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::CoreAssertionsBug 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