mastodon/spec/controllers/stream_entries_controller_spec.rb

require 'rails_helper'

RSpec.describe StreamEntriesController, type: :controller do
  let(:alice)  { Fabricate(:account, username: 'alice') }
  let(:status) { Fabricate(:status, account: alice) }

  describe 'GET #show' do
    it 'returns http success with HTML' do
      get :show, account_username: alice.username, id: status.stream_entry.id
      expect(response).to have_http_status(:success)
    end

    it 'returns http success with Atom' do
      get :show, account_username: alice.username, id: status.stream_entry.id, format: 'atom'
      expect(response).to have_http_status(:success)
    end
  end
end