Add a simple handler for the test event

- Test that we can access the GH API with the configured token

Author: pbrisbin

lib/cc/services/github_pull_requests.rb

@@ -20,6 +20,17 @@ class Config < CC::Service::Config
   BODY_REGEX = %r{<b>Code Climate</b> has <a href=".*">analyzed this pull request</a>}
   COMMENT_BODY = '<img src="https://codeclimate.com/favicon.png" width="20" height="20" />&nbsp;<b>Code Climate</b> has <a href="%s">analyzed this pull request</a>.'
 
+  # Just make sure we can access GH using the configured token. Without
+  # additional information (github-slug, PR number, etc) we can't test much
+  # else.
+  def receive_test
+    setup_http
+
+    http_get("#{BASE_URL}")
+
+    nil
+  end
+
   def receive_pull_request
     setup_http