feat(signal_v2-phase3a): kis_client REST + 4 integration tests

KISClient: 분봉 (FHKST03010200) + 호가 (FHKST01010200) async REST.
V1 토큰 파일 (signal_v1/data/kis_token.json) read-only 공유, mtime
캐시. 초당 2회 throttle. exponential retry (max 3, 1s/2s/4s).

4 tests pass.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

signal_v2/tests/test_kis_client.py

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+"""Tests for KISClient (REST)."""
+import json
+from pathlib import Path
+
+import httpx
+import pytest
+import respx
+
+from signal_v2.kis_client import KISClient
+
+
+@pytest.fixture
+def fake_v1_token(tmp_path):
+    """V1 토큰 파일 fixture."""
+    token_file = tmp_path / "kis_token.json"
+    token_file.write_text(json.dumps({
+        "access_token": "test-kis-token-abc123",
+        "token_expired": "2099-12-31 23:59:59",
+    }))
+    return token_file
+
+
+@pytest.fixture
+def kis_client_factory(fake_v1_token):
+    def _make():
+        return KISClient(
+            app_key="test-app-key",
+            app_secret="test-app-secret",
+            account="50000000-01",
+            is_virtual=True,
+            v1_token_path=fake_v1_token,
+        )
+    return _make
+
+
+@respx.mock
+async def test_get_minute_ohlcv_normal_returns_30_bars(kis_client_factory):
+    """정상 200 → 30개 분봉 list 반환."""
+    sample_output2 = [
+        {
+            "stck_bsop_date": "20260518",
+            "stck_cntg_hour": f"09{m:02d}00",
+            "stck_oprc": "78000", "stck_hgpr": "78500",
+            "stck_lwpr": "77800", "stck_prpr": "78300",
+            "cntg_vol": "12345",
+        }
+        for m in range(30)  # 9:00-9:29 = 30 bars
+    ]
+    respx.get(
+        "https://openapivts.koreainvestment.com:29443/uapi/domestic-stock/v1/quotations/inquire-time-itemchartprice"
+    ).mock(
+        return_value=httpx.Response(200, json={"output2": sample_output2})
+    )
+
+    client = kis_client_factory()
+    try:
+        bars = await client.get_minute_ohlcv("005930")
+        assert len(bars) == 30
+        assert bars[0]["close"] == 78300
+        assert "datetime" in bars[0]
+    finally:
+        await client.close()
+
+
+@respx.mock
+async def test_get_minute_ohlcv_429_retry_then_success(kis_client_factory, monkeypatch):
+    """429 → exponential backoff → 200."""
+    sleep_calls = []
+    async def fake_sleep(s): sleep_calls.append(s)
+    monkeypatch.setattr("asyncio.sleep", fake_sleep)
+
+    respx.get(
+        "https://openapivts.koreainvestment.com:29443/uapi/domestic-stock/v1/quotations/inquire-time-itemchartprice"
+    ).mock(side_effect=[
+        httpx.Response(429, text="rate limit"),
+        httpx.Response(200, json={"output2": []}),
+    ])
+    client = kis_client_factory()
+    try:
+        result = await client.get_minute_ohlcv("005930")
+        assert result == []
+        assert 1 in sleep_calls
+    finally:
+        await client.close()
+
+
+@respx.mock
+async def test_get_minute_ohlcv_uses_v1_token(kis_client_factory, fake_v1_token):
+    """KIS 호출 헤더에 V1 토큰 파일의 access_token 사용."""
+    route = respx.get(
+        "https://openapivts.koreainvestment.com:29443/uapi/domestic-stock/v1/quotations/inquire-time-itemchartprice"
+    ).mock(return_value=httpx.Response(200, json={"output2": []}))
+
+    client = kis_client_factory()
+    try:
+        await client.get_minute_ohlcv("005930")
+        assert route.called
+        req = route.calls.last.request
+        # check authorization header contains the V1 token
+        auth = req.headers.get("authorization", "")
+        assert "test-kis-token-abc123" in auth
+    finally:
+        await client.close()
+
+
+@respx.mock
+async def test_get_asking_price_computes_bid_ratio(kis_client_factory):
+    """호가 응답 → bid_total/(bid+ask) bid_ratio 계산."""
+    respx.get(
+        "https://openapivts.koreainvestment.com:29443/uapi/domestic-stock/v1/quotations/inquire-asking-price-exp-ccn"
+    ).mock(return_value=httpx.Response(200, json={
+        "output1": {
+            "total_bidp_rsqn": "600",
+            "total_askp_rsqn": "400",
+            "stck_prpr": "78500",
+        }
+    }))
+
+    client = kis_client_factory()
+    try:
+        data = await client.get_asking_price("005930")
+        assert data["bid_total"] == 600
+        assert data["ask_total"] == 400
+        assert abs(data["bid_ratio"] - 0.6) < 1e-9
+        assert data["current_price"] == 78500
+        assert "as_of" in data
+    finally:
+        await client.close()