Closed Bug 1764947 Opened 4 months ago Closed 4 months ago

Can't run mochitests on Windows - AssertionError - assert pathAbs.startswith(self.testRootAbs)


(Testing :: General, defect, P1)



(firefox100+ wontfix, firefox101+ fixed)

101 Branch
Tracking Status
firefox100 + wontfix
firefox101 + fixed


(Reporter: Gijs, Assigned: mhentges)


(Blocks 1 open bug)



(1 file)

$ ./mach test browser/base/content/test/general/browser_unknownContentType_title.js


Test configuration changed. Regenerating backend.
 0:10.21 INFO These variables are available in the mozinfo environment and can be used to skip tests conditionally:
 0:10.21 INFO     a11y_checks: False
 0:10.21 INFO     apple_catalina: False
 0:10.21 INFO     apple_silicon: False
 0:10.21 INFO     appname: firefox
 0:10.21 INFO     artifact: False
 0:10.21 INFO     asan: False
 0:10.21 INFO     automation: False
 0:10.21 INFO     bin_suffix: .exe
 0:10.21 INFO     bits: 64
 0:10.21 INFO     buildapp: browser
 0:10.21 INFO     buildtype_guess: opt
 0:10.21 INFO     cc_type: clang-cl
 0:10.21 INFO     ccov: False
 0:10.21 INFO     crashreporter: True
 0:10.21 INFO     datareporting: True
 0:10.21 INFO     debug: False
 0:10.21 INFO     devedition: False
 0:10.21 INFO     domstreams: True
 0:10.21 INFO     e10s: True
 0:10.21 INFO     early_beta_or_earlier: True
 0:10.21 INFO     fission: True
 0:10.21 INFO     has_sandbox: True
 0:10.21 INFO     headless: False
 0:10.21 INFO     healthreport: True
 0:10.21 INFO     isolated_process: False
 0:10.21 INFO     mozconfig: C:/dev/config/opt
 0:10.21 INFO     nightly_build: True
 0:10.21 INFO     non_native_theme: True
 0:10.21 INFO     normandy: True
 0:10.21 INFO     official: False
 0:10.21 INFO     os: win
 0:10.21 INFO     os_version: 10.0
 0:10.21 INFO     pgo: False
 0:10.21 INFO     platform_guess: win64
 0:10.21 INFO     processor: x86_64
 0:10.21 INFO     release_or_beta: False
 0:10.21 INFO     require_signing: False
 0:10.21 INFO     service_pack:
 0:10.21 INFO     serviceworker_e10s: True
 0:10.21 INFO     sessionHistoryInParent: True
 0:10.21 INFO     socketprocess_e10s: False
 0:10.21 INFO     socketprocess_networking: False
 0:10.21 INFO     stylo: True
 0:10.21 INFO     swgl: False
 0:10.21 INFO     sync: True
 0:10.21 INFO     telemetry: False
 0:10.21 INFO     tests_enabled: True
 0:10.21 INFO     toolkit: windows
 0:10.21 INFO     topsrcdir: C:/dev/mozilla-unified
 0:10.21 INFO     tsan: False
 0:10.21 INFO     ubsan: False
 0:10.21 INFO     updater: True
 0:10.21 INFO     verify: False
 0:10.21 INFO     verify_fission: False
 0:10.21 INFO     version: 10.0.19044
 0:10.21 INFO     webgl_ipc: False
 0:10.21 INFO     win10_2004: False
 0:10.21 INFO     xorigin: False
 0:10.21 INFO Checking for ssltunnel processes...
 0:10.50 INFO Checking for xpcshell processes...
Error running mach:

    ['test', 'browser/base/content/test/general/browser_unknownContentType_title.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 can invoke |./mach busted| to check if this issue is already on file. If it
isn't, please use |./mach busted file test| to report it. If |./mach busted| is
misbehaving, you can also inspect the dependencies of bug 1543241.

If filing a bug, please include the full output of mach, including this error

The details of the failure are as follows:


  File "C:\dev\mozilla-unified\testing\", line 457, in test
    res = command_context._mach_context.commands.dispatch(
  File "C:\dev\mozilla-unified\python\mach\mach\", line 185, in dispatch
    return self._run_command_handler(handler, context, **kwargs)
  File "C:\dev\mozilla-unified\python\mach\mach\", line 118, in _run_command_handler
    result = fn(instance, **kwargs)
  File "C:\dev\mozilla-unified\testing\mochitest\", line 502, in run_mochitest_general
    result = run_mochitest(
  File "C:\dev\mozilla-unified\testing\mochitest\", line 147, in run_desktop_test
    result = mochitest.run_test_harness(parser, options)
  File "c:/dev/builds/opt\_tests\testing\mochitest\", line 3739, in run_test_harness
    result = runner.runTests(options)
  File "c:/dev/builds/opt\_tests\testing\mochitest\", line 3053, in runTests
    tests = self.getActiveTests(options)
  File "c:/dev/builds/opt\_tests\testing\mochitest\", line 1653, in getActiveTests
    assert pathAbs.startswith(self.testRootAbs)

Sentry event ID: a25147c432a54c888d7c3c913cc0b261

This is on current central (7f6fc25d231f) but was also broken on yesterday's central. I believe it used to work. I'm supposed to be on PTO so I don't have much time to investigate further.

The same error appears when passing just a test file name (rather than a full path to a test), a manifest, or a test directory. It also doesn't work with the mach mochitest command.

I thought this used to work but can't be certain if I ran tests after updating to mozillabuild 4.0.

This appears similar to bug 1752315 except I am not using --appname and have already run a complete ./mach build. I tried clobbering, that didn't help either.

Echo'ing that comparison produces:

c:\dev\builds\opt\_tests\testing\mochitest\browser\browser\base\content\test\general\browser_unknownContentType_title.js with C:\dev\builds\opt\_tests\testing\mochitest\browser

So this is yet more fallout from casing of drive letters on Windows.

I don't understand why these failures weren't caught by anyone else.

Something like this:

allows me to run tests locally, at least, though it's probably not the right fix.

MozillaBuild 4.0 changed the default drive letter case to be uppercase,
causing some havoc for in-tree code that assumes that it'll still be

Address this new mismatched expectation with a couple os.path.normcase

This class of issue will be solved in a cleaner, less footgun-y way by
bug 1740564.

(In reply to :Gijs (out, back April 27; he/him) from comment #2)

Something like this:

allows me to run tests locally, at least, though it's probably not the right fix.

I think that's pretty much perfect, though I'm using os.path.normcase() in my patch to be slightly more aligned with Python conventions.

Assignee: nobody → mhentges
Pushed by
Normcase mochitest paths for "parent dir" comparison r=ahal
Closed: 4 months ago
Resolution: --- → FIXED
Target Milestone: --- → 101 Branch
You need to log in before you can comment on or make changes to this bug.