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tox creates a virtualenv in .tox/py27 which you should activate for
debugging. Then use nosetests for running the test(s) in the debugger. Note,
with nosetests you must use a colon when splitting from the module to the
class level.

  $ source .tox/py27/bin/activate
  (py27)$ python -m pdb .tox/py27/bin/nosetests
quantum.tests.unit.test_debug_commands:TestDebugCommands

For some set_trace() tips, see
http://stackoverflow.com/questions/4950637/setting-breakpoints-with-nosetests-pdb-option

-- Henry

On Fri, Jun 07, at 7:32 pm, Jason Zhang <bearovercloud at gmail.com> wrote:
> Hi,
>
> I'd like to debug the quantum unit test case using the pdb, but it looks
> like I got the errors regarding the
> stdin/stdout for i/o of pdb when I run the command as followings,
>
> tox -e py27 -- quantum.tests.unit.test_debug_commands.TestDebugCommandsShell
>
> Traceback (most recent call last):
>   File "/opt/stack/quantum/quantum/tests/unit/test_debug_commands.py", line 417, in test_initialize_app_help_return
>     sh.run(argv)
>   File "/opt/stack/quantum/quantum/tests/unit/test_debug_commands.py", line 417, in test_initialize_app_help_return
>     sh.run(argv)
>   File "/usr/lib/python2.7/bdb.py", line 48, in trace_dispatch
>     return self.dispatch_line(frame)
>   File "/usr/lib/python2.7/bdb.py", line 67, in dispatch_line
>     if self.quitting: raise BdbQuit
> BdbQuit
>
>