Better error message for typos in assert_response argument.

This commit makes it really easy to debug errors due to typos like
"assert_response :succezz".

1 files changed, 8 insertions, 0 deletions

diff --git a/actionpack/test/assertions/response_assertions_test.rb b/actionpack/test/assertions/response_assertions_test.rb
index ca1d58765d..8eec98e916 100644
--- a/actionpack/test/assertions/response_assertions_test.rb
+++ b/actionpack/test/assertions/response_assertions_test.rb
@@ -50,6 +50,14 @@ module ActionDispatch
           assert_response :success
         }
       end
+
+      def test_assert_response_sym_typo
+        @response = FakeResponse.new 200
+
+        assert_raises(ArgumentError) {
+          assert_response :succezz
+        }
+      end
     end
   end
 end