How to use the tox.cmdline function in tox

def run_tests(self):
        import tox
        errno = tox.cmdline(self.tox_args)
        sys.exit(errno)

def run_tests(self):
        import tox
        tox.cmdline(self.test_args)

def run_tests(self):
        # import here, cause outside the eggs aren't loaded
        import tox
        errno = tox.cmdline(self.test_args)
        sys.exit(errno)

def run_tests(self):
        # import here, cause outside the eggs aren't loaded
        import tox
        import shlex

        args = self.tox_args
        if args:
            args = shlex.split(self.tox_args)
        errno = tox.cmdline(args=args)
        sys.exit(errno)

def run_tests(self):
        # import here, cause outside the eggs aren't loaded
        import tox
        errno = tox.cmdline(self.test_args)
        sys.exit(errno)

def run_tests(self):
        import tox  # import here, cause outside the eggs aren't loaded
        import shlex
        args = self.tox_args
        if args:
            args = shlex.split(self.tox_args)
        errno = tox.cmdline(args=args)
        sys.exit(errno)

def run_tests(self):
        # Import here since eggs aren't loaded outside of this scope
        import tox
        import shlex

        args = self.tox_args
        if args:
            args = shlex.split(self.tox_args)

        errno = tox.cmdline(args=args)
        sys.exit(errno)

def run_tests(self):
        import tox
        errno = tox.cmdline(self.test_args)
        sys.exit(errno)

def run_tests(self):
        import tox
        tox.cmdline()

def run_tests(self):
        # Import here, cause outside the eggs aren't loaded
        import tox

        # Raises SystemExit
        tox.cmdline(self.test_args)