it's not pretty, but it's mine

gistfile1.rb

%w[autotest/fsevent autotest/timestamp redgreen/autotest autotest/growl test_notifier/runner/autotest].each do |lib|
  begin
    require lib
  rescue LoadError => e
    warn "Couldn't load #{lib}: #{e}"
  end
end

TestNotifier.default_notifier = :growl if defined? TestNotifier

if defined? Autotest::Growl
  Autotest::Growl::clear_terminal = false

  # ~/Library/Autotest should inlcude failed.png, passed.png and pending.png
  growl_image_dir = File.join(ENV["HOME"], "Library", "Autotest")
  Autotest::Growl::image_dir = growl_image_dir if File.directory? growl_image_dir
end

# skip some paths
Autotest.add_hook :initialize do |autotest|
  %w[.git .svn .hg .swp .DS_Store ._* tmp db log tmp vendor rerun.txt Gemfile.lock].each do |exception|
    autotest.add_exception(exception)
  end

  # add mappings for files test files that end in 'test'
  autotest.add_mapping %r%^(test)/.*_test.rb$% do |filename, _|
    filename
  end

  autotest.add_mapping %r%^lib/(.*)\.rb$% do |_, match|
    ["test/#{match[1]}_test.rb"]
  end

  # option to use for unit_diff
  autotest.unit_diff = "cat"
end

class Autotest
  # don't rerun the entire suite when fixing broken specs
  def rerun_all_tests
  end
end

I can tell this is related to testing, but, what on earth? It looks like it scans an application for tests and runs them.
How far off am I?

Sorry, been awake for the last 17 hours and I'm curious 🍰

this is my ~/.autotest file