fix(audit): fermer les frontieres restantes

tests/test_query_shape.py

@@ -233,6 +233,42 @@ class TestPendingEvaluations:
         assert self._pending(client) == 1
 
 
+class TestRegisteredPlayersForMatchForm:
+    """The match forms used to issue one or two user lookups per registration."""
+
+    def test_the_result_is_unique_ordered_and_constant_cost(self, app, make_user, count_queries):
+        admin_id = make_user('admin')
+        player_ids = [make_user('player', username=name) for name in ('zulu', 'alpha', 'mike')]
+
+        with app.app_context():
+            tryout = Tryout(
+                title='Match form',
+                game='Valorant',
+                date=date(2030, 3, 1),
+                created_by=admin_id,
+            )
+            db.session.add(tryout)
+            db.session.flush()
+            for player_id in player_ids:
+                db.session.add(TryoutRegistration(tryout_id=tryout.id, player_id=player_id))
+            # DB-006 is pending, so prove the UI remains unique even when the
+            # current database already contains a duplicate registration.
+            db.session.add(TryoutRegistration(tryout_id=tryout.id, player_id=player_ids[0]))
+            db.session.commit()
+            tryout_id = tryout.id
+
+            from app.routes.matches import registered_players
+
+            counter = count_queries()
+            try:
+                players = registered_players(tryout_id)
+            finally:
+                counter.stop()
+
+        assert [player.username for player in players] == ['alpha', 'mike', 'zulu']
+        assert counter.total == 1
+
+
 class TestViewTryout:
     """PERF-001 — the most-visited page in the application ran one query
     per registration, one per player evaluated, one per team, and one per