test: cover KIS pagination consumer seams

tests/conftest.py

@@ -14,6 +14,8 @@ import os
 
 import pytest
 
+from trex_core.adapters.broker.kis import KISBroker
+
 _PG_TABLES = (
     "broker_account_snapshot",
     "killswitch_exclusion",
@@ -26,6 +28,53 @@ _PG_TABLES = (
 )
 
 
+@pytest.fixture
+def kis_balance_broker_factory(monkeypatch):
+    """Build a real KISBroker backed by deterministic synthetic balance pages."""
+
+    def factory(responses):
+        broker = KISBroker(
+            "12345678-01",
+            app_key="test-app-key",
+            app_secret="test-app-secret",
+            base_url="https://openapivts.kis.test",
+        )
+        monkeypatch.setattr(broker, "_headers", lambda _tr: {})
+        pending = list(responses)
+        calls = []
+
+        class Response:
+            def __init__(self, page):
+                self._page = page
+                self.headers = {"tr_cont": page.get("tr_cont", "E")}
+
+            def raise_for_status(self):
+                return None
+
+            def json(self):
+                return {
+                    "rt_cd": self._page.get("rt_cd", "0"),
+                    "output1": self._page.get("rows", []),
+                    "ctx_area_fk100": self._page.get("fk", ""),
+                    "ctx_area_nk100": self._page.get("nk", ""),
+                }
+
+        def fake_get(*_args, **kwargs):
+            calls.append({
+                "headers": dict(kwargs["headers"]),
+                "params": dict(kwargs["params"]),
+            })
+            response = pending.pop(0)
+            if isinstance(response, BaseException):
+                raise response
+            return Response(response)
+
+        monkeypatch.setattr("trex_core.adapters.broker.kis.httpx.get", fake_get)
+        return broker, calls
+
+    return factory
+
+
 @pytest.fixture
 def pg_dsn() -> str:
     dsn = os.environ.get("TREX_POSTGRESQL_TEST_DSN")