Testing developer tools
Every listing tagged testing, A to Z: 5 tools across 2 categories. Listed in alphabetical order, not ranked.
Armite
Local Azure emulator with a real identity plane and RBAC: Entra tokens, managed identity, ARM, Key Vault and Blob Storage behind one RBAC engine that returns 403 where Azure would, driven unmodified by az, the Azure SDKs and Terraform. Apache-2.0.
CATT
Consumer Agent Testing Tool: open-source (MIT) Python CLI that runs a scripted or model-driven surrogate assistant (Muse or Instinct emulation, unaffiliated) against your MCP server, MCP app, website or HTTP API, checks what the service actually did and records sealed evidence you can replay and diff in CI.
Cekura
Automated QA and observability for voice and chat AI agents: simulate conversations across personas before launch, monitor production calls for instruction-following and tool-call errors, and plug tests into CI/CD.
e2e by TesterArmy
Open-source (Apache-2.0) end-to-end testing framework for web, iOS and Android: describe a goal in plain language, an agent drives the app, and assertions verify the result; recorded steps replay with no model calls. From YC-backed TesterArmy.
Reticle
AI app testing that runs inside your app: it walks a flow like a user and reads network calls, app state and the console so your coding agent can verify its own work; free open-source SDK for Claude Code, Cursor and any MCP agent.