fix(manipulator): increase coverage for manipulator

js/tests/karma.conf.js

@@ -140,6 +140,16 @@ if (bundle) {
         branches: 86,
         functions: 89,
         lines: 90
+      },
+      each: {
+        overrides: {
+          'js/src/dom/polyfill.js': {
+            statements: 39,
+            lines: 37,
+            branches: 19,
+            functions: 50
+          }
+        }
       }
     }
   }