feat(insta-lab): keyword_extractor with frequency + Claude refinement

insta-lab/tests/test_keyword_extractor.py

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+import os
+import tempfile
+from unittest.mock import patch, MagicMock
+
+import pytest
+
+from app import db as db_module
+from app import keyword_extractor
+
+
+@pytest.fixture
+def tmp_db(monkeypatch):
+    fd, path = tempfile.mkstemp(suffix=".db")
+    os.close(fd)
+    monkeypatch.setattr(db_module, "DB_PATH", path)
+    db_module.init_db()
+    yield path
+    # Windows-safe cleanup: close handles + remove sidecars
+    import gc
+    gc.collect()
+    for ext in ("", "-wal", "-shm"):
+        try:
+            os.remove(path + ext)
+        except OSError:
+            pass
+
+
+def test_count_nouns_extracts_korean_nouns():
+    text = "기준금리 인상으로 환율 급등. 기준금리 추가 인상 가능성"
+    counts = keyword_extractor._count_nouns(text)
+    assert counts["기준금리"] == 2
+    assert counts["환율"] == 1
+
+
+def test_top_candidates_filters_stopwords():
+    counts = {"기준금리": 5, "있다": 7, "환율": 3, "그리고": 4}
+    top = keyword_extractor._top_candidates(counts, n=10)
+    keywords = [k for k, _ in top]
+    assert "있다" not in keywords
+    assert "그리고" not in keywords
+    assert "기준금리" in keywords
+
+
+def test_extract_for_category_persists(tmp_db):
+    # seed articles
+    for i in range(3):
+        db_module.add_news_article({
+            "category": "economy",
+            "title": f"기준금리 인상 {i}",
+            "link": f"https://example.com/{i}",
+            "summary": "환율도 영향",
+        })
+
+    # mock LLM refinement
+    fake_refined = [
+        {"keyword": "기준금리", "score": 0.92, "reason": "핵심 금융 이슈"},
+        {"keyword": "환율", "score": 0.71, "reason": "시장 영향"},
+    ]
+    with patch.object(keyword_extractor, "_refine_with_llm", return_value=fake_refined):
+        kws = keyword_extractor.extract_for_category("economy", limit=2)
+
+    assert len(kws) == 2
+    assert kws[0]["keyword"] == "기준금리"
+    persisted = db_module.list_trending_keywords(category="economy")
+    assert {p["keyword"] for p in persisted} == {"기준금리", "환율"}