Cleaned up check_checkCurrentSerialInTransaction

- Use assertEqual rather than assertTrue for better error messages.

- Fixed a typo that caused an assertion to be missed.

src/ZODB/tests/BasicStorage.py

@@ -233,8 +233,8 @@ def check_checkCurrentSerialInTransaction(self):
             self._storage.checkCurrentSerialInTransaction(oid, tid, t)
             self._storage.tpc_vote(t)
         except POSException.ReadConflictError as v:
-            self.assertTrue(v.oid) == oid
-            self.assertTrue(v.serials == (tid2, tid))
+            self.assertEqual(v.oid, oid)
+            self.assertEqual(v.serials, (tid2, tid))
         else:
             if 0: self.assertTrue(False, "No conflict error")