add test for undocumented endpoint on Router

test/router.spec.ts

@@ -0,0 +1,54 @@
+import * as express from 'express';
+import { expect } from 'chai';
+import * as request from 'supertest';
+import { OpenApiValidator } from '../src';
+
+describe('security.defaults', () => {
+  let app = express();
+  let basePath = '/api';
+  let server = null;
+
+  before(async () => {
+    const router = express.Router();
+    await new OpenApiValidator({
+      apiSpec: {
+        openapi: '3.0.0',
+        info: { version: '1.0.0', title: 'test bug OpenApiValidator' },
+        servers: [{ url: 'http://localhost:8080/api/' }],
+        paths: {
+          '/': { get: { responses: { 200: { description: 'home api' } } } },
+        },
+      },
+    }).install(router);
+
+    router.get('/', (req, res) => res.status(200).send('home api\n'));
+    router.get('/notDefined', (req, res) =>
+      res.status(200).send('url api not defined\n'),
+    );
+
+    app.get('/', (req, res) => res.status(200).send('home\n'));
+    app.use(basePath, router);
+
+    app.use((err, req, res, next) => {
+      // console.error(err);
+      res.status(err.status ?? 500).json({
+        message: err.message,
+        errors: err.errors,
+      });
+    });
+
+    server = app.listen(3000);
+    console.log('server start port 3000');
+  });
+
+  after(async () => server.close());
+
+  it('should return 404 for undocumented route when using Router', async () => {
+    return request(app)
+      .get(`${basePath}/notDefined`)
+      .expect(404)
+      .then((r) => {
+        expect(r.body).to.have.property('message').that.equals('not found');
+      });
+  });
+});