Fix mock Redis server to handle proper Redis handshake protocol

Author: bobymicroby

src/app.test.ts

@@ -20,12 +20,37 @@ describe('Redis Proxy API', () => {
       port: targetPort,
       socket: {
         data(socket, data) {
-          // Simple Redis protocol responses with storage
+          // Handle Redis protocol commands properly
           const command = data.toString();
+          console.log('Mock Redis received:', command.replace(/\r\n/g, '\\r\\n'));
 
-          if (command.includes('FOO')) {
+          // Handle HELLO command (Redis 6+ handshake)
+          if (command.includes('HELLO')) {
+            // Return Redis server info for HELLO command
+            socket.write('*7\r\n$6\r\nserver\r\n$5\r\nredis\r\n$7\r\nversion\r\n$5\r\n7.2.0\r\n$5\r\nproto\r\n:3\r\n$2\r\nid\r\n:1\r\n');
+          }
+          // Handle AUTH command
+          else if (command.includes('AUTH')) {
+            socket.write('+OK\r\n');
+          }
+          // Handle PING command
+          else if (command.includes('PING')) {
+            socket.write('+PONG\r\n');
+          }
+          // Handle FOO command (our test command)
+          else if (command.includes('FOO')) {
             socket.write('+BAR\r\n');
-          } else {
+          }
+          // Handle SELECT command (database selection)
+          else if (command.includes('SELECT')) {
+            socket.write('+OK\r\n');
+          }
+          // Handle INFO command
+          else if (command.includes('INFO')) {
+            socket.write('$23\r\n# Server\r\nredis_version:7.2.0\r\n');
+          }
+          // Default response for any other command
+          else {
             socket.write('+OK\r\n');
           }
         },