This is a spinoff from making our local developer build faster. The intention is to run a whole bunch of independant tests in parallel without overloading the computer by spinning them all up at once. We were able to reduce our total build time from about 40 mins to about 10 mins, and our total frustration by more than 100 times!
For example, in lib/tasks/fast.rake require 'fast_rake'
namespace :fast do
setup_tasks = [
"environment:testing",
"clean_and_package",
"db:migrate"
]
tests = [
"spec:covered",
"cucumber:firefox_g1",
"cucumber:firefox_g2",
"cucumber:firefox_g2",
"cucumber:firefox_ungrouped",
"cucumber:firefox_offline_g1",
"cucumber:firefox_offline_g2",
"cucumber:firefox_offline_g2",
"cucumber:firefox_offline_ungrouped",
"jasmine:integration",
"jasmine:chrome_integration",
"jasmine:phantom",
"quality"
]
FastRake::fast_runner_task(:all, setup_tasks, tests, true)
end
task :fast, [:count, :list] => "fast:all"
Then task:all will have been created, which when run will run the full set of your tests.
This will autodetect the number of processors that you have available to run your tasks. If you want to specify the number of processes that should run in parallel, then this accepts a fifth positional parameter. Or you can pass an integer from the command line
rake fast[4]
The fourth parameter specifies whether it should fail fast (stop after the first failure) or instead execute every task (and show all failures).
These tasks can also be executed with a specific list of tasks (with or without a processor count):
rake fast:all[,'task1 task2']"
or rake fast:all[4,'task1 task2']"
Or you can use:
FastRake::fast_runner_task(:smaller_set, setup_tasks, a_smaller_subset, false)
to create a single task named fast:smaller_set that runs a specific subset of tasks.
A database is created for each task by the name of the task, to use these you should modify your database.yml to contain something like:
test:
adapter: postgresql
host: localhost
database: <%= ENV["TEST_DB_NAME"] %>
username: <%= ENV['USER'] %>
min_messages: WARNING
Some environment variables are setup for your use.
TEST_DB_NAME: this is the name of the database that has been created
TEST_ENV_NUMBER: this is an incrementing number for each task that is started. Useful for ensuring unique resources for running tests (ports etc)
Include in your Gemfile
gem 'fast_rake'
(The MIT License)
Copyright (c) 2012 Jonathan Ricketson
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