test to ensure that respond_to? delegates to arel

1 files changed, 19 insertions, 0 deletions

diff --git a/activerecord/test/cases/relations_test.rb b/activerecord/test/cases/relations_test.rb
index 02c8c60873..ac7b501bb7 100644
--- a/activerecord/test/cases/relations_test.rb
+++ b/activerecord/test/cases/relations_test.rb
@@ -192,6 +192,25 @@ class RelationTest < ActiveRecord::TestCase
     end
   end
 
+  def test_respond_to_delegates_to_relation
+    relation = Topic.scoped
+    fake_arel = Struct.new(:responds) {
+      def respond_to? method, access = false
+        responds << [method, access]
+      end
+    }.new []
+
+    relation.extend(Module.new { attr_accessor :arel })
+    relation.arel = fake_arel
+
+    relation.respond_to?(:matching_attributes)
+    assert_equal [:matching_attributes, false], fake_arel.responds.first
+
+    fake_arel.responds = []
+    relation.respond_to?(:matching_attributes, true)
+    assert_equal [:matching_attributes, true], fake_arel.responds.first
+  end
+
   def test_respond_to_dynamic_finders
     relation = Topic.scoped