Add test to ensure client-side parser works with DOMParser

Confirm that for the client parser, if the first HTML element has
attributes, it should properly match only the tag name and no
longer throw an error.

Issue #23

Author: remarkablemark

test/html-to-dom.js

@@ -55,9 +55,35 @@ describe('html-to-dom', function() {
                 data.html.comment +
                 data.html.script
             );
-            helpers.deepEqualCircular(htmlToDOMClient(html), htmlToDOMServer(html));
+
+            helpers.deepEqualCircular(
+                htmlToDOMClient(html),
+                htmlToDOMServer(html)
+            );
         });
 
+        it('works with `window.DOMParser`', function() {
+            var html = (
+                data.html.attributes +
+                data.html.nested +
+                data.html.comment +
+                data.html.script
+            );
+
+            // mock `window.DOMParser`
+            // https://developer.mozilla.org/en-US/docs/Web/API/DOMParser
+            window.DOMParser = function() {
+                this.parseFromString = function(html) {
+                    jsdomify.create(html);
+                    return document;
+                };
+            };
+
+            helpers.deepEqualCircular(
+                htmlToDOMClient(html),
+                htmlToDOMServer(html)
+            );
+        });
     });
 
 });