Speedup RSpec + Test::Unit + Cucumber by running parallel on multiple CPUs.

sudo gem install parallel
script/plugin install git://github.com/grosser/parallel_specs.git

test:
  database: xxx_test<%= ENV['TEST_ENV_NUMBER'] %>

script/db_console
create database xxx_test2;
...

rake parallel:prepare

rake parallel:spec          # RSpec
rake parallel:test          # Test::Unit
rake parallel:features      # Cucumber

rake parallel:spec[1] --> force 1 CPU --> 86 seconds
rake parallel:spec    --> got 2 CPUs? --> 47 seconds
rake parallel:spec    --> got 4 CPUs? --> 26 seconds
...

Test just a subfolder (e.g. use one integration server per subfolder) rake parallel:spec[models] rake parallel:test[something/else]

partial paths are OK too...
rake parallel:test[functional] == rake parallel:test[fun]

2 processes for 210 specs, ~ 105 specs per process
... test output ...

Results:
877 examples, 0 failures, 11 pending
843 examples, 0 failures, 1 pending

Took 29.925333 seconds

Add to your spec/parallel_spec.opts (or spec/spec.opts) : --format ParallelSpecs::SpecRuntimeLogger:tmp/parallel_profile.log It will log test runtime and partition the test-load accordingly.

• [RSpec] add a spec/parallel_spec.opts to use different options, e.g. no --drb (default: spec/spec.opts)
• [RSpec] if something looks fishy try to delete script/spec
• [RSpec] if script/spec is missing parallel:spec uses just spec (which solves some issues with double-loaded environment.rb)
• [RSpec] 'script/spec_server' or spork do not work in parallel
• [RSpec] ./script/generate rspec if you are running rspec from gems (this plugin uses script/spec which may fail if rspec files are outdated)
• [Bundler] if you have a .bundle/environment.rb then bundle exec xxx will be used to run tests
• with zsh this would be rake "parallel:prepare[3]"

• make spec runtime recording/evaluating work with sub-folders
• add gem + cli interface parallel_specs + parallel_tests + parallel_features -> non-rails projects
• build parallel:bootstrap idea/basics
• make jRuby compatible basics
• make windows compatible (does anyone care ?)

inspired by pivotal labs

###Contributors (alphabetical)

• Charles Finkel
• Jason Morrison
• Joakim Kolsjö
• Kpumuk
• Maksim Horbu
• Rohan Deshpande
• Tchandy
• Terence Lee
• Will Bryant

Michael Grosser
[email protected]
Hereby placed under public domain, do what you want, just do not hold me accountable...