Repro Replay

Repro replay fixtures validate deterministic headless record/replay behavior.

Fixture Source

• replay fixtures: packages/testkit/fixtures/repro/*.json
• primary replay harness test: packages/core/src/repro/__tests__/replay.harness.test.ts

The fixture currently exercised by the harness is:

• packages/testkit/fixtures/repro/replay_resize_tab_text.json

CI Gate

Every PR runs an explicit replay gate in .github/workflows/ci.yml:

• job: node / ubuntu-latest
• step: Repro replay fixtures (headless, explicit gate)
• command:

node --test --test-concurrency=1 packages/core/dist/repro/__tests__/replay.harness.test.js

npm run test also covers this area, but this dedicated step keeps replay coverage visible as a standalone gate.

Local Run

npm ci
npm run build
node --test --test-concurrency=1 packages/core/dist/repro/__tests__/replay.harness.test.js

Optional schema/version checks:

node --test --test-concurrency=1 packages/core/dist/repro/__tests__/schema.versioning.test.js

Updating Replay Fixtures

Follow the golden fixture policy in packages/testkit/fixtures/README.md:

1. Update fixture JSON intentionally (no auto-regeneration in committed tests).
2. Re-run replay harness and related tests.
3. Include fixture diff context and reasoning in the PR.