diff --git a/realestate-lab/app/db.py b/realestate-lab/app/db.py
index 45b4dc6..255ebe3 100644
--- a/realestate-lab/app/db.py
+++ b/realestate-lab/app/db.py
@@ -1,5 +1,6 @@
 # realestate-lab/app/db.py
 import json
+import os
 import sqlite3
 import logging
 from typing import Dict, Any, List, Optional
@@ -7,7 +8,7 @@ from datetime import date
 
 logger = logging.getLogger("realestate-lab")
 
-DB_PATH = "/app/data/realestate.db"
+DB_PATH = os.getenv("REALESTATE_DB_PATH", "/app/data/realestate.db")
 
 
 def _conn():
diff --git a/realestate-lab/tests/__init__.py b/realestate-lab/tests/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/realestate-lab/tests/conftest.py b/realestate-lab/tests/conftest.py
new file mode 100644
index 0000000..023f392
--- /dev/null
+++ b/realestate-lab/tests/conftest.py
@@ -0,0 +1,26 @@
+import os
+import sys
+import tempfile
+import pytest
+
+# 테스트 임시 DB 경로를 import 전에 주입
+_TMP_DB = tempfile.mktemp(suffix=".db")
+os.environ["REALESTATE_DB_PATH"] = _TMP_DB
+
+# app 패키지 import 가능하게 PYTHONPATH 보정
+sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
+
+
+@pytest.fixture(autouse=True)
+def _clean_db():
+    """각 테스트마다 DB 초기화."""
+    if os.path.exists(_TMP_DB):
+        os.remove(_TMP_DB)
+    from app.db import init_db
+    init_db()
+    yield
+    try:
+        if os.path.exists(_TMP_DB):
+            os.remove(_TMP_DB)
+    except OSError:
+        pass  # Windows: SQLite 파일 잠금 해제 전 삭제 실패 무시
diff --git a/realestate-lab/tests/test_db_basic.py b/realestate-lab/tests/test_db_basic.py
new file mode 100644
index 0000000..9268465
--- /dev/null
+++ b/realestate-lab/tests/test_db_basic.py
@@ -0,0 +1,11 @@
+def test_init_db_creates_tables():
+    from app.db import _conn
+    with _conn() as conn:
+        tables = {row[0] for row in conn.execute(
+            "SELECT name FROM sqlite_master WHERE type='table'"
+        )}
+    assert "announcements" in tables
+    assert "announcement_models" in tables
+    assert "user_profile" in tables
+    assert "match_results" in tables
+    assert "collect_log" in tables