psf-memo/test/unit/memo-post.test.js

/*
  Unit tests for the Memo post behavior slice (src/services/memo-post.js).

  These tests express the observable behavior described by
  specs/post-memo.feature:
    - a valid memo broadcasts an OP_RETURN transaction carrying the Memo post
      prefix (0x6d02) and the message text, and the feed reflects the new post.
    - an empty memo is rejected with a validation error and nothing is broadcast.
    - an over-long memo is rejected with a length error and nothing is broadcast.
*/

'use strict'

const test = require('node:test')
const assert = require('node:assert/strict')

const MemoPost = require('../../src/services/memo-post')
const { fakeWallet } = require('../helpers/fake-wallet')
const { registerMemoActionTests } = require('./memo-action-helpers')

// A fake feed that records posts added to the recent posts feed.
function fakeFeed () {
  const posts = []
  return { posts, addPost: (p) => posts.push(p) }
}

registerMemoActionTests({
  Action: MemoPost,
  method: 'post',
  MAX: 217,
  lengthCode: 'memo_length',
  validationCode: 'memo_validation',
  label: 'posting a memo',
  storeKey: 'feed',
  storeFactory: fakeFeed,
  assertStoreEmpty: (feed) => assert.equal(feed.posts.length, 0)
})

test('MEMO_POST_PREFIX is the Memo post action 0x6d02', () => {
  assert.equal(MemoPost.MEMO_POST_PREFIX, '6d02')
})

test('posting a valid memo broadcasts an OP_RETURN with the Memo post prefix and message', async () => {
  const wallet = fakeWallet()
  const feed = fakeFeed()
  const memoPost = new MemoPost({ wallet, feed })

  const txid = await memoPost.post('hello memo')

  assert.equal(txid, 'fake-txid')
  assert.equal(wallet.broadcasts.length, 1)
  const b = wallet.broadcasts[0]
  assert.equal(b.prefix, '6d02')
  assert.equal(b.msg, 'hello memo')

  // The feed reflects the new post from this address with this text.
  assert.equal(feed.posts.length, 1)
  assert.equal(feed.posts[0].text, 'hello memo')
  assert.equal(feed.posts[0].address, wallet.walletInfo.cashAddress)
})

test('posting without a wallet reports a missing-wallet error', async () => {
  const memoPost = new MemoPost({})
  await assert.rejects(
    memoPost.post('hello memo'),
    (err) => /wallet/i.test(err.message)
  )
})