mastodon/spec/services/process_mentions_service_spec.rb

require 'rails_helper'

RSpec.describe ProcessMentionsService do
  let(:account) { Fabricate(:account, username: 'alice') }
  let(:status)  { Fabricate(:status, account: account, text: "Hello @#{remote_user.acct}") }

  context 'OStatus' do
    let(:remote_user) { Fabricate(:account, username: 'remote_user', protocol: :ostatus, domain: 'example.com', salmon_url: 'http://salmon.example.com') }

    subject { ProcessMentionsService.new }

    before do
      stub_request(:post, remote_user.salmon_url)
      subject.call(status)
    end

    it 'creates a mention' do
      expect(remote_user.mentions.where(status: status).count).to eq 1
    end

    it 'posts to remote user\'s Salmon end point' do
      expect(a_request(:post, remote_user.salmon_url)).to have_been_made.once
    end
  end

  context 'ActivityPub' do
    let(:remote_user) { Fabricate(:account, username: 'remote_user', protocol: :activitypub, domain: 'example.com', inbox_url: 'http://example.com/inbox') }

    subject { ProcessMentionsService.new }

    before do
      stub_request(:post, remote_user.inbox_url)
      subject.call(status)
    end

    it 'creates a mention' do
      expect(remote_user.mentions.where(status: status).count).to eq 1
    end

    it 'sends activity to the inbox' do
      expect(a_request(:post, remote_user.inbox_url)).to have_been_made.once
    end
  end
end