Enforce contract-based test writing for Python functions, models, APIs, and integrations.
npx skills add https://github.com/cncorp/arsenal --skill test-writer-cncorp
Please help me install this Agent Skill. Skill: test-writer Source: https://github.com/cncorp/arsenal/tree/main/dot-claude/skills/test-writer Command: npx skills add https://github.com/cncorp/arsenal --skill test-writer-cncorp
This Skill enforces good testing practices to produce robust, contract-focused tests and avoid brittle tests.
Follow test-writer guidelines before writing any test code, including analyzing the code and dependencies.
High-intent search queries and answers about installing and using this skill.
Contract-based testing verifies what your code guarantees, not how pytest or dependencies work internally. Focus tests on your function's input-output contracts, database model invariants, and API response guarantees rather than framework implementation details.
Proper fixture usage means creating reusable, explicit test data that isolates concerns and avoids framework-specific behavior. test-writer enforces fixture patterns that prevent brittle tests and ensure your fixtures reflect actual business requirements.
Brittle tests fail when implementation details change, not when contracts break. Enforce contract coverage across pure functions, database models, and external integrations by defining explicit business guarantees upfront, then verify those guarantees—not implementation specifics.
Yes. Contract-based testing applies across pure functions, database models, APIs, and external integrations in Python projects. test-writer guides fixture usage and contract coverage for all these contexts, ensuring tests remain robust as implementations evolve.
Mandatory review after test creation checks that fixtures are appropriate, contracts are explicit, tests cover your code's guarantees rather than library behavior, and coverage is complete. This prevents tests from becoming brittle as requirements or dependencies change.
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