feat(ai_news): articles_source module (substring ticker matching)

stock-lab/tests/test_ai_news_articles_source.py

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+import datetime as dt
+import sqlite3
+import pytest
+
+from app.screener.ai_news import articles_source
+from app.screener.schema import ensure_screener_schema
+
+
+@pytest.fixture
+def conn():
+    c = sqlite3.connect(":memory:")
+    c.row_factory = sqlite3.Row
+    ensure_screener_schema(c)
+    yield c
+    c.close()
+
+
+def _seed_master(conn, ticker, name):
+    conn.execute(
+        "INSERT INTO krx_master (ticker, name, market, market_cap, updated_at) "
+        "VALUES (?, ?, 'KOSPI', 1000000000, datetime('now'))",
+        (ticker, name),
+    )
+
+
+def _seed_article(conn, title, summary="", crawled_at="2026-05-14T07:30:00"):
+    import hashlib
+    h = hashlib.md5(f"{title}|x".encode()).hexdigest()
+    conn.execute(
+        "INSERT INTO articles (hash, title, summary, link, press, pub_date, crawled_at) "
+        "VALUES (?, ?, ?, '', '', '2026-05-14', ?)",
+        (h, title, summary, crawled_at),
+    )
+
+
+ASOF = dt.date(2026, 5, 14)
+
+
+def test_single_ticker_match_in_title(conn):
+    _seed_master(conn, "005930", "삼성전자")
+    _seed_article(conn, "삼성전자, HBM 양산 가시화")
+    conn.commit()
+    out, stats = articles_source.gather_articles_for_tickers(
+        conn, ["005930"], ASOF, window_days=1, max_per_ticker=5,
+    )
+    assert len(out["005930"]) == 1
+    assert out["005930"][0]["title"] == "삼성전자, HBM 양산 가시화"
+    assert stats["matched_pairs"] == 1
+    assert stats["hit_tickers"] == 1
+
+
+def test_single_ticker_match_in_summary(conn):
+    _seed_master(conn, "005930", "삼성전자")
+    _seed_article(conn, "메모리 시장 회복세", summary="삼성전자가 1분기 어닝 서프라이즈")
+    conn.commit()
+    out, _ = articles_source.gather_articles_for_tickers(
+        conn, ["005930"], ASOF, window_days=1, max_per_ticker=5,
+    )
+    assert len(out["005930"]) == 1
+
+
+def test_multi_ticker_match(conn):
+    _seed_master(conn, "005930", "삼성전자")
+    _seed_master(conn, "000660", "SK하이닉스")
+    _seed_article(conn, "삼성전자와 SK하이닉스, 메모리 양산 경쟁")
+    conn.commit()
+    out, stats = articles_source.gather_articles_for_tickers(
+        conn, ["005930", "000660"], ASOF, window_days=1, max_per_ticker=5,
+    )
+    assert len(out["005930"]) == 1
+    assert len(out["000660"]) == 1
+    assert stats["matched_pairs"] == 2
+    assert stats["hit_tickers"] == 2
+
+
+def test_no_match_returns_empty_list(conn):
+    _seed_master(conn, "005930", "삼성전자")
+    _seed_article(conn, "엔비디아 실적 발표", summary="AI 칩 수요 견조")
+    conn.commit()
+    out, stats = articles_source.gather_articles_for_tickers(
+        conn, ["005930"], ASOF, window_days=1, max_per_ticker=5,
+    )
+    assert out["005930"] == []
+    assert stats["matched_pairs"] == 0
+    assert stats["hit_tickers"] == 0
+
+
+def test_max_per_ticker_caps_results(conn):
+    _seed_master(conn, "005930", "삼성전자")
+    for i in range(6):
+        _seed_article(conn, f"삼성전자 뉴스 #{i}", crawled_at=f"2026-05-14T0{i}:00:00")
+    conn.commit()
+    out, _ = articles_source.gather_articles_for_tickers(
+        conn, ["005930"], ASOF, window_days=1, max_per_ticker=5,
+    )
+    assert len(out["005930"]) == 5
+
+
+def test_window_days_filters_old_articles(conn):
+    _seed_master(conn, "005930", "삼성전자")
+    _seed_article(conn, "삼성전자 최신 뉴스", crawled_at="2026-05-14T07:00:00")
+    _seed_article(conn, "삼성전자 오래된 뉴스", crawled_at="2026-05-01T07:00:00")
+    conn.commit()
+    out, _ = articles_source.gather_articles_for_tickers(
+        conn, ["005930"], ASOF, window_days=1, max_per_ticker=5,
+    )
+    assert len(out["005930"]) == 1
+    assert "최신" in out["005930"][0]["title"]