Install the gem and add to the application's Gemfile by executing:

$ bundle add test-unit-ruby-core

If bundler is not being used to manage dependencies, install the gem by executing:

$ gem install test-unit-ruby-core

Use core_assertions with test/unit as follows:

require "test/unit"
require "core_assertions"

Test::Unit::TestCase.include Test::Unit::CoreAssertions

Bug reports and pull requests are welcome on GitHub at https://github.com/ruby/test-unit-ruby-core.

The gem is available as open source under the terms of the Ruby's License