test: fix prune tests

Author: kbkk

src/commands/prune.spec.ts

@@ -48,7 +48,7 @@ describe('prune', () => {
 
     await expect(prune.execute((msg as unknown) as Discord.Message, ['2'])).to.be.fulfilled;
     await expect(msg.channel.fetchMessages).to.have.been.calledOnceWithExactly({ limit: 2 });
-    await expect(messagesCollectionMock.clear).to.have.been.calledOnce;
+    await expect(msg.channel.bulkDelete).to.have.been.calledOnceWithExactly(messagesCollectionMock);
   });
 
   it('should delete itself', async () => {

test/mocks.ts

@@ -39,6 +39,7 @@ export const getMessageMock = (name: string, params: any = {}) => {
   const mockMessage = {
     ...params,
     channel: {
+      bulkDelete: Sinon.stub(),
       send: Sinon.stub(),
       fetchMessages: Sinon.stub(),
       type: '',