diff --git a/spec/dummy/app/models/bad.rb b/spec/dummy/app/models/bad.rb
new file mode 100644
index 000000000..7179a1d45
--- /dev/null
+++ b/spec/dummy/app/models/bad.rb
@@ -0,0 +1,5 @@
+unless Rails.env.test?
+  class Bad
+    include ActiveModel::API
+  end
+end