module Maxitest::Testrbl

def changed_files
  changed_files = sh("git status -s").split("\n").map { |l| l.strip.split(/\s+/, 2)[1] }
  if changed_files.empty?
    # user wants to test last commit and not current diff
    changed_files = sh("git show --name-only").split("\n\n").last.split("\n")
  end
  # we only want test files that were added or changed (not deleted)
  changed_files.select { |f| f =~ /_(test|spec)\.rb$/ && File.exist?(f) }
end