list_gems_with_test_files.rb

# Print gems that contains `test_files` in gemspec with disk consumed order.
#
# Usage:
#   bundle install --path /path/to/somewhere
#   cd /path/to/somewhere/ruby/VERSION/gems
#   ruby THIS_SCRIPT.rb
#   
# Pro tip: The following links are useful when you open a PR to remove test_files.
#          * https://github.com/rubygems/guides/issues/90
#          * https://github.com/rubygems/bundler/pull/3207

files = `grep test_files */*.gemspec`.split("\n").map { _1[/([^:]+):/, 1] }.uniq

du = `du * --summarize --bytes | sort -n`.split("\n").map { _1[/([^\s]+)$/, 1] }.reverse

pp files.sort_by { |f| du.find_index { |du_item| f.include? du_item } }