Many lock-closuretree--* files in project dir after spec run

[Ev Dolzhenko]

I wonder if that is

1. normal behaviour
2. can be something like Dir.tmpdir used for lock storage?

[Matthew McEachen]

1. It is to be expected if you aren't using MySQL or Postgresql in your tests, and you aren't setting ENV['FLOCK_DIR'].
2. In your spec_helper or minitest_helper, add a before and after block:

before do
  ENV['FLOCK_DIR'] = Dir.mktmpdir
  …
end

after do
  FileUtils.remove_entry_secure ENV['FLOCK_DIR']
end

If you're using sqlite in your production code, make sure the same FLOCK_DIR value (that isn't a temporary directory) is set consistently across all ruby processes. I'll add a reference to this in the README.