Add a simple scenario for `heroku sauce:chrome`

features/cli/chrome.feature

@@ -0,0 +1,14 @@
+Feature: Start a chrome browser pointing at my Heroku site
+  In order to test my website in the Chrome browser
+  As a Heroku user
+  I should be able to fire up a Sauce Scout instance pointing at my Heroku
+  instance
+
+
+  Scenario: Without having configured Sauce
+    Given I haven't already configured the plugin
+    When I run `heroku sauce:chrome`
+    Then the output should contain:
+      """
+      Sauce for Heroku has not yet been configured!
+      """

features/step_definitions/browser_steps.rb

@@ -0,0 +1,4 @@
+Given /^I haven't already configured the plugin$/ do
+  # no op
+end
+

lib/sauce/heroku/cli.rb

@@ -53,6 +53,10 @@ access_key: #{apikey}
 """)
         end
       end
+
+      def chrome
+        display 'Sauce for Heroku has not yet been configured!'
+      end
     end
   end
 end