follow up to bug 1007 commit.
Use self.assertTrue in test cases rather than the assert statement.
diff --git a/Lib/test/test_dumbdbm.py b/Lib/test/test_dumbdbm.py
index d5a74fb..f327a5a 100644
--- a/Lib/test/test_dumbdbm.py
+++ b/Lib/test/test_dumbdbm.py
@@ -92,7 +92,7 @@
     def test_write_contains(self):
         f = dumbdbm.open(_fname)
         f[b'1'] = b'hello'
-        assert b'1' in f
+        self.assertTrue(b'1' in f)
         f.close()
 
     def test_write_write_read(self):