run failing tests from a test/unit output (eg from rake test:units > units.txt)

run_failing.rb

require "active_support/inflector"

TESTDEF_REGEX   = %r|^([a-z_]+)\(([a-zA-Z]+)\)|

test_methods = []
test_files = []

arg = ARGV.shift
if match = arg.strip.match(TESTDEF_REGEX)
  test_methods << match[1]
  test_files = Dir.glob("test/**/#{match[2].underscore}.rb").map {|f| f[0..-4]}
else
  test_method = nil
  IO.readlines(arg).each do |line|
    if match = line.match(TESTDEF_REGEX)
      test_methods << test_method = match[1]
    elsif test_method && match = line.match(%r|^[ \[]+/(.*)\.rb:[0-9]+:in `#{test_method}'|)
      test_files << match[1]
      test_method = nil
    end
  end
  test_files.uniq!
end

puts "running #{test_methods.size} tests in #{test_files.size} files"

ARGV << "-n"
ARGV << "/#{test_methods.join("|")}/"

test_files.each do |test_file|
  require test_file
end