1 files changed, 32 insertions, 0 deletions
diff --git a/deps/v8/test/mjsunit/harmony/weakrefs/cleanupsome.js b/deps/v8/test/mjsunit/harmony/weakrefs/cleanupsome.js
new file mode 100644
index 0000000000..1d3ceda3f2
--- /dev/null
+++ b/deps/v8/test/mjsunit/harmony/weakrefs/cleanupsome.js
@@ -0,0 +1,32 @@
+// 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
+
+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");
+
+  // cleanupSome won't do anything since there are no reclaimed targets.
+  fg.cleanupSome();
+  assertEquals(0, cleanup_count);
+})();
+
+// GC will detect o as dead.
+gc();
+
+fg.cleanupSome();
+assertEquals(1, cleanup_count);
+assertEquals(1, cleanup_holdings.length);
+assertEquals("holdings", cleanup_holdings[0]);