1 files changed, 24 insertions, 0 deletions
diff --git a/js/src/tests/test262/harness/asyncHelpers-asyncTest-without-async-flag.js b/js/src/tests/test262/harness/asyncHelpers-asyncTest-without-async-flag.js
new file mode 100644
index 0000000000..b7b0e4f733
--- /dev/null
+++ b/js/src/tests/test262/harness/asyncHelpers-asyncTest-without-async-flag.js
@@ -0,0 +1,24 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+description: |
+    The 'asyncTest' helper checks that it is called with the 'async' flag.
+includes: [asyncHelpers.js]
+---*/
+function makePromise() {
+  return {
+    then(res, rej) {
+      // Throw a different error than Test262Error to avoid confusion about what is rejecting
+      throw new Error("Should not be evaluated");
+    },
+  };
+}
+assert(
+  !Object.hasOwn(globalThis, "$DONE"),
+  "Without 'async' flag, $DONE should not be defined"
+);
+assert.throws(Test262Error, function () {
+  asyncTest(makePromise);
+});
+
+reportCompare(0, 0);