diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
new file mode 100644
index 000000000..40b9e5bd8
--- /dev/null
+++ b/.github/workflows/tests.yml
@@ -0,0 +1,31 @@
+name: Tests
+
+on:
+  push:
+  pull_request:
+
+jobs:
+  vitest:
+    name: vitest
+    runs-on: ubuntu-latest
+    timeout-minutes: 30
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Set up Node
+        uses: actions/setup-node@v4
+        with:
+          # Matches the version the standalone release build uses; the repo has
+          # no .nvmrc or "engines" field to read it from.
+          node-version: 22
+          cache: npm
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Run test suite
+        # forks + a small worker count keeps the load-sensitive component tests
+        # from timing out on the shared runners; the longer per-test timeout
+        # covers the jsdom-heavy suites.
+        run: npx vitest run --pool=forks --maxWorkers=2 --testTimeout=15000