misc: add tests

.github/workflows/ci.yml

@@ -0,0 +1,36 @@
+name: Proxy Server CI
+
+on:
+  push:
+  pull_request:
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        node-version: [20.x, 22.x, 24.x, 25.x]
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Use Node.js ${{ matrix.node-version }}
+        uses: actions/setup-node@v4
+        with:
+          node-version: ${{ matrix.node-version }}
+          cache: 'npm'
+
+      - name: Install dependencies
+        run: npm install
+
+      - name: Run tests
+        run: npm test -- --ci
+
+      - name: Upload test results (optional)
+        if: failure()
+        uses: actions/upload-artifact@v4
+        with:
+          name: jest-results-${{ matrix.node-version }}
+          path: jest-results.json
+          if-no-files-found: ignore
+

README.md

@@ -133,7 +133,3 @@ With that, requests with path prefix `/api_v1` will be streamed to client 1, req
 ## Related
 
 A introduce article: [Building a HTTP Tunnel with WebSocket and Node.JS](https://medium.com/@embbnux/building-a-http-tunnel-with-websocket-and-node-js-98068b0225d3?source=friends_link&sk=985d90ec9f512928b34ed38b7ddcb378)
-
-## TODO
-
-- [ ] Add tests

jest.config.js

@@ -0,0 +1,9 @@
+/** @type {import('jest').Config} */
+module.exports = {
+  testEnvironment: 'node',
+  testMatch: ['**/tests/**/*.test.js'],
+  verbose: true,
+  testTimeout: 15000,
+  maxWorkers: 1,
+  globalTeardown: '<rootDir>/tests/globalTeardown.js',
+};