1 files changed, 27 insertions, 0 deletions
diff --git a/testing/web-platform/tests/html/webappapis/scripting/processing-model-2/integration-with-the-javascript-job-queue/resources/promise-job-incumbent-incumbent.html b/testing/web-platform/tests/html/webappapis/scripting/processing-model-2/integration-with-the-javascript-job-queue/resources/promise-job-incumbent-incumbent.html
new file mode 100644
index 0000000000..57dd5dff10
--- /dev/null
+++ b/testing/web-platform/tests/html/webappapis/scripting/processing-model-2/integration-with-the-javascript-job-queue/resources/promise-job-incumbent-incumbent.html
@@ -0,0 +1,27 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Incumbent page used as a test helper</title>
+
+<iframe src="relevant/relevant.html" id="r"></iframe>
+<iframe src="current/current.html" id="c"></iframe>
+
+<script>
+  const relevant = document.querySelector("#r");
+  const current = document.querySelector("#c");
+
+  window.runWindowPostMessageVeryIndirectly = (...args) => {
+    return current.contentWindow.postMessage.call(relevant.contentWindow, ...args);
+  };
+
+  // This tests the backup incumbent settings object stack scenario, by avoiding putting user code on the stack.
+  window.runWindowPostMessageVeryIndirectlyWithNoUserCode = (promise, promiseMethod, ...args) => {
+    const runWindowPostMessage = current.contentWindow.postMessage.bind(relevant.contentWindow, ...args);
+    promise[promiseMethod](runWindowPostMessage);
+  };
+
+  window.resolveThenableThatRunsWindowPostMessageVeryIndirectlyWithNoUserCode = (...args) => {
+    Promise.resolve({
+      then: current.contentWindow.postMessage.bind(relevant.contentWindow, ...args)
+    });
+  };
+</script>