Rails why test

Did you have a look at the official Rails Guides about Testing? And finally this is not how you test controllers at all. Ok, thanks. Well, I've got to learn somehow. Sorry to ask Add a comment. Active Oldest Votes. Improve this answer. Hope it will help. Roman Alekseiev Roman Alekseiev 1, 15 15 silver badges 21 21 bronze badges. There is a lot thats just wrong about this answer. Rails has always officially endorsed first test unit and then minitest. RSpec is generic BDD framework and is not "written on Ruby special for this purpose" unless you just mean testing in general.

Don't get me wrong - I love RSpec. But in its not really that correct to point to RSpec as "the way to write RoR tests". I think it's still the best intro to rails testing - rspec. The question is by a newcomer, so he probably wants something simple before getting into the depth of non-rails ruby.

Sign up or log in Sign up using Google. Sign up using Facebook. Thus, by adding system tests, we increase the maintenance costs for development and CI environments and introduce potential points of failures or instability: due to the complex setup, flakiness is the most common problem with end-to-end testing. And most of this flakiness comes from communication with a browser. Although by introducing system tests in 5. By default, Rails assumes that you will be running system tests with Selenium.

Selenium is a battle-proven software for web browsers automation. It aims to provide a universal API for all browsers as well as the most realistic experience.

Only real humans made of meat and bones could do better in terms of emulating user-browser interactions. Several years ago, this situation changed with the introduction of CDP protocol for Chrome. Using CDP, you can manipulate browser sessions directly, no need for intermediate abstraction layers and tools. A lot of projects leveraging CDP appeared since then, including the most well-known one— Puppeteer , a browser automation library for Node.

What about the Ruby world? Ferrum , a CDP library for Ruby, although being a pretty young one, provides a comparable to Puppeteer experience. Setting up system tests became bloody simple all you need is love Chrome , and the execution is so fast that after migrating from Selenium some of my tests failed: they lacked proper async expectations and passed in Selenium only because it was much slower.

It aims to demonstrate how to use the just released AnyCable 1. The project uses RSpec and its system testing wrapper. We use a separate helper file and a support folder for system tests to avoid all the excess configuration in the case when we only need to run a single unit test. This file contains configuration for Capybara framework:. The Capybara. This patch tracks the name of the last session used.

This file contains some patches to Rails system tests internals as well as some general configuration see code comments for explanations :. Check out this PR on other techniques for detecting whether we need to precompile assets or not. Why precompiling assets manually if Rails can do that for you automatically? The problem is that Rails precompiles assets lazily i.

Another thing I want to pay attention to is the ability to use a Webpack dev server for system tests. A good CI setup raises the bar of software quality considerably. You can add your project to Semaphore CI for free in a few minutes. Semaphore has full support for Ruby and Ruby on Rails. We can remove it easily:. For a simple example like ours, having everything in one job is not the end of the world. This job only responsibility is to download the Gems and store the in the cache:.

Our pipeline is shaping up nicely. Now you can add more tests in the test block without increasing the overall execution time, as all tests can run in parallel. One great alternative for deployment is Docker. Docker creates portable containers that make it easy to run your application anywhere with minimal setup.

Semaphore can build and test the Docker images in seconds. To learn more, head over to the Docker overview page and be sure to not miss the Dockerizing Ruby tutorial. In this tutorial, we saw how we can approach testing models in Ruby on Rails. As you can see, model specs are very different from the kind of specs we would write for a regular Ruby object.

Aside from the DSL that Rails provide for the model, RSpec also provides us with model specs, which allow us to properly unit test our models. We saw how we can tackle issues in the BDD way, by using specs and test-driven development. What is your preferred way to test models? Do you use BDD in your everyday work? When testing, do you use the red-green-refactor cycle? Feel free to leave a comment below.

Would you like to learn how to build sustainable Rails apps and ship more often? Learn more and download a free copy. Have a comment? Join the discussion on the forum. Search for:. How to test models in Rails? How to test business logic with Rspec? How to use Continuous Integration to automate testing? What is Behaviour-driven Development? Introducing our Model When we think of Rails models, we usually think of reflecting the problem domain for which we are providing a solution.

If we run this spec now, we should see it failing. Finished in 0. Refactoring and Getting back to Red The RSpec testing framework provides some quite useful utilities. To add the shoulda gem, edit Gemfile and add the package inside the development or test group: group :development, :test do. Adding Business Behaviour If you think about real-life auctions, you will immediately think about the auctioneer chants.

Continuous Integration Continuous Integration CI is a software development practice in which the code is continually tested on an automated CI Pipeline. Repository : A GitHub repository follow the create a repo instructions. Git : install Git to handle the code.