Testing Episodes - Ruby on Rails Screencast Tutorials

Learn how to write your own test helpers to build assertions. In this lesson, we're adding some test helpers to the turbo-rails gem to assert that turbo-frame tags in the response.

26m

Adding Sales to the black_friday gem

Dec 02, 2024 Pro

Calculating dates is helpful, but what if we took the black_friday gem a step further by adding sales?

Tests Without Assertions Warning in Rails 7.2

Sep 16, 2024

Rails 7.2 now warns if any test runs without assertions. It helps make tests that may raise errors more explicit and less prone to mistakes.

15m

Writing Tests for Scheduled Blog Posts

Apr 03, 2023

Our scheduled blog posts adds some complexity to our app. In this lesson, we're going to write some tests to make sure that our code does what we want it to do.

26m

How to Test OmniAuth with Rails

Testing OmniAuth integrations in your Rails app can be straightforward for basics, but there's not a lot of documentation about testing other things like OmniAuth Params. This episode, we'll test registration, login, and OmniAuth params.

16m

Testing a Meilisearch Integration with Ruby on Rails

May 02, 2022 Pro

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.

23m

Concept Application: Assert Difference Deep Dive

Apr 25, 2022

In this video, we will explore how the concepts we looked at in "Flattening Scopes in Ruby" are used in Rails by taking a look at the assert_difference method. We will walk through how the method works while taking note of where the concepts are applied.

Testing Against Multiple Databases in Rails with The DATABASE_URL Env Var

Apr 11, 2022 Pro

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.

18m

System Testing File Uploads in Rails with Uppy and Dropzone Drag & Drop

Jan 26, 2022 Pro

Learn how to use system tests for file uploads with file input fields and drag & drop with Uppy and Dropzone

15m

Using TDD To Fix A Bug In The Kredis Gem

Dec 06, 2021 Pro

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.

Contrasting Colors with YIQ and Helper Tests in Rails

Apr 23, 2021

Ever wondered how to generate contrasting colors in your Rails app? It's easy using the YIQ calculation and we can test it easily with helper tests.

14m

Testing against multiple versions of Ruby, Rails, and Databases with GitHub Actions

Nov 30, 2020 Pro

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

10m

Continuous Deployment with Rails & GitHub Actions

Nov 23, 2020

Continuous Deployment is the automation of deploying any code that gets merged into your main or release branch. We can easily set up GitHub Actions to run CI and CD for us to automate everything.

26m

How to Upgrade Old Projects: ActsAsTenant

Nov 17, 2020 Pro

ActsAsTenant needed some maintenance so we're going to walk through the steps of refactoring the gem and Rspec test suite

13m

How to Test Gem Dependencies with Appraisal

Sep 03, 2020

Appraisal lets us test our code against different versions of dependencies. This is fantastic if you're building Rubygems that must work with multiple versions of Rails or other dependencies

11m

Improving the Rails Conductor for Inbound Emails & ActionMailbox

Jul 14, 2020 Pro

Contribute to Rails by discovering something you could improve and learning how to add features to Rails

11m

Code Coverage with SimpleCov and RailsBytes

Jun 23, 2020

Add code coverage to your app using SimpleCov and RailsBytes. We'll walk through installing simplecov and creating a RailsByte to automate it for us going forward.

22m

Testing File Uploads in Rails with Shrine

Mar 23, 2020 Pro

Testing file uploads can be tricky, but Shrine makes both file uploading and testing a lot easier than you might expect.

16m

Testing ActiveStorage File Uploads and Fixtures

Feb 17, 2020 Pro

Learn how to test ActiveStorage file uploads and create fixtures with ActiveStorage attachments

How to use Mocks in Ruby tests

Jan 13, 2020 Pro

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.

Filter By

All Episodes Free Episodes Pro Episodes

Sort By

Published Date Popularity

Adding Turbo Frame Test Helpers

Jun 16, 2025 Pro