Commits on May 12, 2016

1. Handle SystemExit also when calling _run_pytest_collect …

   This might happen for e.g. `ptw -- --vv`, where `--vv` is an invalid
   option for `py.test`.
   
   ```
   [0]   …/pyenv/project/bin/ptw(9)<module>()
   -> load_entry_point('pytest-watch', 'console_scripts', 'ptw')()
   [1]   …/pytest-watch/pytest_watch/command.py(85)main()
   -> if not merge_config(args, pytest_args, verbose=args['--verbose']):
   [2]   …/pytest-watch/pytest_watch/config.py(86)merge_config()
   -> config_path = _collect_config(pytest_args, silent)
   [3]   …/pytest-watch/pytest_watch/config.py(68)_collect_config()
   -> return _run_pytest_collect(pytest_args)
   [4]   …/pytest-watch/pytest_watch/config.py(52)_run_pytest_collect()
   -> exit_code = pytest.main(argv, plugins=[collect_config_plugin])
   …
   [20]   …/pyenv/project/lib/python3.5/site-packages/_pytest/config.py(726)parse_args()
   -> self.error('\n'.join(lines))
   [21] > /usr/lib64/python3.5/argparse.py(2385)error()
   -> self.exit(2, _('%(prog)s: error: %(message)s\n') % args)
   [22]   /usr/lib64/python3.5/argparse.py(2372)exit()
   -> _sys.exit(status)
   ```
   
   Now it will look like this, which is still a bit confusing, since it
   refers to `ptw` and not `py.test`:
   
   > Error: Could not run --collect-only to find the pytest config file. Trying again without silencing stdout...
   > usage: ptw [options] [file_or_dir] [file_or_dir] [...]
   > ptw: error: unrecognized arguments: --vv
   >   inifile: …/project/setup.cfg
   >   rootdir: …/project/project

   

   blueyed committed May 12, 2016
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