---
title: '05 — Middleware & Utilities'
description: 'Description of the middleware and utility components of the CalMiner application.'
status: draft
---

- **Middleware** (`middleware/validation.py`): applies JSON validation before requests reach routers.
- **Testing** (`tests/unit/`): pytest suite covering route and service behavior, including UI rendering checks and negative-path router validation tests to ensure consistent HTTP error semantics. Playwright end-to-end coverage is planned for core smoke flows (dashboard load, scenario inputs, reporting) and will attach in CI once scaffolding is completed.