refactored, 1 failing test

vcr/persisters/filesystem.py

@@ -1,9 +1,18 @@
 import os
+from ..serialize import serialize, deserialize
 
 
 class FilesystemPersister(object):
     @classmethod
-    def write(cls, cassette_path, data):
+    def load_cassette(cls, cassette_path, serializer):
+        with open(cassette_path) as f:
+            cassette_content = f.read()
+        cassette = deserialize(cassette_content, serializer)
+        return cassette
+
+    @staticmethod
+    def save_cassette(cassette_path, cassette_dict, serializer):
+        data = serialize(cassette_dict, serializer)
         dirname, filename = os.path.split(cassette_path)
         if dirname and not os.path.exists(dirname):
             os.makedirs(dirname)