TESTING

A months-long, 500B+ token agent project only worked once a byte-matching PASS/FAIL check replaced the reviewer agent. What an agent harness needs, what agents did to cheat it, and what to copy on Monday.

A new ASE 2026 framework injects server errors, truncated responses, and corrupted tool calls into live agent systems at the HTTP layer. Every system degrades, pass@1 drops up to 50 points, and the ranking stays the same no matter which LLM is behind it.

A fair comparison of AI-assisted test generation tools for coding agents - what they generate, where they plug into your workflow, and which claims to verify yourself before trusting the output.

Dan Luu's new agentic coding essay is not another vibe check. It is a useful reminder that coding agents only compound when the test loop, review loop, and task-selection loop are stronger than the code generator.

Vite-native test runner. Jest-compatible API, instant HMR for tests, native ESM and TypeScript, and built-in coverage. Default for new Vite and Next.js projects.

The long-standing JavaScript test framework from Meta. Snapshots, mocks, parallelism, and the broadest plugin ecosystem in the JS testing world.

Modern browser automation from Microsoft. Auto-wait, role-based selectors, cross-browser, fast in CI.

Visual testing tool for Model Context Protocol servers. Like Postman for MCP - call tools, browse resources, and view real-time logs in a browser UI. Zero install via npx.

Step-by-step guide to building an MCP server in TypeScript - from project setup to tool definitions, resource handling, testing, and deployment.