```ruby
require 'bundler'
Bundler.require

require "opal-rspec"
require "react/source"

Opal.append_path File.expand_path('../spec', __FILE__)

run Opal::Server.new { |s|
  s.main = 'opal/rspec/sprockets_runner'
  s.append_path 'spec'
  s.append_path 'spec/vendor'
  s.append_path File.dirname(::React::Source.bundled_path_for("react-with-addons.js"))
  s.debug = true
  s.index_path = 'spec/reactjs/index.html.erb'
}
```

Clean up browser rack file
user
```ruby
Bundler.require

require 'opal-rspec'
require 'react/source'

sprockets_env = Opal::RSpec::SprocketsEnvironment.new
run Opal::Server.new(sprockets: sprockets_env) { |s|
      s.main = 'opal/rspec/sprockets_runner'
      sprockets_env.add_spec_paths_to_sprockets
      s.debug = false
      s.append_path File.dirname(::React::Source.bundled_path_for("react-with-addons.js"))
    }
```
assistant