Add test cases

.github/workflows/test.yml

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+name: Test
+
+on:
+  push:
+    branches: [ main ]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: 20
+      - name: Install dependencies
+        run: npm install
+      - name: Run without the shelljs module as external
+        run: npm run start
+      - name: Run with the shelljs module as external
+        run: npm run start-ext
+        if: failure()

build-ext.mjs

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+import { build } from 'esbuild'
+
+await build({
+  entryPoints: ['./src/index.js'],
+  outfile: './dist/index.js',
+  bundle: true,
+  platform: "node",
+  target: "node16",
+  allowOverwrite: true,
+  external: ['shelljs']
+});

build.mjs

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+import { build } from 'esbuild'
+
+await build({
+  entryPoints: ['./src/index.js'],
+  outfile: './dist/index.js',
+  bundle: true,
+  platform: "node",
+  target: "node16",
+  allowOverwrite: true
+});