1 files changed, 37 insertions, 0 deletions
diff --git a/js/src/tests/test262/harness/promiseHelper.js b/js/src/tests/test262/harness/promiseHelper.js
new file mode 100644
index 0000000000..cc9d2323d1
--- /dev/null
+++ b/js/src/tests/test262/harness/promiseHelper.js
@@ -0,0 +1,37 @@
+// Copyright (c) 2017 Rick Waldron.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+description: >
+    Including promiseHelper.js will expose a function:
+
+        checkSequence
+
+    To ensure execution order of some async chain, checkSequence accepts an array
+    of numbers, each added during some operation, and verifies that they
+    are in numeric order.
+
+includes: [promiseHelper.js]
+---*/
+
+assert(checkSequence([1, 2, 3, 4, 5]));
+
+var threw = false;
+
+try {
+  checkSequence([2, 1, 3, 4, 5]);
+} catch(err) {
+  threw = true;
+  if (err.constructor !== Test262Error) {
+    throw new Error(
+      'Expected a Test262Error, but a "' + err.constructor.name +
+      '" was thrown.'
+    );
+  }
+}
+
+if (threw === false) {
+  throw new Error('Expected a Test262Error, but no error was thrown.');
+}
+
+
+reportCompare(0, 0);