refactor: update command tests to use require syntax and improve error handling

__tests__/commands/ping.test.js

@@ -12,7 +12,8 @@ jest.mock('discord.js', () => ({
   }),
 }));
 
-const pingCommand = require('../../commands/ping');
+const PingCommand = require('../../commands/ping').default;
+const pingCommand = new PingCommand();
 
 describe('Ping Command', () => {
   describe('Command Structure', () => {
@@ -47,7 +48,7 @@ describe('Ping Command', () => {
 
     it('should handle interaction reply failure', async () => {
       // Mock a failed reply
-      interaction.reply.mockRejectedValueOnce(new Error('Failed to reply'));
+      interaction.reply.mockRejectedValue(new Error('Failed to reply'));
 
       await expect(pingCommand.execute(interaction)).rejects.toThrow(
         'Failed to reply',