Improve table head for xml parser

src/dom_components/model/ComponentTableHead.js

@@ -1,22 +1,17 @@
 import ComponentTableBody from './ComponentTableBody';
+import { toLowerCase } from 'utils/mixins';
+
+const type = 'thead';
 
 export default ComponentTableBody.extend(
   {
     defaults: {
       ...ComponentTableBody.prototype.defaults,
-      type: 'thead',
-      tagName: 'thead'
+      type,
+      tagName: type
     }
   },
   {
-    isComponent(el) {
-      let result = '';
-
-      if (el.tagName == 'THEAD') {
-        result = { type: 'thead' };
-      }
-
-      return result;
-    }
+    isComponent: el => toLowerCase(el.tagName) === type
   }
 );

test/specs/dom_components/model/ComponentTypes.js

@@ -44,6 +44,10 @@ describe('Component Types', () => {
     expectedType('<table></table>', 'table', { skipHtml: 1 });
   });
 
+  test('<thead> is correctly recognized', () => {
+    expectedType('<thead></thead>', 'thead', { skipHtml: 1 });
+  });
+
   test('<tbody> is correctly recognized', () => {
     expectedType('<tbody></tbody>', 'tbody', { skipHtml: 1 });
   });