use jest for CI

test/web/webInterface.spec.js

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+const WebInterface = require('../../lib/webInterface.js');
+const Recorder = require('../../lib/recorder');
+const urllib = require('urllib');
+
+describe('WebInterface server', () => {
+  let webServer = null;
+  const webHost = 'http://127.0.0.1:8002'
+
+  beforeAll(async () => {
+    const recorder = new Recorder();
+    webServer = new WebInterface({
+      webPort: 8002,
+    }, recorder);
+    await webServer.start();
+  });
+
+  afterAll(async () => {
+    await webServer.close();
+  });
+
+  it('should response qrcode string in /getQrCode', async () => {
+    const response = await urllib.request(`${webHost}/api/getQrCode`);
+    const body = JSON.parse(response.res.data);
+    expect(body.qrImgDom).toMatch('<img src="data:image/');
+    expect(body.url).toBe(`${webHost}/downloadCrt`);
+  });
+});