diff --git a/.github/workflows/validate.yml b/.github/workflows/validate.yml
index e0efb1b79..0ee8d45b5 100644
--- a/.github/workflows/validate.yml
+++ b/.github/workflows/validate.yml
@@ -81,17 +81,28 @@ jobs:
       - name: ⎔ Setup node
         uses: actions/setup-node@v4
         with:
-          node-version: 26
+          # The workshop's pinned MSW/Undici stack has an AbortSignal realm
+          # incompatibility on Node 26. Node 22 is supported by package.json.
+          node-version: 22
 
       - name: 📦 Install dependencies
         run: npm ci
 
-      # Workshops ship epicshop/test.js (not .ts). `..s` runs solution apps only.
+      - name: 🏗 Prepare solution tests
+        env:
+          SKIP_PLAYWRIGHT: true
+          SKIP_PLAYGROUND: true
+        run: npm run setup:custom
+
+      # Exercises 1–3 contain Playwright suites, which cannot be collected by
+      # their `npm test` Vitest command. Run every test in the completed Vitest
+      # solution for exercises 4–11; intermediate steps can intentionally
+      # demonstrate failing tests that later steps fix.
       - name: 🧪 Run solution tests
         run: |
           set -euo pipefail
           if [ -f ./epicshop/test.js ]; then
-            node ./epicshop/test.js ..s
+            node ./epicshop/test.js '4.4.s,5.2.s,6.2.s,7.2.s,8.3.s,9.3.s,10.1.s,11.3.s'
           else
             echo "No epicshop/test.js in this workshop; skipping solution-app test runner."
           fi
diff --git a/exercises/11.test-db/03.solution.global-setup/app/routes/users+/$username.test.tsx b/exercises/11.test-db/03.solution.global-setup/app/routes/users+/$username.test.tsx
index ece39b4b5..fc7250785 100644
--- a/exercises/11.test-db/03.solution.global-setup/app/routes/users+/$username.test.tsx
+++ b/exercises/11.test-db/03.solution.global-setup/app/routes/users+/$username.test.tsx
@@ -80,9 +80,6 @@ test('The user profile when logged in as self', async () => {
 				args.request.headers.set('cookie', cookieHeader)
 				return rootLoader(args)
 			},
-			Component: function TestComponent() {
-				return <div>Test Component</div>
-			},
 			children: [
 				{
 					path: 'users/:username',