n    at [object Object].<anonymous> (...chai/core/assertions.js:340:10)\n    at [object Object].Object.defineProperty.get (..chai/utils/addProperty.js:35:29)\n    at Object.<anonymous> (evalmachine.<anonymous>:15:32)\n    at packages/anti_gagarin/meteor/backdoor.js:44:1\n    at userId (evalmachine.<anonymous>:7:16)\n    at Object.<anonymous> (evalmachine.<anonymous>:12:7)\n    at [object Object].Meteor.methods./gagarin/execute (packages/anti_gagarin/meteor/backdoor.js:42:1)\n    at [object Object].methodMap.(anonymous function) (packages/meteorhacks_kadira/lib/hijack/wrap_session.js:164:1)\n    at maybeAuditArgumentChecks (livedata_server.js:1698:12)\n    at livedata_server.js:708:19

So I can count lines and deduce that the line in error is var b=.
How can I automate this?

[welelay]

I've hacked something in #137.
I'll test it some more...

[apendua]

It's a very important problem you are pointing out here. I've been working on this some time ago and eventually gave up because it turned out stack traces are totally unpredictable in browsers when it comes to evaluating dynamically included code like in our case. So I gave up, but it's probably something that will need to be solved eventually. Please let me know about the results of your research.

[welelay]

Good to know.
I've not tackled the browser.execute() stacktraces yet.
The latest commit in the PR is for server.execute(), though.
Maybe it's more reliable...

[apendua]

Issue #52 is related.