From d312bdf9689d30690571d39b3dd5cc9409567654 Mon Sep 17 00:00:00 2001
From: 1445043649 <>
Date: Mon, 11 May 2026 09:12:28 +0800
Subject: [PATCH] test(config): pin default postgres backend + sqlite
 regression
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新建 backend/tests/test_default_database_backend.py 两个测试：

  - test_explicit_sqlite_backend_still_works (T2.3)
    显式 database.backend=sqlite 仍生效；防 PR2 改默认后 SQLite 用户
    悄无声息 regression
  - test_config_example_default_backend_is_postgres (T2.4)
    直接读 on-disk config.example.yaml，断言 database.backend == 'postgres'
    且 postgres_url == '\$DATABASE_URL'（不允许硬编码凭据）

Stage 0 PR2 T2.3 + T2.4.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
---
 .../tests/test_default_database_backend.py    | 90 +++++++++++++++++++
 1 file changed, 90 insertions(+)
 create mode 100644 backend/tests/test_default_database_backend.py

diff --git a/backend/tests/test_default_database_backend.py b/backend/tests/test_default_database_backend.py
new file mode 100644
index 00000000..1421bca0
--- /dev/null
+++ b/backend/tests/test_default_database_backend.py
@@ -0,0 +1,90 @@
+"""Stage 0 PR2 · default backend regression + sqlite-still-works.
+
+Two facts pinned here:
+  T2.3 — explicit ``database.backend: sqlite`` still produces a working
+         config (backwards-compat for users who deliberately stay on SQLite).
+  T2.4 — ``config.example.yaml`` default ``database.backend`` is ``postgres``
+         (Stage 0 PR2 flipped this from sqlite).
+"""
+
+from __future__ import annotations
+
+import json
+from pathlib import Path
+
+import pytest
+import yaml
+
+from deerflow.config.app_config import AppConfig
+
+REPO_ROOT = Path(__file__).resolve().parents[2]
+
+
+def _write_extensions_config(path: Path) -> None:
+    path.write_text(json.dumps({"mcpServers": {}, "skills": {}}), encoding="utf-8")
+
+
+# ---------------------------------------------------------------------------
+# T2.3 · sqlite backend regression
+# ---------------------------------------------------------------------------
+
+
+def test_explicit_sqlite_backend_still_works(tmp_path, monkeypatch) -> None:
+    """A config with explicit ``database.backend: sqlite`` must still parse.
+
+    Pin: PR2 made postgres the example default. This test guarantees that
+    users who copy the SQLite fallback block to their config.yaml do not
+    silently regress.
+    """
+    config_path = tmp_path / "config.yaml"
+    extensions_path = tmp_path / "extensions_config.json"
+    _write_extensions_config(extensions_path)
+    config_path.write_text(
+        yaml.safe_dump(
+            {
+                "models": [
+                    {
+                        "name": "test",
+                        "use": "langchain_openai:ChatOpenAI",
+                        "model": "gpt-4",
+                    }
+                ],
+                "database": {
+                    "backend": "sqlite",
+                    "sqlite_dir": "/custom/sqlite/path",
+                },
+                "sandbox": {"use": "deerflow.sandbox.local:LocalSandboxProvider"},
+            }
+        ),
+        encoding="utf-8",
+    )
+    monkeypatch.setenv("DEER_FLOW_EXTENSIONS_CONFIG_PATH", str(extensions_path))
+
+    config = AppConfig.from_file(str(config_path))
+
+    assert config.database.backend == "sqlite"
+    assert config.database.sqlite_dir == "/custom/sqlite/path"
+
+
+# ---------------------------------------------------------------------------
+# T2.4 · default config.example.yaml uses postgres
+# ---------------------------------------------------------------------------
+
+
+def test_config_example_default_backend_is_postgres(monkeypatch) -> None:
+    """Pin Stage 0 PR2's commitment: the example config defaults to Postgres.
+
+    Loaded directly from the on-disk ``config.example.yaml`` so any future
+    accidental flip back to sqlite would fail this test.
+    """
+    example_path = REPO_ROOT / "config.example.yaml"
+    if not example_path.exists():
+        pytest.skip(f"config.example.yaml not found at {example_path}")
+
+    raw = yaml.safe_load(example_path.read_text(encoding="utf-8")) or {}
+    db = raw.get("database") or {}
+
+    assert db.get("backend") == "postgres", f"config.example.yaml database.backend is {db.get('backend')!r}; PR2 requires 'postgres' as the default"
+    # The PG URL must come from the env (referenced as $DATABASE_URL),
+    # never hardcoded with credentials.
+    assert db.get("postgres_url") == "$DATABASE_URL", f"postgres_url should be '$DATABASE_URL' env reference, got {db.get('postgres_url')!r}"