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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    Behind the scenes of hash table performance in ruby 2.4

    Behind the scenes of hash table performance in ruby 2.4


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    Ruby 2.4 got released this Christmas with a lot of exciting features. One of the most underrated features in ruby 2.4 is hash table improvements. Before going into details about implementation, let’s first check the benchmark to know how this change gonna affect your ruby application.

    Some benchmarks are:

    Getting keys and values of a hash

    Output

    Ruby 2.3.3

     

    ruby 2.4.0

    Yeah, the above two operations executed ~ 3 times faster on my laptop. Though these numbers can vary with your machine and processor, the performance improvements will be significant on all modern processors. Not all operations became 3 times faster , average perfomence improvement is more than 50%

    If you are a ruby developer and excited to know what are the new features in ruby 2.4, then this feature gonna make your application faster and you don’t have to change anything in the code for that. Because these changes are backward compatible. If you are curious to know what happened behind the scenes of this performance boost, then continue reading.

    Hash Table

    In computing, hash table (hash map) is a data structure that is used to implement an associative array, a structure that can map keys to values. Hash table …

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    New binding.irb introduced in ruby 2.4


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    Ruby 2.4 will have the feature to introduce a REPL session, using IRB, in between your code execution for better debugging. IRB, which stands for Interactive Ruby, is the standard REPL which is bundled along with ruby. Pry is a popular alternative for IRB, which has many developer-friendly features like tab compilation and syntax highlighting. One of the most heavily used features of pry is the ability to introduce a REPL session in between your code execution for better debugging. Instead of using p or puts to print the result and various variables, this helps us try out various codes and fixes in between the code to find the right solution.

    binding.pry being used.

     

    To use binding.irb in your code, you need to require the IRB library to your code and call binding.irb where you want to introduce the REPL.

    and you will see a REPL like below.

    screen-shot-2016-11-22-at-10-47-27-am

     

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