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diff --git a/deps/v8/test/mjsunit/harmony/weakrefs/cleanupsome-2.js b/deps/v8/test/mjsunit/harmony/weakrefs/cleanupsome-2.js
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+++ b/deps/v8/test/mjsunit/harmony/weakrefs/cleanupsome-2.js
@@ -0,0 +1,31 @@
+// Copyright 2018 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Flags: --harmony-weak-refs --expose-gc --noincremental-marking --allow-natives-syntax
+
+let cleanup_count = 0;
+let cleanup_holdings = [];
+let cleanup = function(iter) {
+ for (holdings of iter) {
+ cleanup_holdings.push(holdings);
+ }
+ ++cleanup_count;
+}
+
+let fg = new FinalizationGroup(cleanup);
+(function() {
+ let o = {};
+ fg.register(o, "holdings");
+
+ assertEquals(0, cleanup_count);
+})();
+
+// GC will detect o as dead.
+gc();
+
+// passing no callback, should trigger cleanup function
+fg.cleanupSome();
+assertEquals(1, cleanup_count);
+assertEquals(1, cleanup_holdings.length);
+assertEquals("holdings", cleanup_holdings[0]);