fix: correct TR_ID, path, and params for fetch_market_rankings (#155)

Three bugs found by comparing against KIS official GitHub examples:

1. FID_COND_SCR_DIV_CODE: "20001" → "20171" (volume-rank screen code)
2. FID_TRGT_EXLS_CLS_CODE: "000000" (6-digit) → "0000000000" (10-digit)
3. fluctuation ranking:
   - TR_ID: "FHPST01710100" (invalid) → "FHPST01700000"
   - path: /quotations/volume-rank → /ranking/fluctuation
   - params: volume-rank params → lowercase fluctuation-specific params
     (fid_rank_sort_cls_code, fid_input_cnt_1, fid_prc_cls_code,
      fid_rsfl_rate1, fid_rsfl_rate2, etc.)

Note: VTS (paper trading) does not return data from ranking APIs regardless
of parameter correctness — this is a KIS policy restriction, not a code bug.
These fixes ensure correct behavior when switching to a live account.

Tests: TestFetchMarketRankings (3 tests) added to test_broker.py

Closes #155

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/broker/kis_api.py

@@ -304,26 +304,46 @@ class KISBroker:
         await self._rate_limiter.acquire()
         session = self._get_session()
 
-        # TR_ID for volume ranking
+        if ranking_type == "volume":
-        tr_id = "FHPST01710000" if ranking_type == "volume" else "FHPST01710100"
+            # 거래량순위: FHPST01710000 / /quotations/volume-rank
+            tr_id = "FHPST01710000"
+            url = f"{self._base_url}/uapi/domestic-stock/v1/quotations/volume-rank"
+            params: dict[str, str] = {
+                "FID_COND_MRKT_DIV_CODE": "J",
+                "FID_COND_SCR_DIV_CODE": "20171",
+                "FID_INPUT_ISCD": "0000",
+                "FID_DIV_CLS_CODE": "0",
+                "FID_BLNG_CLS_CODE": "0",
+                "FID_TRGT_CLS_CODE": "111111111",
+                "FID_TRGT_EXLS_CLS_CODE": "0000000000",
+                "FID_INPUT_PRICE_1": "0",
+                "FID_INPUT_PRICE_2": "0",
+                "FID_VOL_CNT": "0",
+                "FID_INPUT_DATE_1": "",
+            }
+        else:
+            # 등락률순위: FHPST01700000 / /ranking/fluctuation (소문자 파라미터)
+            tr_id = "FHPST01700000"
+            url = f"{self._base_url}/uapi/domestic-stock/v1/ranking/fluctuation"
+            params = {
+                "fid_cond_mrkt_div_code": "J",
+                "fid_cond_scr_div_code": "20170",
+                "fid_input_iscd": "0000",
+                "fid_rank_sort_cls_code": "0000",
+                "fid_input_cnt_1": str(limit),
+                "fid_prc_cls_code": "0",
+                "fid_input_price_1": "0",
+                "fid_input_price_2": "0",
+                "fid_vol_cnt": "0",
+                "fid_trgt_cls_code": "0",
+                "fid_trgt_exls_cls_code": "0",
+                "fid_div_cls_code": "0",
+                "fid_rsfl_rate1": "0",
+                "fid_rsfl_rate2": "0",
+            }
+
         headers = await self._auth_headers(tr_id)
 
-        params = {
-            "FID_COND_MRKT_DIV_CODE": "J",  # Stock/ETF/ETN
-            "FID_COND_SCR_DIV_CODE": "20001",  # Volume surge
-            "FID_INPUT_ISCD": "0000",  # All stocks
-            "FID_DIV_CLS_CODE": "0",  # All types
-            "FID_BLNG_CLS_CODE": "0",
-            "FID_TRGT_CLS_CODE": "111111111",
-            "FID_TRGT_EXLS_CLS_CODE": "000000",
-            "FID_INPUT_PRICE_1": "0",
-            "FID_INPUT_PRICE_2": "0",
-            "FID_VOL_CNT": "0",
-            "FID_INPUT_DATE_1": "",
-        }
-
-        url = f"{self._base_url}/uapi/domestic-stock/v1/quotations/volume-rank"
-
         try:
             async with session.get(url, headers=headers, params=params) as resp:
                 if resp.status != 200:

