Speedup Test::Unit + RSpec + Cucumber by running parallel on multiple CPUs (or cores).
ParallelTests splits tests into even groups(by number of tests or runtime) and runs each group in a single process with its own database. [upgrading from 0.6 ?](https://github.com/grosser/parallel_tests/wiki/Upgrading-0.6.x-to-0.7.x) Setup for Rails =============== [RailsCasts episode #413 Fast Tests](http://railscasts.com/episodes/413-fast-tests) [still using Rails 2?](https://github.com/grosser/parallel_tests/blob/master/ReadmeRails2.md) ### Install If you use RSpec: ensure you got >= 2.4 As gem ```ruby # add to Gemfile gem "parallel_tests", :group => :development ``` OR as plugin rails plugin install git://github.com/grosser/parallel_tests.git ```ruby # add to Gemfile gem "parallel", :group => :development ``` ### Add to `config/database.yml` ParallelTests uses 1 database per test-process.
Process number123
`ENV['TEST_ENV_NUMBER']`'''2''3'
```yaml test: database: yourproject_test<%= ENV['TEST_ENV_NUMBER'] %> ``` ### Create additional database(s) rake parallel:create ### Copy development schema (repeat after migrations) rake parallel:prepare ### Run! rake parallel:test # Test::Unit rake parallel:spec # RSpec rake parallel:features # Cucumber rake parallel:test[1] --> force 1 CPU --> 86 seconds rake parallel:test --> got 2 CPUs? --> 47 seconds rake parallel:test --> got 4 CPUs? --> 26 seconds ... Test by pattern (e.g. use one integration server per subfolder / see if you broke any 'user'-related tests) rake parallel:test[^test/unit] # every test file in test/unit folder rake parallel:test[user] # run users_controller + user_helper + user tests rake parallel:test['user|product'] # run user and product related tests ### Example output 2 processes for 210 specs, ~ 105 specs per process ... test output ... 843 examples, 0 failures, 1 pending Took 29.925333 seconds ### Run an arbitrary task in parallel ```Bash RAILS_ENV=test parallel_test -e "rake my:custom:task" # or rake parallel:rake[my:custom:task] ``` Running things once =================== ```Ruby # effected by race-condition: first process may boot slower the second # either sleep a bit or use a lock for example File.lock ParallelTests.first_process? ? do_something : sleep(1) at_exit do if ParallelTests.first_process? ParallelTests.wait_for_other_processes_to_finish undo_something end end ``` Loggers =================== Even process runtimes ----------------- Log test runtime to give each process the same runtime. Rspec: Add to your `.rspec_parallel` (or `.rspec`) : If installed as plugin: -I vendor/plugins/parallel_tests/lib --format progress --format ParallelTests::RSpec::RuntimeLogger --out tmp/parallel_runtime_rspec.log Test::Unit: Add to your `test_helper.rb`: ```ruby require 'parallel_tests/test/runtime_logger' ``` RSpec: SummaryLogger -------------------- This logger logs the test output without the different processes overwriting each other. Add the following to your `.rspec_parallel` (or `.rspec`) : If installed as plugin: -I vendor/plugins/parallel_tests/lib --format progress --format ParallelTests::RSpec::SummaryLogger --out tmp/spec_summary.log RSpec: FailuresLogger ----------------------- This logger produces pasteable command-line snippets for each failed example. E.g. rspec /path/to/my_spec.rb:123 # should do something Add the following to your `.rspec_parallel` (or `.rspec`) : If installed as plugin: -I vendor/plugins/parallel_tests/lib --format progress --format ParallelTests::RSpec::FailuresLogger --out tmp/failing_specs.log Cucumber: FailuresLogger ----------------------- This logger logs failed cucumber scenarios to the specified file. The filename can be passed to cucumber, prefixed with '@' to rerun failures. Usage: cucumber --format ParallelTests::Cucumber::FailuresLogger --out tmp/cucumber_failures.log Or add the formatter to the `parallel:` profile of your `cucumber.yml`: parallel: --format progress --format ParallelTests::Cucumber::FailuresLogger --out tmp/cucumber_failures.log To rerun failures: cucumber @tmp/cucumber_failures.log Setup for non-rails =================== gem install parallel_tests # go to your project dir parallel_test test/ parallel_rspec spec/ parallel_cucumber features/ - use ENV['TEST_ENV_NUMBER'] inside your tests to select separate db/memcache/etc. - Only run selected files & folders: parallel_test test/bar test/baz/foo_text.rb Options are: -n [PROCESSES] How many processes to use, default: available CPUs -p, --pattern [PATTERN] run tests matching this pattern --group-by [TYPE] group tests by: found - order of finding files steps - number of cucumber steps default - runtime or filesize -m, --multiply-processes [FLOAT] use given number as a multiplier of processes to run -s, --single [PATTERN] Run all matching files in the same process -i, --isolate Do not run any other tests in the group used by --single(-s) -e, --exec [COMMAND] execute this code parallel and with ENV['TEST_ENV_NUM'] -o, --test-options '[OPTIONS]' execute test