Test case

.rvmrc

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+rvm use 1.9.2@rack_fiber_pool_test_app --create

Gemfile

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+source :rubygems
+gem 'rack'
+gem 'rack-fiber_pool', :require => 'rack/fiber_pool'
+gem 'eventmachine'
+gem 'em-http-request'
+gem 'em-synchrony'
+gem 'thin'
+
+group :test do
+  gem 'rack-test', :require => 'rack/test'
+end

Gemfile.lock

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+GEM
+  remote: http://rubygems.org/
+  specs:
+    addressable (2.2.4)
+    daemons (1.1.2)
+    em-http-request (0.3.0)
+      addressable (>= 2.0.0)
+      escape_utils
+      eventmachine (>= 0.12.9)
+    em-synchrony (0.2.0)
+      eventmachine (>= 0.12.9)
+    escape_utils (0.2.3)
+    eventmachine (0.12.10)
+    rack (1.2.2)
+    rack-fiber_pool (0.9.1)
+    rack-test (0.5.6)
+      rack (>= 1.0)
+    thin (1.2.11)
+      daemons (>= 1.0.9)
+      eventmachine (>= 0.12.6)
+      rack (>= 1.0.0)
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  em-http-request
+  em-synchrony
+  eventmachine
+  rack
+  rack-fiber_pool
+  rack-test
+  thin

config.ru

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+require './test_app.rb'
+use Rack::FiberPool
+run TestApp

test.rb

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+require './test_app.rb'
+Bundler.require :test
+require 'minitest/autorun'
+
+describe TestApp do
+  include Rack::Test::Methods
+  def app; TestApp end
+
+  describe 'any request' do
+    it 'returns google.com with EM' do
+      get '/get_google'
+      last_response.status.must_equal 200
+      (last_response.body.length > 0).must_equal true
+    end
+  end
+end

test_app.rb

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+Bundler.setup
+Bundler.require
+
+class TestApp
+  def self.call(env)
+    result = EM::Synchrony.sync EventMachine::HttpRequest.new('http://google.com').get
+    [200, {"Content-Type" => "text/html"}, [result.response]]
+  end
+end