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Testing behavior, not implementation v1.0.0

Use this resource to write tests that survive an internal refactoring

New

  • 562 downloads
  • 178 likes
  • 107 saves

Free

Install with the CLI

In a terminal, from the folder you want:

npx --yes palatekit@latest install write-tests-for-observable-behavior

With no option, the skill goes to ~/.agents/skills/; add --agent claude-code (or codex, cursor…) to target an agent.

First time: connect the CLI with

npx --yes palatekit@latest login

The agent judges each test against two imagined edits: breaking the behavior, or changing internals with no visible effect. It removes tests that only protect implementation details.

Mostly picked by

Updated November 2, 2026

Card for the “Testing behavior, not implementation” skill

Details

Works in
Install guides
Generates with
Your agent's model
Licence
MIT

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What you get

  • SKILL.md: criteria for observable behavior and two edit checks
  • SKILL.md: rules for removing implementation tests

Good fit for

  • Every refactoring breaks tests without changing the result
  • A test suite checks the internal call order

Not for

    Tags

    • tests
    • behavior
    • refactoring
    • quality

    About

    You say

    “Rewrite these tests to check the invoice produced, not the internal functions.”

    Card for the “Testing behavior, not implementation” skill

    Skill published by backnotprop under the MIT license, delivered in its original version.

    Show more

    How to use it

    1. Install the skill in your agent's skills folder
    2. Ask your agent to write tests that survive an internal refactoring
    3. Review and adjust the result

    Content preview

    Files

    • LICENSE1.1 KB
    • NOTICE-PALATEKIT.md0.5 KB
    • SKILL.md2.6 KB

    Origin and licence

    Listed unmodified

    Author
    backnotprop
    Source
    github.com/backnotprop/pstack/tree/23707a30f9cd2f12edef61f2506e2222e30b35aa/skills/principle-test-behavior-not-implementation
    Licence
    MIT

    Notice

    « principle-test-behavior-not-implementation » (backnotprop, MIT) livré dans sa version d'origine : fiche en français et en anglais par PalateKit.

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