commands with those options -t, --type [TYPE] test(default) / rspec / cucumber --serialize-stdout Serialize stdout output, nothing will be written until everything is done --non-parallel execute same commands but do not in parallel, needs --exec --no-symlinks Do not traverse symbolic links to find test files --ignore-tags [PATTERN] When counting steps ignore scenarios with tags that match this pattern --nice execute test commands with low priority. -v, --version Show Version -h, --help Show this. You can run any kind of code in parallel with -e / --execute parallel_test -n 5 -e 'ruby -e "puts %[hello from process #{ENV[:TEST_ENV_NUMBER.to_s].inspect}]"' hello from process "2" hello from process "" hello from process "3" hello from process "5" hello from process "4"
1 Process2 Processes4 Processes
RSpec spec-suite18s14s10s
Rails-ActionPack88s53s44s
TIPS ==== - [RSpec] add a `.rspec_parallel` to use different options, e.g. **no --drb** - [RSpec] delete `script/spec` - [[Spork](https://github.com/sporkrb/spork)] does not work with parallel_tests - [RSpec] remove --loadby from you spec/*.opts - [RSpec] Instantly see failures (instead of just a red F) with [rspec-instafail](https://github.com/grosser/rspec-instafail) - [Bundler] if you have a `Gemfile` then `bundle exec` will be used to run tests - [Cucumber] add a `parallel: foo` profile to your `config/cucumber.yml` and it will be used to run parallel tests - [Capybara setup](https://github.com/grosser/parallel_tests/wiki) - [Sphinx setup](https://github.com/grosser/parallel_tests/wiki) - [Capistrano setup](https://github.com/grosser/parallel_tests/wiki/Remotely-with-capistrano) let your tests run on a big box instead of your laptop - [SQL schema format] use :ruby schema format to get faster parallel:prepare` - `export PARALLEL_TEST_PROCESSORS=X` in your environment and parallel_tests will use this number of processors by default - [ZSH] use quotes to use rake arguments `rake "parallel:prepare[3]"` - [email_spec and/or action_mailer_cache_delivery](https://github.com/grosser/parallel_tests/wiki) - [Memcached] use different namespaces e.g. `config.cache_store = ..., :namespace => "test_#{ENV['TEST_ENV_NUMBER']}"` TODO ==== - make tests consistently pass with `--order random` in .rspec - fix tests vs cucumber >= 1.2 `unknown option --format` - add integration tests for the rake tasks, maybe generate a rails project ... - add unit tests for cucumber runtime formatter - make windows compatible Authors ==== inspired by [pivotal labs](http://pivotallabs.com/users/miked/blog/articles/849-parallelize-your-rspec-suite) ### [Contributors](http://github.com/grosser/parallel_tests/contributors) - [Charles Finkel](http://charlesfinkel.com/) - [Indrek Juhkam](http://urgas.eu) - [Jason Morrison](http://jayunit.net) - [jinzhu](http://github.com/jinzhu) - [Joakim Kolsjö](http://www.rubyblocks.se) - [Kevin Scaldeferri](http://kevin.scaldeferri.com/blog/) - [Kpumuk](http://kpumuk.info/) - [Maksim Horbul](http://github.com/mhorbul) - [Pivotal Labs](http://www.pivotallabs.com) - [Rohan Deshpande](http://github.com/rdeshpande) - [Tchandy](http://thiagopradi.net/) - [Terence Lee](http://hone.heroku.com/) - [Will Bryant](http://willbryant.net/) - [Fred Wu](http://fredwu.me) - [xxx](https://github.com/xxx) - [Levent Ali](http://purebreeze.com/) - [Michael Kintzer](https://github.com/rockrep) - [nathansobo](https://github.com/nathansobo) - [Joe Yates](http://titusd.co.uk) - [asmega](http://www.ph-lee.com) - [Doug Barth](https://github.com/dougbarth) - [Geoffrey Hichborn](https://github.com/phene) - [Trae Robrock](https://github.com/trobrock) - [Lawrence Wang](https://github.com/levity) - [Sean Walbran](https://github.com/seanwalbran) - [Lawrence Wang](https://github.com/levity) - [Potapov Sergey](https://github.com/greyblake) - [Łukasz Tackowiak](https://github.com/lukasztackowiak) - [Pedro Carriço](https://github.com/pedrocarrico) - [Pablo Manrubia Díez](https://github.com/pmanrubia) - [Slawomir Smiechura](https://github.com/ssmiech) - [Georg Friedrich](https://github.com/georg) - [R. Tyler Croy](https://github.com/rtyler) - [Ulrich Berkmüller](https://github.com/ulrich-berkmueller) - [Grzegorz Derebecki](https://github.com/madmax) - [Florian Motlik](https://github.com/flomotlik) - [Artem Kuzko](https://github.com/akuzko) - [Zeke Fast](https://github.com/zekefast) - [Joseph Shraibman](https://github.com/jshraibman-mdsol) - [David Davis](https://github.com/daviddavis) - [Ari Pollak](https://github.com/aripollak) - [Aaron Jensen](https://github.com/aaronjensen) - [Artur Roszczyk](https://github.com/sevos) - [Caleb Tomlinson](https://github.com/calebTomlinson) - [Jawwad Ahmad](https://github.com/jawwad) - [Iain Beeston](https://github.com/iainbeeston) - [Alejandro Pulver](https://github.com/alepulver) - [Felix Clack](https://github.com/felixclack) [Michael Grosser](http://grosser.it)
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License: MIT
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