test.rb

require "sinatra/base"
require "puma"
require "rack/handler/puma"
require "minitest/autorun"
require "net/http"
require "slim"

class App < Sinatra::Base
  
  post "/" do
    params
  end
end

builder = Rack::Builder.new { run App }

class AppTest < MiniTest::Unit::TestCase
  
  def setup
    @app = Rack::Lint.new(App)
    @server = nil
  
    @host = '127.0.0.1'
    @port = 9292
    
    @thread = Thread.new do
      Rack::Handler::Puma.run(@app, :Host => @host, :Port => @port) do |server|
        @server = server
      end
    end
  
    Thread.pass until @server && @server.running
  end
  
  def teardown
    @server.stop
    @thread.kill
  end
  
  def post(path, formdata={})
    Net::HTTP.start(@host, @port) { |http|
      post = Net::HTTP::Post.new(path)
      post.form_data = formdata
      http.request(post)
    }
  end
  
  def test_post_raises
    assert_raises { post("/") }
  end
end