test_helper.rb

## in test/test_helper.rb

class Test::Unit::TestCase
  alias unlogged_run run
  def run(result, &block)
    RAILS_DEFAULT_LOGGER.debug "RUNNING #{self.class} #{@method_name}"
    start_time = Time.now
    unlogged_run result, &block
    time = Time.now - start_time
    RAILS_DEFAULT_LOGGER.debug "TIME;#{self.class}#{@method_name.gsub(/,/, '')};#{time}"
  end
end if ENV['PROFILE_LOG']

## in shell config
alias slow_tests="truncate log/test.log && PROFILE_LOG=1 rake && grep TIME log/test.log | cut -d';' -f2- | sort -t';' -n -k2 -r | head -n 20"