chore: PR #221 충돌 해결 — WAL 테스트(#210)와 mode 컬럼 테스트(#212) 병합

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

tests/test_db.py

@@ -1,5 +1,8 @@
 """Tests for database helper functions."""
 
+import tempfile
+import os
+
 from src.db import get_open_position, init_db, log_trade
 
 
@@ -60,6 +63,40 @@ def test_get_open_position_returns_none_when_no_trades() -> None:
     assert get_open_position(conn, "AAPL", "US_NASDAQ") is None
 
 
+# ---------------------------------------------------------------------------
+# WAL mode tests (issue #210)
+# ---------------------------------------------------------------------------
+
+
+def test_wal_mode_applied_to_file_db() -> None:
+    """File-based DB must use WAL journal mode for dashboard concurrent reads."""
+    with tempfile.NamedTemporaryFile(suffix=".db", delete=False) as f:
+        db_path = f.name
+    try:
+        conn = init_db(db_path)
+        cursor = conn.execute("PRAGMA journal_mode")
+        mode = cursor.fetchone()[0]
+        assert mode == "wal", f"Expected WAL mode, got {mode}"
+        conn.close()
+    finally:
+        os.unlink(db_path)
+        # Clean up WAL auxiliary files if they exist
+        for ext in ("-wal", "-shm"):
+            path = db_path + ext
+            if os.path.exists(path):
+                os.unlink(path)
+
+
+def test_wal_mode_not_applied_to_memory_db() -> None:
+    """:memory: DB must not apply WAL (SQLite does not support WAL for in-memory)."""
+    conn = init_db(":memory:")
+    cursor = conn.execute("PRAGMA journal_mode")
+    mode = cursor.fetchone()[0]
+    # In-memory DBs default to 'memory' journal mode
+    assert mode != "wal", "WAL should not be set on in-memory database"
+    conn.close()
+
+
 # ---------------------------------------------------------------------------
 # mode column tests (issue #212)
 # ---------------------------------------------------------------------------
@@ -122,14 +159,12 @@ def test_mode_column_exists_in_schema() -> None:
 
 def test_mode_migration_adds_column_to_existing_db() -> None:
     """init_db must add mode column to existing DBs that lack it (migration)."""
-    import tempfile
-    import os
+    import sqlite3
 
     with tempfile.NamedTemporaryFile(suffix=".db", delete=False) as f:
         db_path = f.name
     try:
         # Create DB without mode column (simulate old schema)
-        import sqlite3
         old_conn = sqlite3.connect(db_path)
         old_conn.execute(
             """CREATE TABLE trades (