Collecting JavaScript code coverage with Capybara in Ruby on Rails application

1. Webpacker

   1 57 5,296 2.9 Ruby

   Use Webpack to manage app-like JavaScript modules in Rails

   

   For example, there is a Ruby on Rails application that uses Webpacker and has JavaScript files that are covered by the system tests. Capybara is used as the system testing tool.

2. Stream

   getstream.io featured

   Stream - Scalable APIs for Chat, Feeds, Moderation, & Video. Stream helps developers build engaging apps that scale to millions with performant and flexible Chat, Feeds, Moderation, and Video APIs and SDKs powered by a global edge network and enterprise-grade infrastructure.

   

3. jest

   2 537 45,219 9.4 TypeScript

   Delightful JavaScript Testing.

   

   This instrumenter is already outdated, but Jest is still using it to get coverage, and we have not found any alternatives to work with Webpack directly.

4. Capybara

   3 22 10,133 6.3 Ruby

   Acceptance test framework for web applications

   

   For example, there is a Ruby on Rails application that uses Webpacker and has JavaScript files that are covered by the system tests. Capybara is used as the system testing tool.

5. istanbul-instrumenter-loader

   4 1 273 - JavaScript

   Discontinued Istanbul Instrumenter Loader

   

   For getting coverage of the JavaScript code, we use Istanbul Instrumenter Loader. It needs to be added as a dev dependency with the package manager (Link to installation).

6. codecov-ruby

   5 1 71 - Ruby

   Discontinued Ruby uploader for Codecov

   

   For collecting the coverage results we will use Codecov. It has several arguments in his favor:

7. nyc

   6 18 5,725 5.6 JavaScript

   the Istanbul command line interface

   

   At the next stage, they are merged into one JSON file. For this purpose, we use nyc (Istanbul’s command line interface).

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