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.includeTest::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