Add some tests for proxy support

package.json

@@ -63,6 +63,7 @@
     "eslint-plugin-jsx-a11y": "^6.6.1",
     "eslint-plugin-react": "^7.30.1",
     "eslint-plugin-react-hooks": "^4.6.0",
+    "http-proxy": "^1.18.1",
     "mocha": "^10.2.0",
     "nyc": "^15.1.0",
     "prettier": "^2.8.4",

tests/e2e/proxy.test.js

@@ -0,0 +1,75 @@
+const { expect } = require('chai');
+const sinon = require('sinon');
+const httpProxy = require('http-proxy');
+const https = require('https');
+const config = require('./utils/config');
+const { DBSQLClient } = require('../..');
+
+class HttpProxyMock {
+  constructor(target, port) {
+    this.requests = [];
+
+    this.config = {
+      protocol: 'http',
+      host: 'localhost',
+      port,
+    };
+
+    this.target = `https://${config.host}`;
+
+    this.proxy = httpProxy.createServer({
+      target: this.target,
+      agent: new https.Agent({
+        rejectUnauthorized: false,
+      }),
+    });
+
+    this.proxy.on('proxyRes', (proxyRes) => {
+      const req = proxyRes.req;
+      this.requests.push({
+        method: req.method?.toUpperCase(),
+        url: `${req.protocol}//${req.host}${req.path}`,
+        requestHeaders: { ...req.getHeaders() },
+        responseHeaders: proxyRes.headers,
+      });
+    });
+
+    this.proxy.listen(port);
+    console.log(`Proxy listening at ${this.config.host}:${this.config.port} -> ${this.target}`);
+  }
+
+  close() {
+    this.proxy.close(() => {
+      console.log(`Proxy stopped at ${this.config.host}:${this.config.port}`);
+    });
+  }
+}
+
+describe('Proxy', () => {
+  it('should use http proxy', async () => {
+    const proxy = new HttpProxyMock(`https://${config.host}`, 9090);
+    try {
+      const client = new DBSQLClient();
+      const clientConfig = client.getConfig();
+      sinon.stub(client, 'getConfig').returns(clientConfig);
+
+      const connection = await client.connect({
+        host: config.host,
+        path: config.path,
+        token: config.token,
+        proxy: proxy.config,
+      });
+
+      const session = await connection.openSession({
+        initialCatalog: config.database[0],
+        initialSchema: config.database[1],
+      });
+
+      expect(proxy.requests.length).to.be.gte(1);
+      expect(proxy.requests[0].method).to.be.eq('POST');
+      expect(proxy.requests[0].url).to.be.eq(`https://${config.host}${config.path}`);
+    } finally {
+      proxy.close();
+    }
+  });
+});

tests/e2e/timeouts.test.js

@@ -25,7 +25,7 @@ async function openSession(socketTimeout, customConfig) {
   });
 }
 
-describe('Data fetching', () => {
+describe('Timeouts', () => {
   const socketTimeout = 1; // minimum value to make sure any request will time out
 
   it('should use default socket timeout', async () => {