Does not detect changes when I have code and tests in the same directory

[ticviking]

I am using guard-minitest to practice code katas with what I thought was a pretty simple setup.

the directory looks like

Gemfile
Guardfile
kata.rb
kata_spec.rb

My gemfile is

gem 'minitest'
gem 'minitest-reporters'
gem 'guard'
gem 'guard-minitest'

with the following guardfile

guard :minitest, test_folders:"." do
  watch(%r{(.*)_spec\.rb$})
  watch(%r{(.+)\.rb$}) {|m| "#{m[0]}_spec.rb"}
end

kata_spec.rb looks like this

require 'minitest/autorun'
require 'minitest/reporters'
MiniTest::Reporters.use! Minitest::Reporters::SpecReporter.new
require'./kata'

# Red -> Green -> Refactor

with kata.rb empty.

and the spec runs fine when I first do bundle exec guard but seems to stop execution when I edit any of the files.

I can verify that the files I changes are being detected by guard when I set -d and LISTEN_GEM_DEBUGGING

when I trigger minitest from the guard prompt everything works as expected.