don't write to s3 when unit testing

Author: laurelfan

dashboard/test/controllers/level_sources_controller_test.rb

@@ -5,9 +5,6 @@ class LevelSourcesControllerTest < ActionController::TestCase
     @admin = create(:admin)
     @level_source = create(:level_source)
     @hidden_level_source = create(:level_source, hidden: true)
-
-    # so we actually test this
-    CDO.disable_s3_image_uploads = false
   end
 
   test "should get edit" do

dashboard/test/test_helper.rb

@@ -25,6 +25,8 @@ class ActiveSupport::TestCase
 
   setup do
     set_env :test
+
+    AWS::S3.stubs(:upload_to_bucket).raises("Don't actually upload anything to S3 in tests... mock it if you want to test it")
   end
 
   teardown do