Plugin to generate sonar metrics for ruby
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SonarQube Ruby Plugin Build Status Coverage Status Codacy Badge


This plugin enables publishing static and dynamic analysis reports of Ruby projects onto SonarQube 5.6.3+

The plugin currently supports the following services:

  • Lines of code, Number of classes, Comment precentage
  • Code Complexity (file complexity)
  • Code Smells
  • Code Coverage (line coverage)
  • Coding Style Violations

It relies on standardized external tools: SimpleCov, SimpleCov-RCov and Metric_Fu in order to make the analysis and report the metrics which are then in turn published to SonarQube.


  1. Run mvn install to produce the target/sonar-ruby-plugin-VERSION.jar plugin file
  2. Place the plugin file into the SONARQUBE_HOME/extensions/plugins directory


Make sure the property sonar.language is set to ruby: sonar.language=ruby in the file as well as the sonar.exclusions and sonar.inclusions patterns

Code Coverage

In order for the plugin to report on code coverage, the ruby project needs to be using simplecov-rcov to generate a coverage report when you run your tests/specs, please see the gem's homepage here for installation and usage instructions.
Generally, you will need to add to your test suite a snippet similiar to:

# Run simplecov code coverage for sonar integration  
if( ENV['COVERAGE'] == 'on' )  

  # Include requirements  
  require 'simplecov'  
  require 'simplecov-rcov'  

  # Set formatter as rcov to support third-party plugin  
  SimpleCov.formatters = SimpleCov::Formatter::RcovFormatter  

  SimpleCov.start 'rails' do  
	add_group 'API', 'app/controllers/api'  

Important: Do not change the output directory for the simplecov-rcov report, leave it as default, or code coverage will not be reported.

Code Complexity

In order for the plugin to report on code complexity, metric_fu needs to be ran against the ruby project, which will generate a metric report. Please see the gem's homepage for installation and usage instructions.

Important: We recommend using metric_fu by running metric_fu -r --no-flog --no-flay --no-roodi --no-open which would analyze and report all of the metrics supported by the plugin. Such as Saikuro/Cane coverage, Cane issues, Hostpots, Code smells and more..

Multiple Testing Suites

If you are using multiple testing frameworks or maintaining different testing logical suits using the command_name functionality in SimpleCov such as:

  "Unit Tests": {
    "coverage": {
      "a.rb": [
    "timestamp": 1489921705
  "test:special_name": {
    "coverage": {
      "b.rb": [
    "timestamp": 1489921744

Use the sonar.ruby.coverage.testSuites property to set the correct tests aggregation method:

  • null or "all": all suites will be published
  • comma delimited test suite names: selected suits will be published

Future Plans

  • Code Duplication
  • Structural Analysis
  • Code Debt

Giving Credit

The github project pica/ruby-sonar-plugin, is where the ruby-sonar-plugin started, bringing basic project statistics.
It was then carried forward by GoDaddy-Hosting/ruby-sonar-plugin, bringing code coverage and code complexity as well as updating it to SonarQube 4.5.5 LTS.
We took this project as a reference point, updated to the latest SonarQube LTS v5.6.3, fixed broken sensor bugs, added code smells, added unit tests and refactored a large portion of the code base. Basically adding new functionality and cleaning the house.

We referenced the Java Sonar Plugin and the Python Sonar Plugin for the code coverage sensor and the static analysis reporting methodology.

Tool Versions

This plugin has been tested with the following dependency versions:

  • SonarQube 5.6.3 LTS
  • SonarQube Runner 2.7 (or newer)
  • metric_fu gem version 4.12.0 (latest at time of edit)
  • simplecov 0.12.0
  • simplecov-rcov 0.2.3