Use buildEvent function in more places

nip18.test.ts

@@ -1,4 +1,5 @@
 import {nip18, finishEvent, getPublicKey, Kind} from '.'
+import { buildEvent } from './test-helpers'
 
 const relayUrl = 'https://relay.example.com'
 
@@ -95,15 +96,10 @@ describe('finishRepostEvent + getRepostedEventPointer + getRepostedEvent', () =>
 
 describe('getRepostedEventPointer', () => {
   it('should parse an event with only an `e` tag', () => {
-    const event = {
+    const event = buildEvent({
       kind: Kind.Repost,
       tags: [['e', 'reposted event id', relayUrl]],
-      content: '',
+    })
-      created_at: 0,
-      pubkey: '',
-      id: '',
-      sig: '',
-    }
 
     const repostedEventPointer = nip18.getRepostedEventPointer(event)
 

nip26.test.ts

@@ -1,4 +1,5 @@
 import {nip26, getPublicKey, generatePrivateKey} from '.'
+import { buildEvent } from './test-helpers'
 
 test('parse good delegation from NIP', async () => {
   expect(
@@ -94,14 +95,10 @@ test('create and verify delegation', async () => {
   expect(delegation).toHaveProperty('to', pk2)
   expect(delegation).toHaveProperty('cond', 'kind=1')
 
-  let event = {
+  let event = buildEvent({
     kind: 1,
     tags: [['delegation', delegation.from, delegation.cond, delegation.sig]],
     pubkey: pk2,
-    content: '',
+  })
-    created_at: 0,
-    id: '',
-    sig: '',
-  }
   expect(nip26.getDelegator(event)).toEqual(pk1)
 })

references.test.ts

@@ -1,10 +1,8 @@
 import {parseReferences} from '.'
+import { buildEvent } from './test-helpers'
 
 test('parse mentions', () => {
-  let evt = {
+  let evt = buildEvent({
-    kind: 1,
-    id: '',
-    pubkey: '',
     tags: [
       [
         'p',
@@ -25,9 +23,7 @@ test('parse mentions', () => {
     ],
     content:
       'hello #[0], have you seen #[2]? it was made by nostr:nprofile1qqsvc6ulagpn7kwrcwdqgp797xl7usumqa6s3kgcelwq6m75x8fe8yc5usxdg on nostr:nevent1qqsvc6ulagpn7kwrcwdqgp797xl7usumqa6s3kgcelwq6m75x8fe8ychxp5v4! broken #[3]',
-    created_at: 0,
+  })
-    sig: '',
-  }
 
   expect(parseReferences(evt)).toEqual([
     {