ci: test before deploy

.github/workflows/demo.yml

@@ -11,6 +11,7 @@ jobs:
       - run: |
           yarn
           yarn build
+          yarn test
           cd examples/svelte
           yarn build
       - uses: peaceiris/actions-gh-pages@v2.5.1

.github/workflows/test.yml

@@ -1,8 +1,5 @@
 name: test
 on:
-  push:
-    branches:
-      - master
   pull_request:
     branches:
       - master