test: switch to placeholder-based validation for DB path

Author: ttnsy

Makefile

@@ -1,14 +1,24 @@
 from pathlib import Path
 
-from pydantic_settings import BaseSettings, SettingsConfigDict
+from pydantic import field_validator
+from pydantic_settings import BaseSettings
 
 UPLOAD_DIR = Path("data")
 
+# Used to catch missing DB_PATH.
+# If this value is still set, it means DB_PATH wasn't configured.
+DEFAULT_DB_PLACEHOLDER = "__MISSING_DB_PATH__"
+
 
 class Settings(BaseSettings):
-    db_path: str = "database.db"
+    db_path: str = DEFAULT_DB_PLACEHOLDER
 
-    model_config = SettingsConfigDict(env_file=".env")  #' Optional
+    @field_validator("db_path", mode="before")
+    @classmethod
+    def validate_db_path(cls, value):
+        if value == DEFAULT_DB_PLACEHOLDER:
+            raise ValueError("You must set DB_PATH in your environment or .env file.")
+        return value
 
 
 settings = Settings()

app/config.py

@@ -18,4 +18,5 @@ dependencies = [
 dev = [
     "ipykernel>=6.29.5",
     "pytest>=8.3.5",
+    "pytest-env>=1.1.5",
 ]

pyproject.toml

@@ -0,0 +1,4 @@
+[pytest]
+env =
+    ENV=test
+    DB_PATH=test.db

pytest.ini

@@ -16,10 +16,9 @@
 
 @pytest.fixture(scope="session", autouse=True)
 def setup_test_db():
-    os.environ["DB_PATH"] = "test.db"
     init_db()
     yield
-    Path("test.db").unlink(missing_ok=True)
+    Path(os.getenv("DB_PATH")).unlink(missing_ok=True)
 
 
 @pytest.fixture