Added FakeDirectory.ordered_dirs

- see #151

Author: mrbean-bremen

fake_filesystem_test.py

@@ -149,6 +149,16 @@ def testDirectoryInode(self):
         dir_obj.SetIno(43)
         self.assertEqual(43, fake_os.stat(dirpath)[stat.ST_INO])
 
+    def testOrderedDirs(self):
+        filesystem = fake_filesystem.FakeFilesystem(path_separator='/')
+        filesystem.CreateDirectory('/foo')
+        filesystem.CreateFile('/foo/2')
+        filesystem.CreateFile('/foo/4')
+        filesystem.CreateFile('/foo/1')
+        filesystem.CreateFile('/foo/3')
+        fake_dir = filesystem.GetObject('/foo')
+        self.assertEqual(['2', '4', '1', '3'], fake_dir.ordered_dirs)
+
 
 class SetLargeFileSizeTest(FakeDirectoryUnitTest):
     def testShouldThrowIfSizeIsNotInteger(self):

pyfakefs/fake_filesystem.py

@@ -427,6 +427,11 @@ def contents(self):
         """Return the list of contained directory entries."""
         return self.byte_contents
 
+    @property
+    def ordered_dirs(self):
+        """Return the list of contained directory entry names ordered by creation order."""
+        return [item[0] for item in sorted(self.byte_contents.items(), key=lambda entry: entry[1].st_ino)]
+
     def AddEntry(self, path_object):
         """Adds a child FakeFile to this directory.