Patch 1339796: add a relpath() function to os.path.

1 files changed, 12 insertions, 1 deletions

diff --git a/Lib/test/test_posixpath.py b/Lib/test/test_posixpath.py
index 5632dcc..e2adb34 100644
--- a/Lib/test/test_posixpath.py
+++ b/Lib/test/test_posixpath.py
@@ -2,7 +2,7 @@ import unittest
 from test import test_support
 
 import posixpath, os
-from posixpath import realpath, abspath, join, dirname, basename
+from posixpath import realpath, abspath, join, dirname, basename, relpath
 
 # An absolute path to a temporary filename for testing. We can't rely on TESTFN
 # being an absolute path, so we need this.
@@ -479,6 +479,17 @@ class PosixPathTest(unittest.TestCase):
                 safe_rmdir(ABSTFN + "/k")
                 safe_rmdir(ABSTFN)
 
+    def test_relpath(self):
+        currentdir = os.path.split(os.getcwd())[-1]
+        self.assertRaises(ValueError, posixpath.relpath, "")
+        self.assertEqual(posixpath.relpath("a"), "a")
+        self.assertEqual(posixpath.relpath(os.path.abspath("a")), "a")
+        self.assertEqual(posixpath.relpath("a/b"), "a/b")
+        self.assertEqual(posixpath.relpath("../a/b"), "../a/b")
+        self.assertEqual(posixpath.relpath("a", "../b"), "../"+currentdir+"/a")
+        self.assertEqual(posixpath.relpath("a/b", "../c"), "../"+currentdir+"/a/b")
+        self.assertEqual(posixpath.relpath("a", "b/c"), "../../a")
+
 def test_main():
     test_support.run_unittest(PosixPathTest)