Using the HtmlReport from Minitest::Reporters

Gemfile

# frozen_string_literal: true

source "https://rubygems.org"

git_source(:github) {|repo_name| "https://github.com/#{repo_name}" }

gem 'rake'
gem 'minitest'
gem 'minitest-reporters'

Rakefile

require "rake/testtask"

Rake::TestTask.new(:test) do |t|
  t.libs = %w(lib test)
  t.pattern = 'test/**/*_test.rb'
end

task :default => :test

reporter_test.rb

require 'test_helper'

class ReporterTest < Minitest::Test
  def test_a_thing
    assert_equal(1, 1)
  end
end

test_helper.rb

require 'minitest/autorun'
require 'minitest/reporters'

Minitest::Reporters.use! [Minitest::Reporters::HtmlReporter.new(:color => true)]