fix: blank strings are equal

Author: UziTech

lib/index.js

@@ -58,6 +58,10 @@ export class HtmlDiffer {
    * @returns {Boolean}
    */
   async isEqual(html1, html2) {
+    if (html1 === html2) {
+      return true;
+    }
+
     const diff = await this.diffHtml(html1, html2);
 
     return (diff.length === 1 && !diff[0].added && !diff[0].removed);

test/differ/isEqual.js

@@ -180,4 +180,11 @@ describe('\'isEqual\'', function() {
 
     invalidPreset.must.throw(Error);
   });
+
+  it('blank values are equal', async function() {
+    const htmlDiffer = new HtmlDiffer();
+    const isEqual = await htmlDiffer.isEqual('', '');
+
+    isEqual.must.be.true();
+  });
 });