Implement unified story generation flow

backend/tests/test_config.py

@@ -0,0 +1,53 @@
+"""配置加载约定测试。"""
+
+from pathlib import Path
+
+from app.core.config import BACKEND_ENV_FILE, Settings
+
+
+def test_default_env_file_is_backend_env():
+    """默认 env 文件应固定为 backend/.env 的绝对路径。"""
+
+    configured_env_file = Path(Settings.model_config["env_file"])
+
+    assert configured_env_file == BACKEND_ENV_FILE
+    assert configured_env_file.is_absolute()
+    assert configured_env_file.parent.name == "backend"
+    assert configured_env_file.name == ".env"
+
+
+def test_explicit_env_file_ignores_current_working_directory_dotenv(monkeypatch, tmp_path):
+    """显式 env 文件不应被当前目录 .env 污染。"""
+
+    root_env = tmp_path / ".env"
+    root_env.write_text(
+        "\n".join(
+            [
+                "SECRET_KEY=root-env-should-not-be-used",
+                "DATABASE_URL=sqlite+aiosqlite:///root-env.db",
+                "DEBUG=false",
+            ]
+        ),
+        encoding="utf-8",
+    )
+    backend_env = tmp_path / "backend.env"
+    backend_env.write_text(
+        "\n".join(
+            [
+                "SECRET_KEY=backend-env-secret",
+                "DATABASE_URL=sqlite+aiosqlite:///backend-env.db",
+                "DEBUG=true",
+            ]
+        ),
+        encoding="utf-8",
+    )
+
+    monkeypatch.chdir(tmp_path)
+    monkeypatch.delenv("SECRET_KEY", raising=False)
+    monkeypatch.delenv("DATABASE_URL", raising=False)
+
+    settings = Settings(_env_file=backend_env)
+
+    assert settings.database_url == "sqlite+aiosqlite:///backend-env.db"
+    assert settings.secret_key == "backend-env-secret"
+    assert settings.debug is True