Ensure descendants of mixins don't become cacheable

HasPrefix / HasSuffixes / SupportsCloneAnnotations exported
a _traverse_internals attribute that does not represent a
complete traversal, meaning non-traversible subclasses would
seem traversible.  rename these attributes so that this
does not occur.  DML is currently not traversible (will be soon).

Change-Id: I2605e61c8c3d49965335e66e09f4aeedc5e73bd3

1 files changed, 5 insertions, 1 deletions

diff --git a/test/sql/test_compare.py b/test/sql/test_compare.py
index 2d0e39331..7333fb306 100644
--- a/test/sql/test_compare.py
+++ b/test/sql/test_compare.py
@@ -19,6 +19,7 @@ from sqlalchemy import select
 from sqlalchemy import String
 from sqlalchemy import Table
 from sqlalchemy import table
+from sqlalchemy import testing
 from sqlalchemy import text
 from sqlalchemy import tuple_
 from sqlalchemy import union
@@ -62,7 +63,6 @@ from sqlalchemy.testing import ne_
 from sqlalchemy.testing.util import random_choices
 from sqlalchemy.util import class_hierarchy
 
-
 meta = MetaData()
 meta2 = MetaData()
 
@@ -543,6 +543,10 @@ class CacheKeyFixture(object):
 
 
 class CacheKeyTest(CacheKeyFixture, CoreFixtures, fixtures.TestBase):
+    @testing.combinations(table_a.update(), table_a.insert(), table_a.delete())
+    def test_dml_not_cached_yet(self, dml_stmt):
+        eq_(dml_stmt._generate_cache_key(), None)
+
     def test_cache_key(self):
         for fixtures_, compare_values in [
             (self.fixtures, True),