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Re: Review of tests upstreamed by implementors

From: Ms2ger <ms2ger@gmail.com>
Date: Thu, 21 Mar 2013 20:18:46 +0100
Message-ID: <514B5D16.1030007@gmail.com>
To: James Graham <jgraham@opera.com>
CC: Robin Berjon <robin@w3.org>, Dirk Pranke <dpranke@chromium.org>, public-test-infra <public-test-infra@w3.org>
FWIW, a few notes on my experience running W3C tests in Mozilla's 
automation:

On 03/21/2013 02:11 PM, James Graham wrote:
> Assuming that implementors actually want to import and run the tests,
> there are a number of practical issues that they face. The first is
> simply that they must sync the external repository with the one in which
> they keep their tests. That's pretty trivial if you run git and pretty
> much a headache if you don't. So for most vendors at the moment it's a
> headache.

I've written a script to pull the tests into our HG repository; this is 
pretty trivial for us too.

> Once you have imported the tests, it must be possible to tell which
> files you should actually load and what system should be used to get
> results (i.e., given a is it a reftest, is it a testharness test, is it
> a manual test, is it a support file? Is the url to load the file
> actually the url to the test or is there a query/fragment part? Is there
> an optional query/fragment part that changes the details of the test?).
> There have been several suggestions for solutions to these problems, but
> there is no actual solution at the moment.

The solution we use is the MANIFEST files checked into the repositories; 
there's documentation at [2].

> Many vendor's systems are designed around the assumption that "all tests
> must pass" and, for the rare cases where tests don't pass, one is
> expected to manually annotate the test as failing. This is problematic
> if you suddenly import 10,000 tests for a feature that you haven't
> implemented yet. Or even 100 tests of which 27 fail. I don't have a good
> solution for this other than "don't design your test system like that"
> (which is rather late). I presume the answer will look something like a
> means of auto-marking tests as expected-fail on their first run after
> import.

Tools save us here as well. It's not yet as easy as I'd like, but it 
involves not all that much more than running the tests and running a 
script on the output.

> We also have the problem that many of the tests simply won't run in
> vendor's systems. Tests that require an extra server to be set up (e.g.
> websockets tests) are a particular problem, but they are rare. More
> problematic is that many people can't run tests that depend on
> Apache+PHP (because they run all the servers on the individual test node
> and don't have Apache+PHP in that environment). Unless everyone is happy
> to deploy something as heavyweight as Apache+PHP, we may need to
> standardise on a diffferent solution for tests that require custom
> server-side logic. Based on previous discussions, this would likely be a
> custom Python-based server, with special features for testing (I believe
> Chrome/WebKit already have something like this?).

I don't expect Apache+PHP to work for Mozilla; a custom Python server 
would probably be workable.

> One final issue (that I can think of right now ;) is that it must be
> possible for everyone to *run* the tests and get results out. This
> should in theory be rather easy since one can implement a custom
> testharnessreport.js for javascript tests, and people already know how
> to run reftests. But sometimes the details of people's testing systems
> are very specialised in strange ways so this can be a larger barrier
> than you might assume.

I didn't really hit problems here.

The one other issue we have is tests timing out; I haven't been able to 
figure out yet if that's due to test, test harness or implementation bugs.

HTH
Ms2ger

> [1]
> https://developer.mozilla.org/en-US/docs/Mozilla/QA/Avoiding_intermittent_oranges

[2] 
https://bitbucket.org/ms2ger/test-runner/src/3d9052f852abf69f8c449aebfe203834f1cfca55/manifests.txt?at=default
Received on Thursday, 21 March 2013 19:19:17 UTC

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