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)
)

BetterJUnit is a Minitest reporter that aggregates all test suites into a single JUnit XML file.

The built-in Minitest::Reporters::JUnitReporter writes one XML file per test class (e.g. TEST-CalculatorTest.xml, TEST-StringTest.xml, ...). Most CI test-result consumers — GitHub Actions test annotators, Buildkite test analytics, CircleCI insights, etc. — expect a single combined artefact. BetterJUnit emits exactly that: one <testsuites> document containing every <testsuite>, with the same field set as the upstream reporter (so it stays interoperable with every standard JUnit consumer).

In your test/test_helper.rb:

require 'minitest/reporters'
require 'better_junit'

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

The combined report is written to test/reports/junit.xml by default.

MinitestPlus::BetterJUnit.new(
  path: 'build/reports/junit.xml',  # Output file path (default: 'test/reports/junit.xml')
  base_path: Dir.pwd,               # Base for relative file paths in XML (default: Dir.pwd)
  include_timestamp: true           # Add ISO8601 timestamp per suite (default: false)
)

The path option accepts any path — nested directories are created automatically:

MinitestPlus::BetterJUnit.new(path: 'out/deeply/nested/results/my-custom-junit.xml')

<?xml version="1.0" encoding="UTF-8"?>
<testsuites>
  <testsuite name="CalculatorTest" filepath="test/calculator_test.rb" skipped="0" failures="0" errors="0" tests="2" assertions="2" time="0.000021">
    <testcase name="test_addition" lineno="6" classname="CalculatorTest" assertions="1" time="0.000018" file="test/calculator_test.rb"/>
    <testcase name="test_subtraction" lineno="10" classname="CalculatorTest" assertions="1" time="0.000003" file="test/calculator_test.rb"/>
  </testsuite>
  <testsuite name="StringTest" filepath="test/string_test.rb" skipped="0" failures="0" errors="0" tests="2" assertions="2" time="0.000010">
    <testcase name="test_reverse" lineno="10" classname="StringTest" assertions="1" time="0.000007" file="test/string_test.rb"/>
    <testcase name="test_upcase" lineno="6" classname="StringTest" assertions="1" time="0.000003" file="test/string_test.rb"/>
  </testsuite>
</testsuites>

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