bpo-38811: Check for presence of os.link method in pathlib. (GH-17170)

Fix also the Path.symplink() method implementation for the case when
symlinks are not supported.

1 files changed, 19 insertions, 0 deletions

diff --git a/Lib/test/test_pathlib.py b/Lib/test/test_pathlib.py
index 058a201..d05b956 100644
--- a/Lib/test/test_pathlib.py
+++ b/Lib/test/test_pathlib.py
@@ -1759,6 +1759,7 @@ class _BasePathTest(object):
         self.assertFileNotFound(p.stat)
         self.assertFileNotFound(p.unlink)
 
+    @unittest.skipUnless(hasattr(os, "link"), "os.link() is not present")
     def test_link_to(self):
         P = self.cls(BASE)
         p = P / 'fileA'
@@ -1778,6 +1779,15 @@ class _BasePathTest(object):
         self.assertEqual(os.stat(r).st_size, size)
         self.assertTrue(q.stat)
 
+    @unittest.skipIf(hasattr(os, "link"), "os.link() is present")
+    def test_link_to_not_implemented(self):
+        P = self.cls(BASE)
+        p = P / 'fileA'
+        # linking to another path.
+        q = P / 'dirA' / 'fileAA'
+        with self.assertRaises(NotImplementedError):
+            p.link_to(q)
+
     def test_rename(self):
         P = self.cls(BASE)
         p = P / 'fileA'
@@ -2011,6 +2021,15 @@ class _BasePathTest(object):
         self.assertTrue(link.is_dir())
         self.assertTrue(list(link.iterdir()))
 
+    @unittest.skipIf(support.can_symlink(), "symlink support is present")
+    def test_symlink_to_not_implemented(self):
+        P = self.cls(BASE)
+        target = P / 'fileA'
+        # Symlinking a path target.
+        link = P / 'dirA' / 'linkAA'
+        with self.assertRaises(NotImplementedError):
+            link.symlink_to(target)
+
     def test_is_dir(self):
         P = self.cls(BASE)
         self.assertTrue((P / 'dirA').is_dir())