1 files changed, 32 insertions, 0 deletions
diff --git a/js/src/tests/test262/harness/asyncHelpers-asyncTest-return-not-thenable.js b/js/src/tests/test262/harness/asyncHelpers-asyncTest-return-not-thenable.js
new file mode 100644
index 0000000000..f752faa992
--- /dev/null
+++ b/js/src/tests/test262/harness/asyncHelpers-asyncTest-return-not-thenable.js
@@ -0,0 +1,32 @@
+// 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 rejects test functions that do not return a thenable.
+includes: [asyncHelpers.js, compareArray.js]
+---*/
+
+const doneValues = [];
+function $DONE(error) {
+  // Will be a TypeError from trying to invoke .then() on non-thenable
+  doneValues.push(error instanceof TypeError);
+}
+asyncTest(function () {
+  return null;
+});
+asyncTest(function () {
+  return {};
+});
+asyncTest(function () {
+  return "string";
+});
+asyncTest(function () {
+  return 42;
+});
+asyncTest(function () {});
+asyncTest(function () {
+  return function () {};
+});
+assert.compareArray(doneValues, [true, true, true, true, true, true]);
+
+reportCompare(0, 0);