Tests: added test for "SCRIPT_NAME" variable in Ruby.

test/ruby/variables/config.ru

@@ -8,6 +8,7 @@ app = Proc.new do |env|
         'Request-Method' => env['REQUEST_METHOD'],
         'Request-Uri' => env['REQUEST_URI'],
         'Http-Host' => env['HTTP_HOST'],
+        'Script-Name' => env['SCRIPT_NAME'],
         'Server-Protocol' => env['SERVER_PROTOCOL'],
         'Server-Software' => env['SERVER_SOFTWARE'],
         'Custom-Header' => env['HTTP_CUSTOM_HEADER'],

test/test_ruby_application.py

@@ -44,6 +44,7 @@ class TestRubyApplication(TestApplicationRuby):
             'Request-Method': 'POST',
             'Request-Uri': '/',
             'Http-Host': 'localhost',
+            'Script-Name': 'config.ru',
             'Server-Protocol': 'HTTP/1.1',
             'Custom-Header': 'blah',
             'Rack-Version': '13',