brew/Library/Homebrew/cmd/test.rb

module Homebrew extend self
  def test
    raise KegUnspecifiedError if ARGV.named.empty?

    ARGV.formulae.each do |f|
      # Cannot test uninstalled formulae
      unless f.installed?
        puts "#{f.name} not installed"
        next
      end

      # Cannot test formulae without a test method
      unless f.respond_to? :test
        puts "#{f.name} defines no test"
        next
      end

      puts "Testing #{f.name}"
      begin
        # tests can also return false to indicate failure
        puts "#{f.name}: failed" if f.test == false
      rescue
        puts "#{f.name}: failed"
      end
    end
  end
end