1 files changed, 62 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/Promise/race/resolve-from-same-thenable.js b/js/src/tests/test262/built-ins/Promise/race/resolve-from-same-thenable.js
new file mode 100644
index 0000000000..df4a3c4daf
--- /dev/null
+++ b/js/src/tests/test262/built-ins/Promise/race/resolve-from-same-thenable.js
@@ -0,0 +1,62 @@
+// Copyright (C) 2020 Rick Waldron. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-performpromiserace
+description: >
+  Promise.race does not prevent resolve from being called multiple times.
+info: |
+  PerformPromiseRace
+
+  Repeat,
+    Let next be IteratorStep(iteratorRecord).
+    If next is an abrupt completion, set iteratorRecord.[[Done]] to true.
+    ReturnIfAbrupt(next).
+    If next is false, then
+      Set iteratorRecord.[[Done]] to true.
+      Return resultCapability.[[Promise]].
+    Let nextValue be IteratorValue(next).
+    If nextValue is an abrupt completion, set iteratorRecord.[[Done]] to true.
+    ReturnIfAbrupt(nextValue).
+    Let nextPromise be ? Call(promiseResolve, constructor, « nextValue »).
+    Perform ? Invoke(nextPromise, "then", « resultCapability.[[Resolve]], resultCapability.[[Reject]] »).
+
+includes: [promiseHelper.js]
+---*/
+
+let callCount = 0;
+let sequence = [];
+
+function Constructor(executor) {
+  function resolve(value) {
+    callCount += 1;
+    sequence.push(value);
+  }
+  executor(resolve, Test262Error.thrower);
+}
+Constructor.resolve = function(v) {
+  return v;
+};
+
+let pResolve;
+let a = {
+  then(resolver, rejector) {
+    pResolve = resolver;
+  }
+};
+
+assert.sameValue(callCount, 0, 'callCount before call to race()');
+
+Promise.race.call(Constructor, [a]);
+
+assert.sameValue(callCount, 0, 'callCount after call to race()');
+
+pResolve(1);
+pResolve(2);
+pResolve(3);
+
+assert.sameValue(callCount, 3, 'callCount after resolving a');
+assert.sameValue(sequence.length, 3);
+checkSequence(sequence);
+
+reportCompare(0, 0);