test: unit tests for config, filters, client and inventory building

pytest suite with mocked NetBox API responses, plus a makefile driving
venv setup, tests, linting and formatting.

netbox_inventory.py

@@ -100,9 +100,7 @@ class NetBoxClient:
         except requests.exceptions.RequestException as exc:
             raise NetBoxAPIError(f"NetBox API request failed: {exc}") from exc
         if response.status_code != 200:
-            raise NetBoxAPIError(
-                _extract_error_message(response), status_code=response.status_code
-            )
+            raise NetBoxAPIError(_extract_error_message(response), status_code=response.status_code)
         try:
             return response.json()
         except ValueError as exc:
@@ -235,9 +233,7 @@ def validate_options(source: str, filter_name: str, filter_value: str) -> None:
         raise InventoryError(f'Filter "{filter_name}" requires a value.')
 
 
-def server_side_params(
-    client: NetBoxClient, filter_name: str, filter_value: str
-) -> dict[str, Any]:
+def server_side_params(client: NetBoxClient, filter_name: str, filter_value: str) -> dict[str, Any]:
     """Translate name-based filters into NetBox API query parameters."""
     if filter_name == "tenant":
         return {"tenant_id": client.resolve_id("tenancy/tenants", filter_value, "tenant")}