1 files changed, 36 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/Iterator/prototype/map/return-is-forwarded-to-underlying-iterator.js b/js/src/tests/test262/built-ins/Iterator/prototype/map/return-is-forwarded-to-underlying-iterator.js
new file mode 100644
index 0000000000..3e1cab2d40
--- /dev/null
+++ b/js/src/tests/test262/built-ins/Iterator/prototype/map/return-is-forwarded-to-underlying-iterator.js
@@ -0,0 +1,36 @@
+// |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.map
+description: >
+  Underlying iterator return is called when result iterator is closed
+info: |
+  %Iterator.prototype%.map ( mapper )
+
+features: [iterator-helpers]
+flags: []
+---*/
+let returnCount = 0;
+
+class TestIterator extends Iterator {
+  next() {
+    return {
+      done: false,
+      value: 1,
+    };
+  }
+  return() {
+    ++returnCount;
+    return {};
+  }
+}
+
+let iterator = new TestIterator().map(() => 0);
+assert.sameValue(returnCount, 0);
+iterator.return();
+assert.sameValue(returnCount, 1);
+iterator.return();
+assert.sameValue(returnCount, 1);
+
+reportCompare(0, 0);