$ bundle install --path vendor/bundle

$ bundle exec rake
[mongo] Warning: No private key present, creating unsigned gem.
rake aborted!
LoadError: cannot load such file -- mrss/spec_organizer
/home/jaruga/git/mongo-ruby-driver/Rakefile:21:in `require'
/home/jaruga/git/mongo-ruby-driver/Rakefile:21:in `<top (required)>'
/home/jaruga/git/mongo-ruby-driver/vendor/bundle/ruby/2.7.0/gems/rake-13.0.1/exe/rake:27:in `<top (required)>'
/usr/local/ruby-2.7.1/bin/bundle:23:in `load'
/usr/local/ruby-2.7.1/bin/bundle:23:in `<main>'
(See full trace by running task with --trace)

LoadError:
  cannot load such file -- mrss/lite_constraints
# ./spec/lite_spec_helper.rb:72:in `require'
# ./spec/lite_spec_helper.rb:72:in `<top (required)>'
# ./spec/spec_helper.rb:1:in `require'
# ./spec/spec_helper.rb:1:in `<top (required)>'
# ./spec/stress/fork_reconnect_stress_spec.rb:1:in `require'
# ./spec/stress/fork_reconnect_stress_spec.rb:1:in `<top (required)>'

-require 'mrss/spec_organizer'
+begin
+  require 'mrss/spec_organizer'
+rescue LoadError
+  warn '[FAIL] mrss/spec_organizer not found!'
+end