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Testing · nxtg-ai

skill

How to WRITE real, maintainable tests in any stack — assertions that fail when the code is broken, the test pyramid and AAA structure, behavior-over-implementation, mocking discipline, fixtures, coverage that means something, and the ship gates (test-count-never-decrease, no self-mocking, prove-RED-first). Language-generic with concrete examples in TypeScript/JavaScript, Python, Rust, and Go. Use when asked to "add tests", "write a test", "improve coverage", "fix a flaky test", "how do I test X", when turning a hollow assertion into a real one, deciding what layer a test belongs in, or when a change must not drop test quality. …

Works with: Claude Code (native)  ·  Cursor, Codex CLI (manual)
native: this artifact type is that client's own format

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Install (Claude Code):

cp -r testing ~/.claude/skills/

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Its SKILL.md says when to use it, shows worked examples and states a limitation.

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source ↗  ·  skill:nxtg-ai/testing

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Measured 2026-08-25  ·  scorer s5  ·  how  ·  something wrong here?