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cmux-testing — Claude Code skill: Swift testing and test wiring

Skill for choosing verification scopes, adding tests, and validating Swift test targets in the cmux project. Decides what local and CI evidence a change needs.

Install into Claude Code · Skills CLI (Vercel) All methods and platforms ↓ 
npx skills add manaflow-ai/cmux --skill cmux-testing -a claude-code
Open on GitHub

What cmux-testing does

cmux-testing provides commands to run checks at different scales: from parsing changed Swift code to the full CI static recipe. Inside the repository, scripts like verify-local.py handle syntax and test-file wiring, ui-test captures UI test frames, ui-lab.py renders views to PNG without building the app, and run-e2e.sh runs E2E scenarios with screenshots.

The skill teaches you to distinguish between local and CI checks: package, native, web, or runtime. It helps you isolate a failing behavior to one focused test, then verify the fix runs the same command. For new test files in cmuxTests/, wiring in project.pbxproj is required—the skill shows how via sync-test-wiring or lint-pbxproj-test-wiring.sh.

One hard requirement: repository commands run only from a trusted checkout; even --help loads project code. Swift tests must use Swift Testing (import Testing, @Test), UI tests stay in XCTest/XCUITest. Never assert AST shape or metadata keys as a mirror of implementation—you need a real behavioral oracle or artifact.

What it helps with

  • choose the right verification scope for local testing
  • validate Swift test file wiring in the project
  • isolate and fix a bug with proof of the regression
  • render views to images without building the app
  • tell if a web test failure is real or a flake

Example prompts for the agent

  • Help me decide if this change needs local tests
  • Set up cmux-testing and show me how to run a focused test for this feature
  • I added a new file to cmuxTests—how do I verify it's wired correctly?

How to install cmux-testing

1Skills CLI (Vercel)

npx skills add manaflow-ai/cmux --skill cmux-testing -a claude-code

2Manually: put the files in place

~/.claude/skills/cmux-testing/SKILL.md

Copy the whole skill folder; for one project use .claude/skills/cmux-testing/

From the same set12

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Questions about cmux-testing

How do I install cmux-testing in Claude Code?

Run npx skills add manaflow-ai/cmux --skill cmux-testing -a claude-code, then find ~/.claude/skills/cmux-testing/SKILL.md.

What does cmux-testing do?

It provides commands to pick verification scopes (syntax, tests, wiring), isolate bugs, and validate Swift targets in cmux. It helps you decide what local or CI evidence a change requires.

Should I migrate XCTest to Swift Testing?

Swift Testing is used for new unit and integration targets. Migrate XCTest only if you're already editing that file. UI tests remain in XCTest/XCUITest.

See also

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