diff --git a/.github/workflows/x-tests.yml b/.github/workflows/x-tests.yml
new file mode 100644
index 00000000..f657d478
--- /dev/null
+++ b/.github/workflows/x-tests.yml
@@ -0,0 +1,40 @@
+name: apps/x tests
+
+on:
+  pull_request:
+    paths:
+      - "apps/x/**"
+      - ".github/workflows/x-tests.yml"
+  push:
+    branches: [main]
+    paths:
+      - "apps/x/**"
+      - ".github/workflows/x-tests.yml"
+  workflow_dispatch:
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    defaults:
+      run:
+        working-directory: apps/x
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: pnpm/action-setup@v4
+        with:
+          version: 10
+
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 22
+          cache: pnpm
+          cache-dependency-path: apps/x/pnpm-lock.yaml
+
+      - name: Install dependencies
+        run: pnpm install --frozen-lockfile
+
+      # Builds @x/shared (core/renderer tests import its dist), then runs
+      # the shared, core, and renderer vitest suites in order.
+      - name: Run tests
+        run: npm test
diff --git a/apps/x/package.json b/apps/x/package.json
index 5d875653..d0931dc7 100644
--- a/apps/x/package.json
+++ b/apps/x/package.json
@@ -12,7 +12,11 @@
     "deps": "npm run shared && npm run core && npm run preload",
     "main": "wait-on http://localhost:5173 && cd apps/main && npm run build && npm run start",
     "lint": "eslint .",
-    "lint:fix": "eslint . --fix"
+    "lint:fix": "eslint . --fix",
+    "test": "npm run shared && npm run test:shared && npm run test:core && npm run test:renderer",
+    "test:shared": "cd packages/shared && npm test",
+    "test:core": "cd packages/core && npm test",
+    "test:renderer": "cd apps/renderer && npm test"
   },
   "devDependencies": {
     "@eslint/js": "^9.39.2",
@@ -26,4 +30,4 @@
     "typescript-eslint": "^8.50.1",
     "wait-on": "^9.0.3"
   }
-}
\ No newline at end of file
+}