Added support for fake os.path.samefile

- fixes pytest-dev#193

CHANGES.md

@@ -4,6 +4,7 @@ The release versions are PyPi releases.
 ## Version 3.3 (as yet unreleased)
 
 #### New Features
+  * Added fake `os.path.samefile` implementation ([#193](../../issues/193))
 
 #### Infrastructure
 

fake_filesystem_test.py

@@ -2625,6 +2625,17 @@ def testRealpathVsAbspath(self):
         self.assertEqual('!george!washington!bridge',
                          self.os.path.realpath('bridge'))
 
+    @unittest.skipIf(TestCase.is_windows and sys.version_info < (3,2),
+                     'No Windows support before 3.2')
+    def testSamefile(self):
+        file_path1 = '!foo!bar!baz'
+        file_path2 = '!foo!bar!boo'
+        self.filesystem.CreateFile(file_path1)
+        self.filesystem.CreateFile(file_path2)
+        self.assertTrue(self.path.samefile(file_path1, file_path1))
+        self.assertFalse(self.path.samefile(file_path1, file_path2))
+        self.assertTrue(self.path.samefile(file_path1, '!foo!..!foo!bar!..!bar!baz'))
+
     def testExists(self):
         file_path = 'foo!bar!baz'
         self.filesystem.CreateFile(file_path)

pyfakefs/fake_filesystem.py

@@ -2681,6 +2681,23 @@ def realpath(self, filename):
         path, ok = self._joinrealpath(filename[:0], filename, {})
         return self.abspath(path)
 
+    if sys.platform != 'win32' or sys.version_info >= (3, 2):
+        def samefile(self, path1, path2):
+            """Return whether path1 and path2 point to the same file.
+            Windows support new in Python 3.2.
+            New in pyfakefs 3.3.
+
+            Args:
+                path1: first file path or path object (Python >=3.6)
+                path2: second file path or path object (Python >=3.6)
+
+            Raises:
+              OSError: if one of the paths does not point to an existing file system object.
+            """
+            stat1 = self.filesystem.GetStat(path1)
+            stat2 = self.filesystem.GetStat(path2)
+            return stat1.st_ino == stat2.st_ino and stat1.st_dev == stat2.st_dev
+
     def _joinrealpath(self, path, rest, seen):
         """Join two paths, normalizing and eliminating any symbolic links
         encountered in the second path.