DEBUG:quibble.cmd:Running stages: selenium
WARNING:quibble.cmd:ZUUL_PROJECT not set. Assuming mediawiki/core
INFO:quibble.cmd:Adding mediawiki/vendor
INFO:quibble.cmd:Projects: mediawiki/core, mediawiki/skins/Vector, mediawiki/vendor
DEBUG:quibble.cmd:Execution plan:
--- Logging error ---
Traceback (most recent call last):
  File "/usr/lib/python3.5/logging/__init__.py", line 981, in emit
    msg = self.format(record)
  File "/usr/lib/python3.5/logging/__init__.py", line 831, in format
    return fmt.format(record)
  File "/usr/lib/python3.5/logging/__init__.py", line 568, in format
    record.message = record.getMessage()
  File "/usr/lib/python3.5/logging/__init__.py", line 329, in getMessage
    msg = str(self.msg)
  File "/usr/local/lib/python3.5/dist-packages/quibble-0.0.0-py3.5.egg/quibble/commands.py", line 45, in __str__
    self.kwargs)
AttributeError: 'ZuulCloneCommand' object has no attribute 'kwargs'
Call stack:
  File "/usr/local/bin/quibble", line 11, in <module>
    load_entry_point('quibble==0.0.0', 'console_scripts', 'quibble')()
  File "/usr/local/lib/python3.5/dist-packages/quibble-0.0.0-py3.5.egg/quibble/cmd.py", line 443, in main
    cmd.execute(plan)
  File "/usr/local/lib/python3.5/dist-packages/quibble-0.0.0-py3.5.egg/quibble/cmd.py", line 414, in execute
    self.log.debug(cmd)
Message: <quibble.commands.ZuulCloneCommand object at 0x7fd7273b7ac8>
Arguments: ()
DEBUG:quibble.cmd:Extension and skin submodule update under MediaWiki root /workspace/src
DEBUG:quibble.cmd:Install MediaWiki, db=mysql db_dir=None vendor=True
DEBUG:quibble.cmd:Install composer dev-requires
DEBUG:quibble.cmd:npm install in /workspace/src
DEBUG:quibble.cmd:Run tests in mediawiki/core: []
DEBUG:quibble.cmd:Browser tests in /workspace/src: ['selenium (maybe)'] using DISPLAY=None