feat: [#4] NewJobMessage does not have a jor ref

__tests__/unit/message.test.ts

@@ -1,16 +1,16 @@
+import {JobFinishedMessage, NewJobMessage} from '../../src/message'
 import {CommitHash} from '../../src/commit-hash'
-import {NewJobMessage} from '../../src/message'
 
 describe('Message', () => {
-  it('should have payload', () => {
+  it('should have a payload', () => {
     const message = new NewJobMessage('payload')
     expect(message.getPayload()).toBe('payload')
   })
 
   it('could have an optional reference (commit hash) to another job', () => {
     const hash = new CommitHash('f1a69d48a01cc130a64aeac5eaf762e4ba685de7')
 
-    const message = new NewJobMessage('payload', hash)
+    const message = new JobFinishedMessage('payload', hash)
 
     expect(message.getJobRef().equalsTo(hash)).toBe(true)
   })
@@ -26,7 +26,7 @@ describe('Message', () => {
     expect(messageWithoutJobRef.hasJobRef()).toBe(false)
 
     const hash = new CommitHash('f1a69d48a01cc130a64aeac5eaf762e4ba685de7')
-    const messageWithJobRef = new NewJobMessage('payload', hash)
+    const messageWithJobRef = new JobFinishedMessage('payload', hash)
     expect(messageWithJobRef.hasJobRef()).toBe(true)
   })
 })

src/message.ts

@@ -26,6 +26,10 @@ export abstract class Message {
 }
 
 export class NewJobMessage extends Message {
+  constructor(payload: string) {
+    super(payload, nullCommitHash())
+  }
+
   getKey(): MessageKey {
     return new MessageKey('🈺')
   }