RSpeed splits your specs to you run parallels tests.

Add the following code on your Gemfile and run bundle install:

gem 'rspeed'

We need to extract the rake that executes the split via rspeed:run.

rake rspeed:install

• RSPEED_APP: You app name to avoid data override
• RSPEED_PIPE: Current pipe
• RSPEED_PIPES: Quantity of pipes
• RSPEED_SPEC_PATH: The specs folders path
• RSPEED: Enables RSpeed

RSPEED=true RSPEED_APP=blog RSPEED_PIPE=1 RSPEED_PIPES=3 bundle exec rake rspeed:run

1. Since we have no statistics on the first time, we run all specs and collect it;

{ "file": "./spec/models/1_spec.rb", "time": 0.01 }
{ "file": "./spec/models/2_spec.rb", "time": 0.02 }
{ "file": "./spec/models/3_spec.rb", "time": 0.001 }
{ "file": "./spec/models/4_spec.rb", "time": 1 }

1. Previous statistics is balanced by times and distributed between pipes:

{ "file": "./spec/models/4_spec.rb", "time": 1 }

{ "file": "./spec/models/2_spec.rb", "time": 0.02 }

{ "file": "./spec/models/3_spec.rb", "time": 0.001 }
{ "file": "./spec/models/1_spec.rb", "time": 0.01 }

2. Run the current pipe 1:

{ "file": "./spec/models/4_spec.rb", "time": 1 }

• Collects statistics and temporary save it;

4. Run the current pipe 2:

{ "file": "./spec/models/2_spec.rb", "time": 0.02 }

• Collects statistics and temporary save it;

5. Run the current pipe 3:

{ "file": "./spec/models/3_spec.rb", "time": 0.001 }
{ "file": "./spec/models/1_spec.rb", "time": 0.01 }

• Collects statistics and temporary save it;
• Sum all the last statistics and save it for the next run;