From b9512c97eec8f404997770de43ef31d7b9896e25 Mon Sep 17 00:00:00 2001
From: paresharma <paresharma@gmail.com>
Date: Wed, 25 Mar 2015 20:48:17 +0100
Subject: [PATCH] Exception handling

---
 lib/scorm_rte.rb         | 1 +
 lib/scorm_rte/errors.rb  | 3 +++
 lib/scorm_rte/lms/sco.rb | 4 ++--
 3 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/lib/scorm_rte.rb b/lib/scorm_rte.rb
index 616a08b..fde1eed 100644
--- a/lib/scorm_rte.rb
+++ b/lib/scorm_rte.rb
@@ -1,4 +1,5 @@
 require 'scorm_rte/engine'
+require 'scorm_rte/errors'
 require 'scorm_rte/lms/sco'
 require 'scorm_rte/lms/controllers/helpers'
 
diff --git a/lib/scorm_rte/errors.rb b/lib/scorm_rte/errors.rb
index e04a4a8..e4540e8 100644
--- a/lib/scorm_rte/errors.rb
+++ b/lib/scorm_rte/errors.rb
@@ -6,5 +6,8 @@ class ScormRteError < StandardError
   end
 
   class NoScoInstanceIdError < ScormRteError
+    def message
+      'Always provide a unique SCO intance ID'
+    end
   end
 end
diff --git a/lib/scorm_rte/lms/sco.rb b/lib/scorm_rte/lms/sco.rb
index 0ba03c1..2db8fac 100644
--- a/lib/scorm_rte/lms/sco.rb
+++ b/lib/scorm_rte/lms/sco.rb
@@ -2,8 +2,8 @@ module ScormRte
   module Lms
     class Sco
       def initialize(sco_instance_id: nil)
-        unless sco_instance_id
-          fail NoScoInstanceIdError, 'Always provide a unique SCO intance ID'
+        unless sco_instance_id.present?
+          fail NoScoInstanceIdError
         end
         @sco_instance_id = sco_instance_id
       end