tests/test_broker.py

@@ -3,7 +3,7 @@
 from __future__ import annotations
 
 import asyncio
-from unittest.mock import AsyncMock, patch
+from unittest.mock import AsyncMock, MagicMock, patch
 
 import pytest
 
@@ -296,3 +296,82 @@ class TestHashKey:
                 mock_acquire.assert_called_once()
 
         await broker.close()
+
+
+# ---------------------------------------------------------------------------
+# fetch_market_rankings — TR_ID, path, params (issue #155)
+# ---------------------------------------------------------------------------
+
+
+def _make_ranking_mock(items: list[dict]) -> AsyncMock:
+    """Build a mock HTTP response returning ranking items."""
+    mock_resp = AsyncMock()
+    mock_resp.status = 200
+    mock_resp.json = AsyncMock(return_value={"output": items})
+    mock_resp.__aenter__ = AsyncMock(return_value=mock_resp)
+    mock_resp.__aexit__ = AsyncMock(return_value=False)
+    return mock_resp
+
+
+class TestFetchMarketRankings:
+    """Verify correct TR_ID, API path, and params per ranking_type (issue #155)."""
+
+    @pytest.fixture
+    def broker(self, settings) -> KISBroker:
+        b = KISBroker(settings)
+        b._access_token = "tok"
+        b._token_expires_at = float("inf")
+        b._rate_limiter.acquire = AsyncMock()
+        return b
+
+    @pytest.mark.asyncio
+    async def test_volume_uses_correct_tr_id_and_path(self, broker: KISBroker) -> None:
+        mock_resp = _make_ranking_mock([])
+        with patch("aiohttp.ClientSession.get", return_value=mock_resp) as mock_get:
+            await broker.fetch_market_rankings(ranking_type="volume")
+
+        call_kwargs = mock_get.call_args
+        url = call_kwargs[0][0] if call_kwargs[0] else call_kwargs[1].get("url", "")
+        headers = call_kwargs[1].get("headers", {})
+        params = call_kwargs[1].get("params", {})
+
+        assert "volume-rank" in url
+        assert headers.get("tr_id") == "FHPST01710000"
+        assert params.get("FID_COND_SCR_DIV_CODE") == "20171"
+        assert params.get("FID_TRGT_EXLS_CLS_CODE") == "0000000000"
+
+    @pytest.mark.asyncio
+    async def test_fluctuation_uses_correct_tr_id_and_path(self, broker: KISBroker) -> None:
+        mock_resp = _make_ranking_mock([])
+        with patch("aiohttp.ClientSession.get", return_value=mock_resp) as mock_get:
+            await broker.fetch_market_rankings(ranking_type="fluctuation")
+
+        call_kwargs = mock_get.call_args
+        url = call_kwargs[0][0] if call_kwargs[0] else call_kwargs[1].get("url", "")
+        headers = call_kwargs[1].get("headers", {})
+        params = call_kwargs[1].get("params", {})
+
+        assert "ranking/fluctuation" in url
+        assert headers.get("tr_id") == "FHPST01700000"
+        assert params.get("fid_cond_scr_div_code") == "20170"
+
+    @pytest.mark.asyncio
+    async def test_volume_returns_parsed_rows(self, broker: KISBroker) -> None:
+        items = [
+            {
+                "mksc_shrn_iscd": "005930",
+                "hts_kor_isnm": "삼성전자",
+                "stck_prpr": "75000",
+                "acml_vol": "10000000",
+                "prdy_ctrt": "2.5",
+                "vol_inrt": "150",
+            }
+        ]
+        mock_resp = _make_ranking_mock(items)
+        with patch("aiohttp.ClientSession.get", return_value=mock_resp):
+            result = await broker.fetch_market_rankings(ranking_type="volume")
+
+        assert len(result) == 1
+        assert result[0]["stock_code"] == "005930"
+        assert result[0]["price"] == 75000.0
+        assert result[0]["change_rate"] == 2.5