1 files changed, 10 insertions, 0 deletions
diff --git a/activerecord/test/cases/connection_adapters/connection_handlers_multi_db_test.rb b/activerecord/test/cases/connection_adapters/connection_handlers_multi_db_test.rb
index 79c2c4d827..0b3fb82e12 100644
--- a/activerecord/test/cases/connection_adapters/connection_handlers_multi_db_test.rb
+++ b/activerecord/test/cases/connection_adapters/connection_handlers_multi_db_test.rb
@@ -328,6 +328,16 @@ module ActiveRecord
       ensure
         ActiveRecord::Base.connection_handlers = original_handlers
       end
+
+      def test_calling_connected_to_on_a_non_existent_handler_raises
+        error = assert_raises ArgumentError do
+          ActiveRecord::Base.connected_to(role: :reading) do
+            yield
+          end
+        end
+
+        assert_equal "The reading role does not exist. Add it by establishing a connection with `connects_to` or use an existing role (writing).", error.message
+      end
     end
   end
 end