Fix OSError subtype raised under MacOS on os.chdir with file decscriptor

pyfakefs/fake_filesystem.py

@@ -3703,8 +3703,13 @@ def chdir(self, path):
             OSError: if user lacks permission to enter the argument directory
                 or if the target is not a directory.
         """
-        path = self.filesystem.resolve_path(
-            path, allow_fd=True)
+        try:
+            path = self.filesystem.resolve_path(
+                path, allow_fd=True)
+        except OSError as exc:
+            if self.filesystem.is_macos and exc.errno == errno.EBADF:
+                raise OSError(errno.ENOTDIR, "Not a directory: " + str(path))
+            raise
         self.filesystem.confirmdir(path)
         directory = self.filesystem.resolve(path)
         # A full implementation would check permissions all the way

pyfakefs/tests/fake_open_test.py

@@ -1726,7 +1726,8 @@ def test_chdir_uses_open_fd_as_path(self):
         if self.is_pypy:
             # unclear behavior with PyPi
             self.skip_real_fs()
-        self.assert_raises_os_error(errno.EBADF, self.os.chdir, 10)
+        error = errno.ENOTDIR if self.is_macos else errno.EBADF
+        self.assert_raises_os_error(error, self.os.chdir, 10)
         dir_path = self.make_path('foo', 'bar')
         self.create_dir(dir_path)