Rails parallel_tests with RSpec Request Specs: Address already in use error

Question

When I try to run my specs in parallel using the parallel_tests Gem, I am getting these error messages:

foo:~/Projects/cucumber-capybara-saucelabs/spec/requests [] ➜ rake parallel:spec
(in /Volumes/Storage/Projects/cucumber-capybara-saucelabs)
8 processes for 5 specs, ~ 0 specs per process
Starting Rails server on port 3001...
Starting Rails server on port 3001...
Starting Rails server on port 3001...
Starting Rails server on port 3001...
Starting Rails server on port 3001...
[2013-05-22 14:40:12] INFO  WEBrick 1.3.1
[2013-05-22 14:40:12] INFO  ruby 1.9.3 (2013-02-22) [x86_64-darwin12.3.0]
[2013-05-22 14:40:12] INFO  WEBrick::HTTPServer#start: pid=33256 port=3001
Rails server running!
Rails server running!
Rails server running!
Rails server running!
[2013-05-22 14:40:12] INFO  WEBrick 1.3.1
[2013-05-22 14:40:12] INFO  WEBrick 1.3.1
[2013-05-22 14:40:12] INFO  ruby 1.9.3 (2013-02-22) [x86_64-darwin12.3.0]
[2013-05-22 14:40:12] INFO  WEBrick 1.3.1
[2013-05-22 14:40:12] INFO  ruby 1.9.3 (2013-02-22) [x86_64-darwin12.3.0]
[2013-05-22 14:40:12] INFO  ruby 1.9.3 (2013-02-22) [x86_64-darwin12.3.0]
[2013-05-22 14:40:12] WARN  TCPServer Error: Address already in use - bind(2)
[2013-05-22 14:40:12] WARN  TCPServer Error: Address already in use - bind(2)
[2013-05-22 14:40:12] WARN  TCPServer Error: Address already in use - bind(2)
/Users/foo/.rvm/rubies/ruby-1.9.3-p392/lib/ruby/1.9.1/webrick/utils.rb:85:in `initialize': Address already in use - bind(2) (/Users/foo/.rvm/rubies/ruby-1.9.3-p392/lib/ruby/1.9.1/webrick/utils.rb:85:in `initialize': Address already in use - bind(2) (Errno::EADDRINUSE)
    from /Users/foo/.rvm/rubies/ruby-1.9.3-p392/lib/ruby/1.9.1/webrick/utils.rb:85:in `new'
    from /Users/foo/.rvm/rubies/ruby-1.9.3-p392/lib/ruby/1.9.1/webrick/utils.rb:85:in `block in create_listeners'
    from /Users/foo/.rvm/rubies/ruby-1.9.3-p392/lib/ruby/1.9.1/webrick/utils.rb:82:in `each'
    from /Users/foo/.rvm/rubies/ruby-1.9.3-p392/lib/ruby/1.9.1/webrick/utils.rb:82:in `create_listeners'
    from /Users/foo/.rvm/rubies/ruby-1.9.3-p392/lib/ruby/1.9.1/webrick/server.rb:82:in `listen'
    from /Users/foo/.rvm/rubies/ruby-1.9.3-p392/lib/ruby/1.9.1/webrick/server.rb:70:in `initialize'
    from /Users/foo/.rvm/rubies/ruby-1.9.3-p392/lib/ruby/1.9.1/webrick/httpserver.rb:45:in `initialize'
    from /Users/foo/.rvm/gems/ruby-1.9.3-p392@rails-3/gems/rack-1.4.5/lib/rack/handler/webrick.rb:10:in `new'
    from /Users/foo/.rvm/Users/foo/.rvm/gems/ruby-1.9.3-p392@rails-3/gems/rack-1.4.5/lib/rack/server.rb:323:in `delete': No such file or directory - /Volumes/Storage/Projects/cucumber-capybara-saucelabs/tmp/pids/server.pid (Errno::ENOENT)
    from /Users/foo/.rvm/gems/ruby-1.9.3-p392@rails-3/gems/rack-1.4.5/lib/rack/server.rb:323:in `block in write_pid'
/Users/foo/.rvm/rubies/ruby-1.9.3-p392/lib/ruby/1.9.1/webrick/utils.rb:85:in `initialize': Address already in use - bind(2) (Errno::EADDRINUSE)
    from /Users/foo/.rvm/rubies/ruby-1.9.3-p392/lib/ruby/1.9.1/webrick/utils.rb:85:in `new'
    from /Users/foo/.rvm/rubies/ruby-1.9.3-p392/lib/ruby/1.9.1/webrick/utils.rb:85:in `block in create_listeners'
    from /Users/foo/.rvm/rubies/ruby-1.9.3-p392/lib/ruby/1.9.1/webrick/utils.rb:82:in `each'
    from /Users/foo/.rvm/rubies/ruby-1.9.3-p392/lib/ruby/1.9.1/webrick/utils.rb:82:in `create_listeners'
    from /Users/foo/.rvm/rubies/ruby-1.9.3-p392/lib/ruby/1.9.1/webrick/server.rb:82:in `listen'
    from /Users/foo/.rvm/rubies/ruby-1.9.3-p392/lib/ruby/1.9.1/webrick/server.rb:70:in `initialize'
    from /Users/foo/.rvm/rubies/ruby-1.9.3-p392/lib/ruby/1.9.1/webrick/httpserver.rb:45:in `initialize'
    from /Users/foo[2013-05-22 14:40:12] INFO  WEBrick 1.3.1
sa/.rvm/gems/ruby-1.9.3-p392@rails-3/gems/rack-1.4.5/lib/rack/handler/webrick.rb:10:in `new'
    from /Users/foo/.rvm/gems/ruby-1.9.3-p392@rails-3/gems/rack-1.4.5/lib/rack/handler/webrick.rb:10:in `run'
    from /Users/foo/.rvm/gems/ruby-1.9.3-p392@rails-3/gems/rack-1.4.5/lib/rack/server.rb:268:in `start'
    from /Users/foo/.rvm/gems/ruby-1.9.3-p392@rails-3/gems/railties-3.2.13/lib/rails/commands/server.rb:70:in `start'
    from /Users/foo/.rvm/gems/ruby-1.9.3-p392@rails-3/gems/railties-3.2.13/lib/rails/commands.rb:55:in `block in <top (required)>'
    from /Users/foo/.rvm/gems/ruby-1.9.3-p392@rails-3/gems/railties-3.2.13/lib/rails/commands.rb:50:in `tap'
    from /Users/foo/.rvm/gems/ruby-1.9.3-p392@rails-3/gems/railties-3.2.13/lib/rails/commands.rb:50:in `<top (required)>'
    from script/rails:6:in `require'
    from script/rails:6:in `<main>'

Is there a way to avoid this?

Answer 1

As explained in the wiki, you need to do:

Capybara.server_port = 9887 + ENV['TEST_ENV_NUMBER'].to_i