Claude Code write-unit-tests for C# boundaries

Organize unit tests with arrange, act, and assert. Cover normal values, edge cases and expected errors.

Install in Claude Code

Open a C# project with xUnit or its established test framework. Use existing doubles and assertion libraries where needed.

Review `.claude/skills/write-unit-tests/SKILL.md` and its requirements at the pinned GitHub commit.
Create `.claude/skills/write-unit-tests/` in your project and save the reviewed file as `.claude/skills/write-unit-tests/SKILL.md`.
Start Claude Code from that project's root, then select `/write-unit-tests` in the slash menu.

Example task

Pure function range-15 allows event capacity from 1 through 40. Test {minimum: 1, maximum: 40, aboveMaximum: 41}.

What to check

Verify {accept: [1, 40], reject: [41]} for the specified behavior. Put rejection in a named independent scenario that states what should happen.

Original SKILL.md on GitHub · Updated 2026-11-14

Frequently asked question

Do boundary tests always need mocks?

Call a pure function and assert the result directly. Use a test double when an external dependency needs isolation and is outside the behavior under test.