improve composite on-compile event

diff --git a/test/orm/test_composites.py b/test/orm/test_composites.py
index f13720e..9b34333 100644
--- a/test/orm/test_composites.py
+++ b/test/orm/test_composites.py
@@ -78,6 +78,11 @@ class PointTest(fixtures.MappedTest):
         sess.commit()
         return sess

+    def test_early_configure(self):
+        Edge = self.classes.Edge
+        sess = Session()
+        sess.query(Edge.start)
+
     def test_round_trip(self):
         Graph, Point = self.classes.Graph, self.classes.Point

fails because _init_props() hasn't been called.

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