Raise a more helpful error for people who are using these extracted features

1 files changed, 30 insertions, 0 deletions

diff --git a/actionpack/test/controller/mime/responder_test.rb b/actionpack/test/controller/mime/responder_test.rb
new file mode 100644
index 0000000000..6201af3299
--- /dev/null
+++ b/actionpack/test/controller/mime/responder_test.rb
@@ -0,0 +1,30 @@
+require 'abstract_unit'
+require 'controller/fake_models'
+
+class ResponderTest < ActionController::TestCase
+  def test_class_level_respond_to
+    e = assert_raises(NoMethodError) do
+      Class.new(ActionController::Base) do
+        respond_to :json
+      end
+    end
+
+    assert_includes e.message, '`responder` gem'
+  end
+
+  def test_respond_with
+    klass = Class.new(ActionController::Base) do
+      def index
+        respond_with Customer.new("david", 13)
+      end
+    end
+
+    @controller = klass.new
+
+    e = assert_raises(NoMethodError) do
+      get :index
+    end
+
+    assert_includes e.message, '`responder` gem'
+  end
+end