Add test for configurable port

features/configurable_port.feature

@@ -0,0 +1,43 @@
+Feature: Configurable port
+
+  Background:
+    Given I have "dredd-hooks-php" command installed
+    And I have "dredd" command installed
+    And a file named "server.rb" with:
+      """
+      require 'sinatra'
+      get '/message' do
+        "Hello World!\n\n"
+      end
+      """
+
+    And a file named "apiary.apib" with:
+      """
+      # My Api
+      ## GET /message
+      + Response 200 (text/html;charset=utf-8)
+          Hello World!
+      """
+
+  @announce
+  Scenario:
+    Given a file named "hookfile/.{{myextension}}" with:
+      """
+      ## So, replace following pseudo code with yours:
+      #
+      #require 'mylanguagehooks'
+      #
+      #key = 'hooks_modifications'
+      #
+      #before("/message > GET") { |transaction|
+      #  puts 'listening on different port'
+      #}
+      """
+
+    When I run `dredd ./apiary.apib http://localhost:4567 --hooks-worker-handler-port 61325 --server "ruby server.rb" --language "dredd-hooks-{{mylanguage}}" --hookfiles ./hookfile.{{myextension}}`
+    Then the exit status should be 0
+    Then the output should contain:
+      """
+      listening on different port
+      """
+