Calculate statement coverage of the test suite

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• Code coverage metrics measure how much of the code in a software project is executed by a test suite.
• Statement coverage tracks which code statements were (and were not) executed by a test suite.

Task

• Add, configure, and run the SimpleCov gem for calculating statement coverage of the test suite.

Steps

• Add and install gem:
  • Gemfile - configuration file to edit.
  • bundle install - command to install gem.
• Add configuration code:
  • test/test_helper.rb - code file to edit.
• Calculate statement coverage:
  • rails test -v - command to run tests and generate coverage report.
• Inspect the statement coverage results:
  • coverage/index.html - coverage report to view in web browser.
• Make Git ignore the coverage folder:
  • echo coverage >> .gitignore - command to add coverage folder to gitignore file.

Reference Code

• Gemfile code:

# Test coverage metrics
gem 'simplecov', require: false, group: :test

• Test helper configuration code:

require 'simplecov'
SimpleCov.start('rails')

• Don’t forget to comment out the parallelize call:

  # parallelize(workers: :number_of_processors)

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