.

lib/tests/test_zodb.py

@@ -85,3 +85,13 @@ def test_deactivate_btree():
         for obj in [B] + leafv:
             assert obj._p_state == GHOST
             assert obj not in cached
+
+
+def test_zconn_at():
+    # TODO commit -> know head -> open conn1,
+    #      open conn2, commit there; wait or sync, make sure zconn_at(conn1) is as expected
+
+    # TODO zconn_at for historic connection
+
+
+    pass

z.txt

 ZODB5
 -----
 
-zconn.db._storage always provide IMVCCStorage - either raw storage provides it,
+zconn.db._storage always provides IMVCCStorage - either raw storage provides it,
 or DB wraps raw storage with MVCCAdapter.
 
 MVCCAdapter in turn uses either MVCCAdapterInstance (current) or
@@ -27,7 +27,11 @@ RelStorage is IMVCCStorage - TODO: how to extract at.
 ZODB4
 -----
 
-TODO /_txn_time in Connection.py
+Connection:
+    .before     !None for historic connections
+
+    ._txn_time  - if !None - set to tid of _next_ transaction
+                  XXX set to None initially - what to do?