So siehts ganz gut aus !

node_modules/pug/test/extends-not-top-level/index.test.js

@@ -0,0 +1,19 @@
+const pug = require('../../');
+
+// regression test for #2404
+
+test('extends not top level should throw an error', () => {
+  expect(
+    () => pug.compileFile(
+      __dirname + '/index.pug'
+    )
+  ).toThrow('Declaration of template inheritance ("extends") should be the first thing in the file. There can only be one extends statement per file.');
+});
+
+test('duplicate extends should throw an error', () => {
+  expect(
+    () => pug.compileFile(
+      __dirname + '/duplicate.pug'
+    )
+  ).toThrow('Declaration of template inheritance ("extends") should be the first thing in the file. There can only be one extends statement per file.');
+});