add tests

.babelrc

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+{
+  "presets": [
+    ["@babel/preset-env", {
+      "targets": {
+        "node": "current"
+      }
+    }]
+  ]
+}

.github/workflows/test.yml

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+name: Test
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+
+    services:
+      vllm:
+        image: vllm/vllm-openai:latest
+        options: >-
+          --ipc=host
+        env:
+          MODEL: HuggingFaceTB/SmolLM2-135M-Instruct
+        ports:
+          - 8000:8000
+
+    steps:
+    - uses: actions/checkout@v3
+
+    - name: Set up Node.js
+      uses: actions/setup-node@v3
+      with:
+        node-version: '18'
+        cache: 'npm'
+
+    - name: Install dependencies
+      run: npm ci
+
+    - name: Wait for vLLM to be ready
+      run: |
+        timeout 300 bash -c '
+        until curl -s http://localhost:8000/health; do
+          echo "Waiting for vLLM..."
+          sleep 5
+        done'
+
+    - name: Run tests
+      run: npm test

babel.config.cjs

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+module.exports = {
+  presets: [
+    ['@babel/preset-env', {
+      targets: {
+        node: 'current'
+      }
+    }]
+  ],
+  plugins: [
+    '@babel/plugin-transform-modules-commonjs'
+  ]
+};

jest.config.cjs

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+module.exports = {
+  testEnvironment: 'jsdom',
+  transform: {
+    '^.+\\.js$': ['babel-jest', { configFile: './babel.config.cjs' }]
+  },
+  moduleNameMapper: {
+    '\\.(css|less)$': '<rootDir>/tests/mocks/styleMock.cjs'
+  },
+  setupFiles: ['<rootDir>/tests/setup.js'],
+  testMatch: ['**/__tests__/**/*.js', '**/?(*.)+(spec|test).js'],
+  transformIgnorePatterns: [
+    'node_modules/(?!(module-that-needs-to-be-transformed)/)'
+  ]
+};