django/tests/utils_tests/test_os_utils.py

import os
import unittest

from django.core.exceptions import SuspiciousFileOperation
from django.utils._os import safe_join


class SafeJoinTests(unittest.TestCase):
    def test_base_path_ends_with_sep(self):
        drive, path = os.path.splitdrive(safe_join("/abc/", "abc"))
        self.assertEqual(
            path,
            "{0}abc{0}abc".format(os.path.sep)
        )

    def test_root_path(self):
        drive, path = os.path.splitdrive(safe_join("/", "path"))
        self.assertEqual(
            path,
            "{}path".format(os.path.sep),
        )

        drive, path = os.path.splitdrive(safe_join("/", ""))
        self.assertEqual(
            path,
            os.path.sep,
        )

    def test_parent_path(self):
        with self.assertRaises(SuspiciousFileOperation):
            safe_join("/abc/", "../def")