1. Keep session alive with ping-pong. 2. Refreshed tests.

backend/tests/cors.test.ts

@@ -3,12 +3,25 @@ import cors from 'cors';
 
 // Mock the express request, response, and next function
 const mockRequest = (origin: string | undefined) => {
-  return { header: (name: string) => (name === 'Origin' ? origin : undefined) } as Request;
+  return {
+    headers: {
+      origin: origin,
+    },
+    header: (name: string) => (name === 'Origin' ? origin : undefined)
+  } as Request;
 };
 
 const mockResponse = () => {
+  const headers: { [key: string]: string | string[] | undefined } = {};
   const res: Partial<Response> = {};
-  res.setHeader = jest.fn().mockReturnValue(res as Response);
+  res.setHeader = jest.fn((name: string, value: string | string[]) => {
+    headers[name.toLowerCase()] = value;
+    return res as Response;
+  });
+  res.getHeader = jest.fn((name: string) => headers[name.toLowerCase()]);
+  res.removeHeader = jest.fn((name: string) => {
+    delete headers[name.toLowerCase()];
+  });
   res.status = jest.fn().mockReturnValue(res as Response);
   res.json = jest.fn().mockReturnValue(res as Response);
   return res as Response;