Add vacuous test

.github/workflows/run-tests.yml

@@ -0,0 +1,23 @@
+name: Twelf-Wasm Unit Tests
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+  workflow_dispatch:
+
+jobs:
+  build-test:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Use Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: 16.x
+
+      - name: Run tests
+        run: npm install && npx jest

jest.config.js

@@ -0,0 +1,16 @@
+module.exports = {
+  transform: {
+    '^.+\\.ts?$':
+    ['ts-jest',
+     {
+       isolatedModules: true,
+     }
+    ]
+  },
+  testEnvironment: 'node',
+  globals: {
+    devicePixelRatio: 1,
+  },
+  testRegex: '/tests/test-.*\\.(ts|tsx)$',
+  moduleFileExtensions: ['ts', 'tsx', 'js', 'jsx', 'json', 'node'],
+};