Make unit tests great again – Integrate Jasmine into Rails

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Jasmine is a framework to write tests for the Javascript code in the Behaviour Driven Development (BDD) style. In this article, you will learn how to integrate Jasmine into your existing rails application and how to write clean and beautiful unit tests. Let us make tests great again!


Install Jasmine

To make Jasmine available to your Rails app, you just have to place the jasmine-gem (link) in your Gemfile. That will do the magic. Just make sure you have it under Development and Test group in the Gemfile as follows:

Then run this to install the gem:

After all the gems are installed, run this code to generate necessary files for Jasmine to run:

This will create the jasmine helper file and the yml file where you configure how it should run the tests.

Run tests

You can use Jasmine right after it’s installed. It can be run in several ways, the most important ones being,

  • In your browser
  • Continuous Integration Mode (CI)
  • The CI mode is usually used when you have to integrate it into your build system.

    Browser Mode

    You have to start the Jasmine server to run it in a browser. This server runs all the tests and serves the results to a webpage. …

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    application_record.rb available since rails 5

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    Those who have been starting with Rails 5, must have noticed the new application_record.rb file present in your model folder. And all new models seems to be inheriting the application_record.rb instead of the ActiveRecord::Base. This is done so that we don’t pollute the ActiveRecord::Base namespace with our own extensions.  Before when we require something, say an extension to the ActiveRecord itself we used to have it included using the following code.

    Now the problem with this approach is that when we use rails engines this NewFeature gets added in there as well, and it could end up doing things that we didn’t expect.

    With the new application_record.rb, which would be inherited by all the models, we need to include the new module at the ApplicationRecord and it would be available as the new feature of ActiveRecord. Every new engine generated using rails plugin new would also be having their own application_reocord.rb

    One more point to note is that we can place application wide hooks in this file. So if you were to do

    it would be triggered when a new record is created in any of the models of the rails application.

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