Add test verifying that iterator helpers do not close non-object receivers.

Author: woess

graal-js/src/com.oracle.truffle.js.test/js/GR-63039.js

@@ -0,0 +1,47 @@
+/*
+ * Copyright (c) 2025, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * Licensed under the Universal Permissive License v 1.0 as shown at http://oss.oracle.com/licenses/upl.
+ */
+
+/**
+ * Iterator helpers should only close the receiver if it is an Object.
+ *
+ * @option iterator-helpers
+ */
+
+load("./assert.js")
+
+let returnCalled = 0;
+Number.prototype.return = function() { returnCalled++ };
+
+for (const iteratorMethod of [
+    Iterator.prototype.drop,
+    Iterator.prototype.take,
+]) {
+    returnCalled = 0;
+    assertThrows(() => iteratorMethod.call(42), TypeError, "not an Object");
+    assertSame(0, returnCalled);
+    assertThrows(() => iteratorMethod.call(new Number(42)), RangeError);
+    assertSame(1, returnCalled);
+}
+
+for (const iteratorMethod of [
+    Iterator.prototype.filter,
+    Iterator.prototype.map,
+    Iterator.prototype.flatMap,
+    Iterator.prototype.reduce,
+    Iterator.prototype.find,
+    Iterator.prototype.some,
+    Iterator.prototype.every,
+    Iterator.prototype.forEach,
+]) {
+    returnCalled = 0;
+    assertThrows(() => iteratorMethod.call(42, function() {}), TypeError, "not an Object");
+    assertSame(0, returnCalled);
+    assertThrows(() => iteratorMethod.call(42), TypeError, "not an Object");
+    assertSame(0, returnCalled);
+    assertThrows(() => iteratorMethod.call(new Number(42)), TypeError, "not a function");
+    assertSame(1, returnCalled);
+}