add scenario for `remote set-url` functionality

features/remote_add.feature

@@ -74,6 +74,12 @@ Feature: hub remote add
     Then the url for "mm" should be "git://github.com/mislav/dotfiles.git"
     And there should be no output
 
+  Scenario: set-url
+    Given the "origin" remote has url "git://github.com/evilchelu/dotfiles.git"
+    When I successfully run `hub remote set-url origin mislav`
+    Then the url for "origin" should be "git://github.com/mislav/dotfiles.git"
+    And there should be no output
+
   Scenario: Add public remote including repo name
     When I successfully run `hub remote add mislav/dotfilez.js`
     Then the url for "mislav" should be "git://github.com/mislav/dotfilez.js.git"