Trying to run mochtests, I get this: $ mach mochitest-browser toolkit/devtools/server/tests/browser/browser_storage_dynamic_windows.js From _tests: Kept 15337 existing; Added/updated 3; Removed 0 files and 0 directories. 0:11.73 MochitestServer : launching [u'c:\\fx-team\\firefox\\dist\\bin\\xpcshell.exe', '-g', u'c:\\fx-team\\firefox\\dist\\bin', '-v', '170', '-f', 'c:\\fx-team\\firefox\\_tests\\testing\\mochites t/httpd.js', '-e', "const _PROFILE_PATH = 'c:\\\\users\\\\girish~1\\\\appdata\\\\local\\\\temp\\\\tmp8atzkz'; const _SERVER_PORT = '8888'; const _SERVER_ADDR = '127.0.0.1'; const _TEST_PREFIX = und efined; const _DISPLAY_RESULTS = false;", '-f', './server.js'] 0:11.73 runtests.py | Server pid: 9260 0:12.73 runtests.py | Websocket server pid: 10864 Error running mach: ['mochitest-browser', 'toolkit/devtools/server/tests/browser/browser_storage_dynamic_windows.js'] The error occurred in code that was called by the mach command. This is either a bug in the called code itself or in the way that mach is calling it. You should consider filing a bug for this issue. If filing a bug, please include the full output of mach, including this error message. The details of the failure are as follows: TypeError: coercing to Unicode: need string or buffer, TestManifest found File "c:\fx-team\testing/mochitest/mach_commands.py", line 587, in run_mochitest_browser return self.run_mochitest(test_paths, 'browser', **kwargs) File "c:\fx-team\testing/mochitest/mach_commands.py", line 628, in run_mochitest test_paths=test_paths, suite=flavor, **kwargs) File "c:\fx-team\testing/mochitest/mach_commands.py", line 369, in run_desktop_test result = runner.runTests(options) File "c:\fx-team\firefox\_tests\testing\mochitest\runtests.py", line 1092, in runTests testURL = self.buildTestPath(options) File "c:\fx-team\firefox\_tests\testing\mochitest\runtests.py", line 437, in buildTestPath if options.manifestFile and os.path.isfile(options.manifestFile): File "c:\mozilla-build\python\lib\genericpath.py", line 29, in isfile st = os.stat(path)

I'll work on this ASAP since I'm responsible, since it blocks others, and since it should be little effort.

Is your tree fully built? You told me on IRC this was an issue with 722363d66998. But the line numbers and source code don't line up to what's actually in that revision. https://hg.stage.mozaws.net/gecko/file/722363d66998/testing/mochitest/runtests.py#l431 Specifically, there is no "if options.manifestFile and os.path.isfile" any more. There *was* before bug 987398. https://hg.stage.mozaws.net/gecko/rev/b151f7bd1c10#l2.1 I think your runtests.py in your objdir is out of date. Performing a full build should bring it up to date. Reopen if I'm wrong.

ok, worked after mach build. Actually I passed the wrong hg identity, I had already done hg pull -u before you asked for hg identity.