company_market_updates_service_spec.rb

describe CompanyMarketUpdatesService, type: :service do
  let(:notification_job) { object_spy(NotificationJob) }
  let(:service) { described_class.new(notification_job: notification_job)
  let(:apple) { Company.create!(name: 'Apple', stock_symbol: 'APPL', stock_volume: 22000000, stock_price: 100.0, number_of_shares: 100000000) }

  it 'modifies company stockage information' do
    updated_company = service.update(stock_symbol: apple.stock_symbol, stock_volume: 23000000, stock_price: 105.0)
    expect(updated_company.stock_price).to eq(105.0)
    expect(updated_company.stock_volume).to eq(23000000)
  end

  it 'sends a notification when the stock price goes down' do
    expect(notification_job).to receive(:perform_later).with(hash_including(:message => kind_of(String))).and_return(kind_of(Company))
    service.update(stock_symbol: apple.stock_symbol, stock_volume: 24000000, stock_price: 80.0)
  end

  it 'does not send a notification when the stock price goes up' do
    service.update(stock_symbol: apple.stock_symbol, stock_volume: 25000000, stock_price: 200.0)
    expect(notification_job).not_to have_received(:perform_later).with(hash_including(:message => kind_of(String)))
  end
end