Refactor infra git libs and testing.

infra/libs/git2/data/commit.py

Index: infra/libs/git2/data/commit.py
diff --git a/infra/services/gnumbd/support/data.py b/infra/libs/git2/data/commit.py
similarity index 94%
rename from infra/services/gnumbd/support/data.py
rename to infra/libs/git2/data/commit.py
index 4a3a6c3e23f5d0d28a46861805559407d3b3b25b..0095bda82aafebda8c50a80b8c36171606860881 100644
--- a/infra/services/gnumbd/support/data.py
+++ b/infra/libs/git2/data/commit.py
@@ -8,10 +8,14 @@ import re
 
 from cStringIO import StringIO
 
-from infra.services.gnumbd.support.util import cached_property, freeze
+from infra.libs.decorators import cached_property
+from infra.libs.types import freeze
+
+from infra.libs.git2.data.data import Alterable
 
 LOGGER = logging.getLogger(__name__)
 
+
 ################################################################################
 # Exceptions
 ################################################################################
@@ -30,27 +34,6 @@ class UnexpectedHeader(Exception):
 
 
 ################################################################################
-# Base Class
-################################################################################
-
-class Alterable(object):
-  def to_dict(self):  # pragma: no cover
-    """The shallow dictionary representation of this object (i.e. the dictionary
-    may contain Alterable instances as values)."""
-    raise NotImplementedError()
-
-  def alter(self, **kwargs):  # pragma: no cover
-    """Returns a copy of self, except with the fields listed in kwargs replaced
-    with new values."""
-    raise NotImplementedError()
-
-  @classmethod
-  def from_raw(cls, data):  # pragma: no cover
-    """Construct an instance of this class from a string."""
-    raise NotImplementedError()
-
-
-################################################################################
 # Implementation
 ################################################################################