Want to speed up your test suite? Reduce the number of objects persisted to the database. With Factory Bot, this is really easy; instead of using build or create to instantiate your models with data, use build_stubbed! build_stubbed is the younger, more hip sibling to build; it instantiates and assigns attributes just like build, but that’s where the similarities end. It makes objects look like th

When building an application that sends SMS, we like to use an external service such as Twilio to handle the actual sending of the messages. When unit testing parts of code that interact with SMS, you can simply stub out the actual sending of SMS to keep your test isolated. But what about feature specs? Writing feature specs Take the following two user stories: When I make a purchase, I want to re

The Rails fresh_when method is a powerful tool for conditionally caching resources via HTTP. However there are some pitfalls. For one, fresh_when only supports the default render flow in a controller; if a client’s cache is not fresh, it will just render the related view. We cannot utilize things like render json:. Fortunately, Rails provides us with more tools to work with HTTP conditional cachin

We have a race condition between click_link and reload_page. Sometimes the AJAX call will go through before Capybara reloads the page, and sometimes it won’t. This kind of nondeterministic test can be very difficult to debug, so I added a little helper. Capybara’s Little Helper Here’s the helper, via Coderwall: # spec/support/wait_for_ajax.rb module WaitForAjax def wait_for_ajax Timeout.timeout(Ca

New Callback Syntax Callbacks have been revamped to work well in conjunction with custom strategies. Instead of declaring callbacks like this: FactoryBot.define do factory :user do factory :user_with_posts do after(:create) {|instance| create_list(:post, 5, user: instance) } end end end

Back in January, Sandi Metz introduced her rules for developers in a Ruby Rogues podcast episode episode. Around the time Sandi’s rules were published, the team I am on was starting a new project. This post details the experience of that team applying Sandi’s rules to the new application. The rules _There are four rules._ Here are the rules: Classes can be no longer than one hundred lines of code.