test(desktop): update topic tree utils test case

src/views/viewer/TopicTree.vue

@@ -40,7 +40,6 @@ export default class TopicTree extends Vue {
       packet,
       connectionInfo,
     })
-    console.log(JSON.stringify(this.data, null, 2))
   }
 
   created() {

tests/unit/utils/topicTree.spec.ts

@@ -5,6 +5,7 @@ import {
   findSubTopics,
   findFullTopicPath,
   getAllIDs,
+  isPayloadEmpty,
 } from '@/utils/topicTree'
 import { IPublishPacket } from 'mqtt-packet'
 
@@ -405,4 +406,13 @@ describe('Topic Tree Functions', () => {
     const fullPath = findFullTopicPath(tree, 'non-existent')
     expect(fullPath).to.be.null
   })
+
+  it('should correctly identify empty payloads', () => {
+    expect(isPayloadEmpty(null)).to.be.true
+    expect(isPayloadEmpty(undefined)).to.be.true
+    expect(isPayloadEmpty('')).to.be.false
+    expect(isPayloadEmpty('non-empty')).to.be.false
+    expect(isPayloadEmpty(Buffer.from(''))).to.be.false
+    expect(isPayloadEmpty(Buffer.from('non-empty'))).to.be.false
+  })
 })