Integration testing of a golang app with rspec and capybara-webkit.

go_build.rb

module GoBuild
  extend self

  def build(file)
    process = ChildProcess.build('go', 'build', file)
    err = Tempfile.new('stderr-spec')
    process.io.stderr = err
    process.start
    process.poll_for_exit(10)
    err.rewind
    unless process.exit_code == 0
      fail err.read
    end
  end
end

spec_helper.rb

require 'capybara/rspec'
require 'capybara/webkit'
require 'childprocess'
require 'support/quiet_webkit'
require 'support/go_build'

Capybara.javascript_driver = :quiet_webkit

RSpec.configure do |config|
  config.before(:all) do
    GoBuild.build('server.go')
    $child_process = ChildProcess.build('./server')
    $child_process.start
    Capybara.app_host = 'http://localhost:8080'
  end

  config.before(:each) do
    fail "App is down" unless $child_process.alive?
  end

  config.after(:all) do
    $child_process.stop if $child_process
  end
end