---name: cmux-testingdescription: Choose scoped cmux verification, add behavioral tests, and validate Swift test targets and wiring. Use when adding tests or deciding what local/CI evidence a change needs.---

cmux Testing

Choose the first check

Run repository commands only from a trusted checkout; even verify-local.py --help and --list load repository code.

Task	Command
Choose checks and parse changed Swift	python3 scripts/verify-local.py
Run the full CI static recipe	python3 scripts/verify-local.py --all
Parse current Swift edits	python3 scripts/verify-local.py --only swift-syntax --swift-changed
Check new Swift test-file wiring	python3 scripts/verify-local.py --only test-wiring
See what a UI test did, one frame per action	scripts/ui-test ClassName or scripts/ui-test <run URL> (guide)
Render view code to PNGs in seconds, light and dark, without building the app	scripts/ui-lab/ui-lab.py <harness> [--watch] (guide)
Dogfood the app from CI: drive it with a JSON tour and get screenshots and accessibility trees	scripts/run-e2e.sh --scenario dogfood/scenarios/<tour>.json --ref <sha> --frames (guide)
Read the screenshots and GIF CI posted of an app PR's build before merging it	the PR's dogfood comment (guide)

Add a base ref after --swift-changed to include committed changes. Use --list to find other checks and --help for options. Parsing checks syntax; it doesn't typecheck or run tests.

Read the command guide for piped paths or JSON receipts. Use the validation guide to choose package, native, web or runtime checks. Docs and portable tooling use their scoped checks.

Reproduce and repair

Keep a focused command that fails on the reported symptom, then rerun it after the repair. Setup failures and zero executed tests don't demonstrate the bug. Exercise one behavior at a time so a failure identifies what needs fixing.

Keep two commits: first the failing behavioral regression, then the fix. Run the same focused command on both and record the commit SHAs, the expected failure and the passing result. A setup failure or zero executed tests is not regression proof. When the proof is available locally, push both commits together after the fix passes; a separate hosted CI run on the deliberately broken intermediate commit is unnecessary. If the failure only reproduces in CI, use that lane and keep its receipts. Required CI and review still apply to the final pushed head.

Test wiring

New cmuxTests/*.swift files need both PBXFileReference and Sources build-phase membership in cmux.xcodeproj/project.pbxproj. Add through Xcode or follow a wired sibling, then run the wiring check above: an unwired file can otherwise produce a misleading zero-test pass.

After creating, renaming, or deleting a direct cmuxTests/*.swift file, run ./scripts/sync-test-wiring. It deterministically reconciles the PBXFileReference, PBXBuildFile, cmuxTests group child, and cmuxTests Sources membership; --check performs the same validation without writing. Foreign target membership is rejected with an explicit diagnostic. New Sources/**/*.swift app files are wired with ./scripts/wire-app-sources.py (--check lists unwired ones); UI tests with --target cmuxUITests --dir cmuxUITests; run it after any merge that took main's project.pbxproj, which drops a branch's app-source entries. The workflow-guard-tests CI job still runs ./scripts/lint-pbxproj-test-wiring.sh as a defensive Sources-phase guard.

Test quality

• Exercise observable behavior through unit, integration, CLI or end-to-end paths.
• Do not assert source snippets, signatures, AST shape or metadata keys solely to mirror implementation. For metadata behavior, inspect the produced artifact or execute the code that consumes it.
• Add a small runtime harness when needed; skip a fake regression test if there is no meaningful behavioral oracle and explain the limit. See regression and quality for the judgment call.

Swift tests

Swift unit/integration targets use Swift Testing (import Testing, @Test, @Suite, #expect, #require). Portable Python/shell guards retain their existing frameworks. UI tests remain XCTest/XCUITest; do not migrate XCUIApplication tests.

New Swift package test targets start on Swift Testing. Prefer parameterized tests for repeated cases and tags for selection. Use .serialized for suites that require ordering, not locks or sleeps. Migrate an existing XCTest file only when an edit already crosses it; see the migration mapping.

Native test evidence

An app build does not compile test targets. Package/refactor and public API changes need the relevant test target compiled, then the selected tests actually executed. Follow build-for-testing and execution guidance; report skipped/unsupported checks explicitly.

For remote tmux sizing changes, use the E2E recipe.

PR CI labels

Normal PR CI already runs the suites a diff edits or touches. full-ci and unit-ci are not review or merge requirements; see PR CI coverage before adding either.