Trying to create a test case for missing a slash when dealing with engines.

output

$ ruby test_case_missing_slash.rb      
Run options: --seed 62773

# Running:

D, [2014-09-25T10:40:05.782387 #7511] DEBUG -- : 
D, [2014-09-25T10:40:05.782441 #7511] DEBUG -- : 
I, [2014-09-25T10:40:05.782843 #7511]  INFO -- : Started GET "/test" for 127.0.0.1 at 2014-09-25 10:40:05 -0700
F, [2014-09-25T10:40:05.783768 #7511] FATAL -- : 
RuntimeError (Could not find root path for #<TestEngine1::Engine:0x007f3beee14110>):
  test_missing_slash.rb:49:in `test_another_get'


FD, [2014-09-25T10:40:05.784740 #7511] DEBUG -- : 
D, [2014-09-25T10:40:05.784775 #7511] DEBUG -- : 
I, [2014-09-25T10:40:05.784846 #7511]  INFO -- : Started GET "/" for 127.0.0.1 at 2014-09-25 10:40:05 -0700
.

Finished in 0.152034s, 13.1549 runs/s, 13.1549 assertions/s.

  1) Failure:
BugTest#test_another_get [test_missing_slash.rb:50]:
Failed assertion, no message given.

2 runs, 2 assertions, 1 failures, 0 errors, 0 skips

test_case_missing_slash.rb

gem 'rails', '4.1.6'

require 'rails'
require 'action_controller/railtie'

module TestEngine1
  class Engine < ::Rails::Engine
  end
end

TestEngine1::Engine.routes.draw do
  get '/test', to: lambda { |env|
    [200, {"Content-Type" => "text/html"}, [env['PATH_INFO']]]
  }
end

class TestApp < Rails::Application
  config.root = File.dirname(__FILE__)
  config.session_store :cookie_store, key: 'cookie_store_key'
  config.secret_token = 'secret_token'
  config.secret_key_base = 'secret_key_base'

  config.logger = Logger.new($stdout)
  Rails.logger = config.logger

  routes.draw do
    get '/', to: lambda { |env|
      [200, {"Content-Type" => "text/html"}, [env['PATH_INFO']]]
    }
    mount TestEngine1::Engine => '/'
  end
end

require 'minitest/autorun'
require 'rack/test'

# Ensure backward compatibility with Minitest 4
Minitest::Test = MiniTest::Unit::TestCase unless defined?(Minitest::Test)

class BugTest < MiniTest::Test
  include Rack::Test::Methods

  def test_returns_success
    get '/'
    assert last_response.ok?
  end

  def test_another_get
    get '/test'
    assert last_response.ok?
  end

  private
    def app
      Rails.application
    end
end