diff --git a/test/unit/common_test.rb b/test/unit/common_test.rb
index 43db724b..9ea016cf 100644
--- a/test/unit/common_test.rb
+++ b/test/unit/common_test.rb
@@ -208,7 +208,8 @@ def test_add_appium_prefix_already_have_appium_prefix
             'nestedKey2' => 2
           }
         }
-        assert_equal expected, caps_with_appium.as_json  # for testing
+        # for testing
+        assert_equal expected, caps_with_appium.as_json
       end
 
       def test_add_appium_prefix_has_no_parameter