1 files changed, 35 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/Iterator/prototype/reduce/this-plain-iterator.js b/js/src/tests/test262/built-ins/Iterator/prototype/reduce/this-plain-iterator.js
new file mode 100644
index 0000000000..ccd2da7c33
--- /dev/null
+++ b/js/src/tests/test262/built-ins/Iterator/prototype/reduce/this-plain-iterator.js
@@ -0,0 +1,35 @@
+// |reftest| shell-option(--enable-iterator-helpers) skip-if(!this.hasOwnProperty('Iterator')||!xulRuntime.shell) -- iterator-helpers is not enabled unconditionally, requires shell-options
+// Copyright (C) 2023 Michael Ficarra. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-iteratorprototype.reduce
+description: >
+  Iterator.prototype.reduce supports a this value that does not inherit from Iterator.prototype but implements the iterator protocol
+info: |
+  %Iterator.prototype%.reduce ( reducer )
+
+includes: [compareArray.js]
+features: [iterator-helpers]
+flags: []
+---*/
+let iter = {
+  get next() {
+    let count = 3;
+    return function () {
+      --count;
+      return count >= 0 ? { done: false, value: count } : { done: true, value: undefined };
+    };
+  },
+};
+
+let reducerCalls = 0;
+let result = Iterator.prototype.reduce.call(iter, function (memo, v) {
+  ++reducerCalls;
+  memo.push(v);
+  return memo;
+}, []);
+
+assert.compareArray(result, [2, 1, 0]);
+assert.sameValue(reducerCalls, 3);
+
+reportCompare(0, 0);