test(cases): add additional script and style test cases to html

Test empty script and style tag and script with json

test/cases/html.js

@@ -182,12 +182,24 @@ module.exports = [
   },
 
   // script tag
+  {
+    name: 'empty script',
+    data: '<script></script>'
+  },
   {
     name: 'script',
     data: '<script>console.log(1 < 2);</script>'
   },
+  {
+    name: 'script with json',
+    data: '<script type="application/json">{"foo":"bar"}</script>'
+  },
 
   // style tag
+  {
+    name: 'empty style',
+    data: '<style></style>'
+  },
   {
     name: 'style',
     data: '<style>body > .foo { color: #f00; }</style>'