fix(ci): test stale chunks in split bundle (#11595)

The V8 coverage build inlines every dynamic import, so the stale chunk tests cannot intercept a page chunk. Run those tests against the normal code-split bundle and exclude them from the inlined coverage pass.

Assisted-by: Codex:gpt-5

Co-authored-by: localai-org-maint-bot <306269227+localai-org-maint-bot@users.noreply.github.com>

.github/workflows/tests-ui-e2e.yml

@@ -52,6 +52,8 @@ jobs:
         run: |
           sudo apt-get update
           sudo apt-get install -y build-essential libopus-dev
+      - name: Run stale chunk recovery tests
+        run: PATH="$PATH:$HOME/go/bin" make test-ui-stale-chunk
       # Builds an instrumented UI bundle, runs the Playwright specs, and fails
       # if line coverage regressed beyond the jitter tolerance (the gate is
       # in `make test-ui-coverage-check`). PLAYWRIGHT_CHROMIUM_PATH is unset

Makefile

@@ -103,7 +103,7 @@ COVERAGE_E2E_LABELS?=!real-models
 COVERAGE_EXCLUDE_RE?=grpc/proto/.*[.]pb[.]go
 
 
-.PHONY: all test test-coverage test-coverage-baseline test-coverage-check test-backend-cpp test-build-scripts test-ui test-ui-coverage-baseline test-ui-coverage-check build vendor lint lint-all
+.PHONY: all test test-coverage test-coverage-baseline test-coverage-check test-backend-cpp test-build-scripts test-ui test-ui-stale-chunk test-ui-coverage-baseline test-ui-coverage-check build vendor lint lint-all
 
 all: help
 
@@ -1517,6 +1517,13 @@ test-ui: build-mock-backend protogen-go
 	$(GOCMD) build -o tests/e2e-ui/ui-test-server ./tests/e2e-ui
 	cd core/http/react-ui && sh $(CURDIR)/scripts/ensure-playwright-browser.sh && bunx playwright test $(PLAYWRIGHT_WORKERS_FLAG)
 
+## The stale-chunk specs need the production code-split bundle. The V8 coverage
+## bundle below inlines dynamic imports to keep every page in its denominator.
+test-ui-stale-chunk: build-mock-backend protogen-go
+	cd core/http/react-ui && bun install && bun run build
+	$(GOCMD) build -o tests/e2e-ui/ui-test-server ./tests/e2e-ui
+	cd core/http/react-ui && sh $(CURDIR)/scripts/ensure-playwright-browser.sh && bunx playwright test --grep @production-chunks --workers=1
+
 ## React UI code coverage from the Playwright e2e suite. Builds a
 ## NON-instrumented bundle with source maps (COVERAGE_V8=true), re-embeds it
 ## into the ui-test-server (the dist is //go:embed'ed at compile time), runs the
@@ -1532,7 +1539,7 @@ test-ui-coverage: build-mock-backend protogen-go
 	$(GOCMD) build -o tests/e2e-ui/ui-test-server ./tests/e2e-ui && \
 	( cd core/http/react-ui && rm -rf .nyc_output coverage && \
 	    sh $(CURDIR)/scripts/ensure-playwright-browser.sh && \
-	    PW_V8_COVERAGE=1 bunx playwright test $(PLAYWRIGHT_WORKERS_FLAG) && bun run coverage:report )
+	    PW_V8_COVERAGE=1 bunx playwright test --grep-invert @production-chunks $(PLAYWRIGHT_WORKERS_FLAG) && bun run coverage:report )
 
 ## UI coverage baseline (committed) and the strict gate that compares against
 ## it — the React mirror of test-coverage-baseline / test-coverage-check.

core/http/react-ui/e2e/stale-chunk-recovery.spec.js

@@ -12,7 +12,7 @@ import { test, expect } from './coverage-fixtures.js'
 // error instead of reloading forever.
 const HOME_CHUNK = /\/assets\/Home-[^/]*\.js(\?.*)?$/
 
-test.describe('Stale chunk recovery', () => {
+test.describe('@production-chunks Stale chunk recovery', () => {
   test('a 404 on a page chunk recovers on its own', async ({ page }) => {
     let served404 = 0
     await page.route(HOME_CHUNK, route => {