Add test

Author: sy-records

test/integration/render.test.js

@@ -118,6 +118,16 @@ describe('render', function() {
       );
     });
 
+    test('loading', async function() {
+      const output = window.marked(
+        "![alt text](http://imageUrl ':loading=lazy')"
+      );
+
+      expect(output).toMatchInlineSnapshot(
+        `"<p><img src=\\"http://imageUrl\\" data-origin=\\"http://imageUrl\\" alt=\\"alt text\\" loading=\\"lazy\\" /></p>"`
+      );
+    });
+
     test('id', async function() {
       const output = window.marked(
         "![alt text](http://imageUrl ':id=someCssID')"