Add TestServer

e2e/lib/TestServer.ts

@@ -0,0 +1,52 @@
+import * as http from 'http';
+import * as net from 'net'
+import express from 'express';
+
+type HandlerFunc = (req: express.Request, res: express.Response) => void;
+
+export default class TestServer {
+  private http?: http.Server;
+
+  private app: express.Application;
+
+  constructor(
+    private port = 0,
+    private address = '127.0.0.1',
+  ){
+    this.app = express();
+  }
+
+  handle(path: string, f: HandlerFunc): TestServer {
+    this.app.get(path, f);
+    return this;
+  }
+
+  receiveContent(path: string, content: string): TestServer {
+    this.app.get(path, (_req: express.Request, res: express.Response) => {
+      res.status(200).send(content)
+    });
+    return this;
+  }
+  
+  url(path: string = '/'): string {
+    if (!this.http) {
+      throw new Error('http server not started');
+    }
+
+    let addr = this.http.address() as net.AddressInfo;
+    return `http://${addr.address}:${addr.port}${path}`
+  }
+
+  listen() {
+    this.http = http.createServer(this.app)
+    this.http.listen(this.port, this.address);
+  }
+
+  close(): void {
+    if (!this.http) {
+      return;
+    }
+    this.http.close();
+    this.http = undefined;
+  }
+}