1 files changed, 15 insertions, 0 deletions
diff --git a/testing/web-platform/tests/client-hints/critical-ch/resources/util.js b/testing/web-platform/tests/client-hints/critical-ch/resources/util.js
new file mode 100644
index 0000000000..7471d9022e
--- /dev/null
+++ b/testing/web-platform/tests/client-hints/critical-ch/resources/util.js
@@ -0,0 +1,15 @@
+ECHO_URL = "resources/echo-critical-hint.py"
+
+message_listener = (t, message) =>
+  (e) => {
+    t.step(()=>{assert_equals(e.data, message)});
+    t.done();
+  }
+
+make_message_test = (url, message) =>
+  (t) => {
+    popup_window = window.open("/common/blank.html");
+    assert_not_equals(popup_window, null, "Popup windows not allowed?");
+    popup_window.addEventListener('message', message_listener(t, message));
+    popup_window.location = url;
+  }