Never use Session middleware in test environment [sinatra#119]

compat/sessions_test.rb

@@ -21,6 +21,7 @@
 
   specify "should be able to store data accross requests" do
     set_option :sessions, true
+    set_option :environment, :not_test # necessary because sessions are disabled
 
     get '/foo' do
       session[:test] = true
@@ -34,6 +35,8 @@
     get_it '/foo', :env => { :host => 'foo.sinatrarb.com' }
     assert ok?
     assert include?('Set-Cookie')
+
+    set_option :environment, :test
   end
 
 end

lib/sinatra/base.rb

@@ -776,7 +776,7 @@ def prototype
       # an instance of the class new was called on.
       def new(*args, &bk)
         builder = Rack::Builder.new
-        builder.use Rack::Session::Cookie if sessions?
+        builder.use Rack::Session::Cookie if sessions? && !test?
         builder.use Rack::CommonLogger if logging?
         builder.use Rack::MethodOverride if methodoverride?
         @middleware.each { |c, args, bk| builder.use(c, *args, &bk) }