Just an hour or so ago, support landed on mozilla-central which gives us
the ability to use the devtools debugger to debug xpcshell tests \o/
To use this, simply add "--jsdebugger" to the xpcshell/mach command-line
- eg:
./mach xpcshell-test --jsdebugger path/to/a/test.js
then wait for the xpcshell process to start and to output a message
indicating it is waiting for the debugger. Then from a (nightly,
non-e10s - see below) Firefox instance, use devtools->connect to connect
to the xpcshell process. WebIDE should also work.
Caveats:
* You can only use this to debug a single test, so specifying (eg) a
directory of tests isn't going to work (you'll get an error starting the
xpcshell process)
* Unrelated to this change, the devtools code recently changed such that
earlier devtools clients can't debug newer servers - see bug 905700 and
bug 1105493 - there's some talk of uplifting, but for now you need to
use a Nightly Firefox to connect to the xpcshell tests. Also, last I
checked things didn't work with e10s - so you need a Nightly with e10s
disabled.
* There remain a few paper-cuts (eg, the "console" might not fully work)
but in general, the debugger itself works fine.
Thanks to :gps for getting this ball rolling many months ago, and
particularly to :past who patiently helped with the devtools magic that
was necessary to get this working.
Spread the word!
Mark
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