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1)
Rack::Flash::SessionUnavailable in 'Test flash in test environment'
Rack::Flash depends on session middleware.
(eval):3:in `get'
/home/ron/161426/rack-flash spec.rb:30:in `block (2 levels) in <top (required)>'

Finished in 0.0519955609999999 seconds

3 examples, 1 failure

rack-flash example.rb

require 'sinatra'
require 'rack-flash'

use Rack::Flash

enable :sessions

get '/' do
  flash[:message] || 'No flash'
end

get '/set' do
  flash[:message] = 'Hello!'
  'Flash message set!'
end

rack-flash spec.rb

require 'rubygems'
require 'spec'
require 'spec/interop/test'
require 'rack/test'

require 'rack-flash example.rb'

Sinatra::Base.set :environment, :production

Spec::Runner.configure { |c| c.include Rack::Test::Methods }

def app
  Sinatra::Application.new
end

describe 'Test' do
  specify 'no flash' do
    get '/'
    last_response.body.should eql 'No flash'
  end

  specify 'flash' do
    get '/set'
    get '/'
    last_response.body.should eql 'Hello!'
  end

  specify 'flash in test environment' do
    Sinatra::Base.set :environment, :test 
    get '/set'
    get '/'
    last_response.body.should eql 'Hello!'
  end
end