diff --git a/test/browser_entry_point.ts b/test/browser_entry_point.ts
index 03f899ac2..8b03f819c 100644
--- a/test/browser_entry_point.ts
+++ b/test/browser_entry_point.ts
@@ -12,10 +12,11 @@ import './browser/browser.spec';
 import './browser/define-property.spec';
 import './browser/element.spec';
 import './browser/FileReader.spec';
+// import './browser/geolocation.spec.manual';
 import './browser/HTMLImports.spec';
+import './browser/MutationObserver.spec';
 import './browser/registerElement.spec';
 import './browser/requestAnimationFrame.spec';
 import './browser/WebSocket.spec';
 import './browser/XMLHttpRequest.spec';
-// import './browser/geolocation.spec.manual';
 import './mocha-patch.spec';
\ No newline at end of file