message: TF Framework ops_test missing test case add
  1-has_default_graph api test case
  2-get_all_collection_keys api test case
diff: @@ -1587,6 +1587,8 @@ class CollectionTest(test_util.TensorFlowTestCase):
  self.assertSequenceEqual(g.collections, ["key"])
  g.add_to_collection("other", "foo")
  self.assertSequenceEqual(sorted(g.collections), ["key", "other"])
  + self.assertSequenceEqual(sorted(g.get_all_collection_keys()),
  + ["key", "other"])
  def test_add_to_collection(self):
  g = ops.Graph()
  @@ -2408,17 +2410,22 @@ class GraphTest(test_util.TensorFlowTestCase):
  def testDefaultGraph(self):
  orig = ops.get_default_graph()
  + self.assertFalse(ops.has_default_graph())
  self._AssertDefault(orig)
  g0 = ops.Graph()
  + self.assertFalse(ops.has_default_graph())
  self._AssertDefault(orig)
  context_manager_0 = g0.as_default()
  + self.assertFalse(ops.has_default_graph())
  self._AssertDefault(orig)
  with context_manager_0 as g0:
  self._AssertDefault(g0)
  with ops.Graph().as_default() as g1:
  + self.assertTrue(ops.has_default_graph())
  self._AssertDefault(g1)
  self._AssertDefault(g0)
  self._AssertDefault(orig)
  + self.assertFalse(ops.has_default_graph())
  def testPreventFeeding(self):
  g = ops.Graph()
  