"mach mochitest --appname dist" only works if "mach package" has been ran before. If somehow a clobber occured I need to remember to "mach package" again. If I forget, the unhelpful error message I get is the following: $ ./mach mochitest --appname dist browser/base/content/test/static/browser_all_files_referenced.js cat: backend.TestManifestBackend.in: No such file or directory Build configuration changed. Regenerating backend. ###### ### Now running mochitest-browser. ###### Error running mach: ['mochitest', '--appname', 'dist', 'browser/base/content/test/static/browser_all_files_referenced.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: Exception: Binary expected at /Users/florian/buildhg/mozilla/obj-browser/dist/firefox/Nightly.app/Contents/MacOS/firefox does not exist. File "/Users/florian/buildhg/mozilla/testing/mochitest/mach_commands.py", line 408, in run_mochitest_general **harness_args) File "/Users/florian/buildhg/mozilla/testing/mochitest/mach_commands.py", line 158, in run_desktop_test result = mochitest.run_test_harness(parser, options) File "/Users/florian/buildhg/mozilla/obj-browser/_tests/testing/mochitest/runtests.py", line 2751, in run_test_harness parser.validate(options) File "/Users/florian/buildhg/mozilla/obj-browser/_tests/testing/mochitest/mochitest_options.py", line 1104, in validate args = container.validate(self, args, self.context) File "/Users/florian/buildhg/mozilla/obj-browser/_tests/testing/mochitest/mochitest_options.py", line 639, in validate options.app = build_obj.get_binary_path(where='staged-package') File "/Users/florian/buildhg/mozilla/python/mozbuild/mozbuild/base.py", line 336, in get_binary_path raise Exception('Binary expected at %s does not exist.' % path) I think in that case mach should either say "please run mach package", or even better just do it automatically.
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