Make sure fake DirEntry implements os.PathLike if needed

- for Python >= 3.6 and if using os.scandir
  (e.g. not the scandir package)
- fixes #483

CHANGES.md

@@ -14,6 +14,8 @@ The release versions are PyPi releases.
   * added basic support for `os.pipe` (see [#473](../../issues/473))
 
 #### Fixes
+  * fake `DirEntry` now implements `os.PathLike` in Python >= 3.6
+    (see [#483](../../issues/483))
   * fixed incorrect argument name for `os.makedirs` 
     (see [#481](../../issues/481))
   * avoid pytest warning under Python 2.7 (see [#466](../../issues/466))

pyfakefs/fake_scandir.py

@@ -16,12 +16,18 @@
 and the standalone function available in the standalone `scandir` python
 package.
 """
+import os
 import sys
 
-from pyfakefs.extra_packages import use_scandir_package
+from pyfakefs.extra_packages import use_scandir_package, use_builtin_scandir
 
+if sys.version_info >= (3, 6) and use_builtin_scandir:
+    BaseClass = os.PathLike
+else:
+    BaseClass = object
 
-class DirEntry(object):
+
+class DirEntry(BaseClass):
     """Emulates os.DirEntry. Note that we did not enforce keyword only
     arguments."""
 
@@ -101,6 +107,10 @@ def stat(self, follow_symlinks=True):
             self._statresult = file_object.stat_result.copy()
         return self._statresult
 
+    if sys.version_info >= (3, 6) and use_builtin_scandir:
+        def __fspath__(self):
+            return self.path
+
 
 class ScanDirIter:
     """Iterator for DirEntry objects returned from `scandir()`

pyfakefs/tests/fake_os_test.py

@@ -25,7 +25,9 @@
 
 from pyfakefs import fake_filesystem
 from pyfakefs.fake_filesystem import FakeFileOpen, is_root
-from pyfakefs.extra_packages import use_scandir, use_scandir_package
+from pyfakefs.extra_packages import (
+    use_scandir, use_scandir_package, use_builtin_scandir
+)
 
 from pyfakefs.tests.test_utils import DummyTime, TestCase, RealFsTestCase
 
@@ -4823,6 +4825,13 @@ def test_stat_ino_dev(self):
             self.assertEqual(file_stat.st_dev,
                              self.dir_entries[3].stat().st_dev)
 
+    @unittest.skipIf(sys.version_info < (3, 6) or not use_builtin_scandir,
+                     'Path-like objects have been introduced in Python 3.6')
+    def test_path_like(self):
+        self.assertTrue(isinstance(self.dir_entries[0], os.PathLike))
+        self.assertEqual(self.dir_path, os.fspath(self.dir_entries[0]))
+        self.assertEqual(self.file_path, os.fspath(self.dir_entries[1]))
+
 
 class RealScandirTest(FakeScandirTest):
     def use_real_fs(self):

pyfakefs/tests/test_utils.py

@@ -369,8 +369,8 @@ def setUp(self):
             self.open = fake_filesystem.FakeFileOpen(self.filesystem)
             self.os = fake_filesystem.FakeOsModule(self.filesystem)
             self.create_basepath()
-        elif not os.environ.get('TEST_REAL_FS'):
-            self.skip_real_fs()
+        # elif not os.environ.get('TEST_REAL_FS'):
+        #     self.skip_real_fs()
 
         self.setUpFileSystem()