Find Homebrew Formulas that are missing tests!

missing_tests.rb

#! /usr/bin/env ruby
# Find Homebrew formulas that are missing tests!
# Usage: run from checked out Homebrew repository root
#   $ git clone git@github.com:Homebrew/homebrew.git && cd homebrew
#   $ curl https://gist.githubusercontent.com/tedpennings/9148810/raw/ > missing_tests.rb
#   $ chmod +x missing_tests.rb
#   $ ./missing_tests.rb

min_commits = 25

def lacks_test?(path_to_formula)
  File.readable?(path_to_formula) && !file_contains_test?(File.read(path_to_formula))
end

def file_contains_test?(contents)
  contents.include?('def test') || contents.include?('test do')
end

def formulas_with_commits
  results = {}
  cmd = `git rev-list --objects --all | awk '$2' | sort -k2 | uniq -cf1 | sort -rn | grep Library/Formula/`
  cmd.split("\n").map(&:strip).each do |line|
    s = line.split(' ')
    formula, commits = s.last, s.first.to_i
    results[formula]= commits
  end
  results
end

formulas_with_commits.each_pair do |formula, commits|
  break if commits < min_commits
  puts "#{formula} with #{commits} lacks tests!" if lacks_test?(formula)
end