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A/B testing (or split testing) is a really common way of testing changes in your app to determine which works best for your users.
In this episode, we add tests for our Basecamp 3 style urls that we built using a Rack middleware
Test Driven Development, or TDD, is a pretty simple process that allows you to write your code in conjunction with tests to ensure a high level of confidence and code coverage.
You can use Fixtures in Rails to create sample database records for your tests to run against. They're easy to setup and extremely quick.
Learn how to write integration tests in Rails to test controllers and actions
WebMock is a fantastic way to stub out and mock your HTTP requests. It will actually throw an exception in your test suite when an HTTP request is made so that you know when you're hitting an external API that you haven't stubbed out correctly.
Testing integrations with external APIs in your Rails app can be hard. You don't know what requests are being made (or even the responses), so how can you properly mock them out? VCR to the rescue.
Rails provides several really useful test helpers for ActionMailer so we can quickly iterate on our design, test that our code queues up the right emails, and make sure our emails contain the right content.
Testing ActionCable authentication with Devise is pretty easy, especially when we build our own helpers to stub out Warden
Test stubs are very handy when you want to mock out the response to a method call. This allows your tests to be more reliable and skip long running or unnecessary method calls.
Mocks are a handy tool for writing tests in Ruby. You can use them to fake an object and verify that the correct methods were called against it. Perfect for testing a method that integrates closely with another class or module.
Learn how to test ActiveStorage file uploads and create fixtures with ActiveStorage attachments
Testing file uploads can be tricky, but Shrine makes both file uploading and testing a lot easier than you might expect.
Contribute to Rails by discovering something you could improve and learning how to add features to Rails
ActsAsTenant needed some maintenance so we're going to walk through the steps of refactoring the gem and Rspec test suite
Testing a gem or your Rails app against multiple Ruby and Rails versions is super useful, but we also take it a step further and test our gem against several different databases too
I found a bug in the Kredis gem the other day and wanted to walk you through my thought process on debugging and using TDD to fix the bug for the future.
Learn how to use system tests for file uploads with file input fields and drag & drop with Uppy and Dropzone
Rails apps and Rubygems might need to support multiple databases. We can use the DATABASE_URL environment variable to quickly swap out the database that Rails uses in CI, local testing, and more.
Testing your Meilisearch integration in Rails can be a little tricky. This episode, we'll talk through how to setup Meilisearch in your test suite to index fixtures and more.
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