How to use _check_external_allowed_and_warn method in tox

Best Python code snippet using tox_python

venv.py

Source:venv.py

...90        path = self._venv_lookup(name)91        if path is None:92            path = self._normal_lookup(name)93            if path is not None:94                self._check_external_allowed_and_warn(path)95        return path96    def _venv_lookup(self, name):97        return py.path.local.sysfind(name, paths=[self.envconfig.envbindir])98    def _normal_lookup(self, name):99        return py.path.local.sysfind(name)100    def _check_external_allowed_and_warn(self, path):101        if not self.is_allowed_external(path):102            self.session.report.warning(103                "test command found but not installed in testenv\n"104                "  cmd: %s\n"105                "  env: %s\n"106                "Maybe you forgot to specify a dependency? "107                "See also the whitelist_externals envconfig setting." % (108                    path, self.envconfig.envdir))109    def is_allowed_external(self, p):110        tryadd = [""]111        if sys.platform == "win32":112            tryadd += [113                os.path.normcase(x)114                for x in os.environ['PATHEXT'].split(os.pathsep)...

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