Beginning of igh-level tests for pickling.

patsy/test_pickling.py

@@ -0,0 +1,22 @@
+from six.moves import cPickle as pickle
+
+from patsy import EvalFactor
+
+stuff = [
+    EvalFactor("a+b"),
+    ]
+
+def test_pickling_roundtrips():
+    for obj in stuff:
+        assert obj == pickle.loads(pickle.dumps(obj, pickle.HIGHEST_PROTOCOL))
+
+def test_unpickling_future_gives_sensible_error_msg():
+    pass
+
+# Entrypoint: python -m patsy.test_pickling ...
+
+if __name__ == "__main__":
+    # TODO Save pickle. Make sure it's running from the right directory, so
+    # the pickles are saved in the right place.
+
+