added test for dwn-server

tests/dwn-server.spec.ts

@@ -0,0 +1,36 @@
+import { expect } from 'chai';
+
+import { config } from '../src/config.js';
+import { DwnServer } from '../src/dwn-server.js';
+import { clear, dwn } from './test-dwn.js';
+
+describe('DwnServer', function () {
+  let dwnServer: DwnServer;
+  const options = {
+    dwn: dwn,
+    config: config,
+  };
+  before(function () {
+    dwnServer = new DwnServer(options);
+  });
+  after(async function () {
+    dwnServer.stop(() => console.log('server stop'));
+    await clear();
+  });
+  it('should create an instance of DwnServer', function () {
+    expect(dwnServer).to.be.an.instanceOf(DwnServer);
+  });
+
+  it('should start the server and listen on the specified port', async function () {
+    await dwnServer.start();
+    const response = await fetch('http://localhost:3000', {
+      method: 'GET',
+    });
+    expect(response.status).to.equal(200);
+  });
+  it('should stop the server', async function () {
+    dwnServer.stop(() => console.log('server Stop'));
+    // Add an assertion to check that the server has been stopped
+    expect(dwnServer.httpServer.listening).to.be.false;
+  });
+});