Collecting JavaScript code coverage with Capybara in Ruby on Rails application

• Webpacker

  57 5,309 4.1 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.

• jest

  479 43,717 9.5 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This instrumenter is already outdated, but Jest is still using it to get coverage, and we have not found any alternatives to work with Webpack directly.

• Scout Monitoring

  www.scoutapm.com featured

  Rennaisance engineers rejoice! 1 gem 5 min to app monitoring. 5-minute onboarding. No sales team. Devs in the support channels. No DevOps team required. Get the free app insights every engineer deserves with Scout Monitoring.

  

• Capybara

  21 9,978 7.9 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.

• istanbul-instrumenter-loader

  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).

• codecov-ruby

  1 71 - Ruby

  Discontinued Ruby uploader for Codecov

  

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

• nyc

  17 5,534 5.2 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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