better_coverage

better_coverage is a Minitest reporter that displays SimpleCov coverage results in Jest/Istanbul's console format with a directory tree structure.

Using better_coverage lets you see coverage in Jest's familiar table format right in your terminal. The reporter organizes files into a directory tree, shows uncovered line ranges (e.g., 5-12,18), and applies the same color coding as Jest so your Ruby coverage reports look exactly like your JavaScript ones.

Add the gem to your Gemfile:

gem 'better_coverage'

Then configure in your test/test_helper.rb:

require 'simplecov'
SimpleCov.start

require 'minitest/reporters'
require 'better_coverage'

Minitest::Reporters.use! [
  MinitestPlus::BetterCoverage.new
]

Run your tests:

bundle exec rake test

MinitestPlus::BetterCoverage.new(
  max_cols: 120,     # Terminal width (default: 80)
  skip_empty: true,  # Skip files with no lines (default: false)
  skip_full: true    # Skip 100% covered files (default: false)
)

Contributions are welcome! If you find a bug or have suggestions for improvement, please open an issue or submit a pull request.

Apache License 2.0 © 2025 Mridang Agarwalla