add method AtLocation.as_emptypath for cloning a location

1 files changed, 19 insertions, 1 deletions

diff --git a/tests/test_atlocation.py b/tests/test_atlocation.py
index 9836f3b..5d7286a 100644
--- a/tests/test_atlocation.py
+++ b/tests/test_atlocation.py
@@ -80,7 +80,7 @@ class AtLocationTest(unittest.TestCase):
     def create_all(
         self, skip: typing.Container[str] = ()
     ) -> typing.Iterator[tuple[str, typing.ContextManager[AtLocation]]]:
-        """Create various AtLocation objects referring to fils, directories
+        """Create various AtLocation objects referring to files, directories
         and other things in various ways.
         """
         for loctype in ("relative", "absolute", "emptypath", "withfd"):
@@ -146,6 +146,24 @@ class AtLocationTest(unittest.TestCase):
             self.assertEqual(atloc.access(os.R_OK), should_exist)
         self.assertEqual(atloc.exists(), should_exist)
 
+    def test_as_emptypath(self) -> None:
+        atloc = AtLocation(self.tempdir)
+        self.assertFalse(atloc.flags & linuxnamespaces.AtFlags.AT_EMPTY_PATH)
+        statres = atloc.stat()
+        atloc_ep = self.enterContext(atloc.as_emptypath())
+        self.assertTrue(atloc_ep.flags & linuxnamespaces.AtFlags.AT_EMPTY_PATH)
+        self.assertGreaterEqual(atloc_ep.fd, 0)
+        self.assertEqual(atloc_ep.location, "")
+        self.assertEqual(atloc_ep.stat().st_ino, statres.st_ino)
+        atloc_dup = self.enterContext(atloc_ep.as_emptypath())
+        self.assertTrue(
+            atloc_dup.flags & linuxnamespaces.AtFlags.AT_EMPTY_PATH
+        )
+        self.assertGreaterEqual(atloc_ep.fd, 0)
+        self.assertNotEqual(atloc_dup.fd, atloc_ep.fd)
+        self.assertEqual(atloc_dup.location, "")
+        self.assertEqual(atloc_dup.stat().st_ino, statres.st_ino)
+
     @atloc_subtest(skip=("absent", "file", "symlink"))
     def test_join_mkdir(self, _: str, atloc: AtLocation) -> None:
         subdir = atloc / "subdir"