1 files changed, 5 insertions, 2 deletions
diff --git a/activemodel/test/cases/observing_test.rb b/activemodel/test/cases/observing_test.rb
index 564451fa2f..fbf93c19ef 100644
--- a/activemodel/test/cases/observing_test.rb
+++ b/activemodel/test/cases/observing_test.rb
@@ -1,6 +1,8 @@
 require 'cases/helper'
 
-class ObservedModel < ActiveModel::Base
+class ObservedModel
+  include ActiveModel::Observing
+
   class Observer
   end
 end
@@ -17,7 +19,8 @@ class FooObserver < ActiveModel::Observer
   end
 end
 
-class Foo < ActiveModel::Base
+class Foo
+  include ActiveModel::Observing
 end
 
 class ObservingTest < ActiveModel::TestCase