So siehts ganz gut aus !

node_modules/pug/test/duplicate-block/index.test.js

@@ -0,0 +1,14 @@
+const pug = require('../../');
+
+test('layout with duplicate block', () => {
+  const outputWithAjax = pug.renderFile(
+    __dirname + '/index.pug',
+    {ajax: true}
+  );
+  const outputWithoutAjax = pug.renderFile(
+    __dirname + '/index.pug',
+    {ajax: false}
+  );
+  expect(outputWithAjax).toMatchSnapshot();
+  expect(outputWithoutAjax).toMatchSnapshot();
+});