How to use the prospector.pathutils.is_virtualenv function in prospector

def test_is_a_venv(self):
        path = os.path.join(os.path.dirname(__file__), 'testdata', 'venvs', 'is_a_venv')
        self.assertTrue(is_virtualenv(path))

def test_long_path_not_a_venv(self):
        """
        Windows doesn't allow extremely long paths. This unit test has to be
        run in Windows to be meaningful, though it shouldn't fail in other
        operating systems.
        """
        path = [os.path.dirname(__file__), 'testdata', 'venvs']
        path.extend(['long_path_not_a_venv'] * 14)
        path.append('long_path_not_a_venv_long_path_not_a_v')
        path = os.path.join(*path)
        self.assertFalse(is_virtualenv(path))

def test_not_a_venv(self):
        path = os.path.join(os.path.dirname(__file__), 'testdata', 'venvs', 'not_a_venv')
        self.assertFalse(is_virtualenv(path))

ignored = any([m.search(relpath) for m in ignore])

        if os.path.isdir(fullpath):
            split_fullpath = fullpath.split(os.path.sep)

            # node_modules should be ignored
            if 'node_modules' in split_fullpath:
                continue

            # __pycache__ should also be skipped
            if '__pycache__' in split_fullpath:
                continue

            # is it probably a virtualenvironment?
            if is_virtualenv(fullpath) or '.tox' in fullpath:
                continue

            # this is a directory
            directories.append((relpath, ignored))

            # is it also a package?
            initpy = os.path.join(fullpath, '__init__.py')
            if os.path.exists(initpy) and os.path.isfile(initpy):
                packages.append((relpath, ignored))

            # do the same for this directory
            recurse = _find_paths(ignore, os.path.join(curpath, filename), rootpath)
            files += recurse[0]
            modules += recurse[1]
            packages += recurse[2]
            directories += recurse[3]