Add test for server entry file

backend/tests/server.test.ts

@@ -0,0 +1,51 @@
+import request from 'supertest';
+import { expect } from 'chai';
+import app from '../src/server';
+
+describe('Server', () => {
+  describe('GET /status', () => {
+    it('should return status', async () => {
+      const res = await request(app).get('/status');
+
+      expect(res.status).to.equal(200);
+      expect(res.body).to.have.property('status');
+    });
+  });
+
+  describe('GET /stats', () => {
+    it('should return stats', async () => {
+      const res = await request(app).get('/stats');
+
+      expect(res.status).to.equal(200);
+      expect(res.body).to.have.property('stats');
+    });
+  });
+
+  describe('GET /health', () => {
+    it('should return health status', async () => {
+      const res = await request(app).get('/health');
+
+      expect(res.status).to.equal(200);
+      expect(res.body).to.have.property('status', 'success');
+    });
+  });
+
+  describe('GET unknown route', () => {
+    it('should return 404', async () => {
+      const res = await request(app).get('/unknown');
+
+      expect(res.status).to.equal(404);
+      expect(res.body).to.have.property('message');
+    });
+  });
+
+  describe('Error handling', () => {
+    it('should handle errors', async () => {
+      // Cause an error
+      const res = await request(app).get('/error');
+
+      expect(res.status).to.equal(500);
+      expect(res.body).to.have.property('message');
+    });
+  });
+});