Complex struct encoding test

Signed-off-by: Santiago Pastorino <santiago@wyeworks.com>

activesupport/test/json/encoding_test.rb

@@ -215,6 +215,29 @@ def test_array_should_pass_encoding_options_to_children_in_to_json
     assert_equal(%([{"address":{"city":"London"}},{"address":{"city":"Paris"}}]), json)
   end
 
+  def test_struct_encoding
+    Struct.new('UserNameAndEmail', :name, :email)
+    Struct.new('UserNameAndDate', :name, :date)
+    Struct.new('Custom', :name, :sub)
+    user_email = Struct::UserNameAndEmail.new 'David', 'sample@example.com'
+    user_birthday = Struct::UserNameAndDate.new 'David', Date.new(2010, 01, 01)
+    custom = Struct::Custom.new 'David', user_birthday
+
+
+    json_strings = ""
+    json_string_and_date = ""
+    json_custom = ""
+
+    assert_nothing_raised do
+      json_strings = user_email.to_json
+      json_string_and_date = user_birthday.to_json
+      json_custom = custom.to_json
+    end
+
+    assert_equal %({"name":"David","email":"sample@example.com"}), json_strings
+    assert_equal %({"name":"David","date":"2010/01/01"}), json_string_and_date
+    assert_equal %({"sub":{"name":"David","date":"2010/01/01"},"name":"David"}), json_custom
+  end
 
   protected