1 files changed, 39 insertions, 0 deletions
diff --git a/deps/v8/test/mjsunit/harmony/weakrefs/clear-called-twice.js b/deps/v8/test/mjsunit/harmony/weakrefs/clear-called-twice.js
new file mode 100644
index 0000000000..a5aa537ff2
--- /dev/null
+++ b/deps/v8/test/mjsunit/harmony/weakrefs/clear-called-twice.js
@@ -0,0 +1,39 @@
+// 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_call_count = 0;
+let cleanup = function(iter) {
+  ++cleanup_call_count;
+}
+
+let wf = new WeakFactory(cleanup);
+// Create an object and a WeakCell pointing to it. The object needs to be inside
+// a closure so that we can reliably kill them!
+let weak_cell;
+
+(function() {
+  let object = {};
+  weak_cell = wf.makeCell(object);
+
+  // Clear the WeakCell before the GC has a chance to discover it.
+  weak_cell.clear();
+
+  // Call clear again (just to assert we handle this gracefully).
+  weak_cell.clear();
+
+  // object goes out of scope.
+})();
+
+// This GC will discover dirty WeakCells.
+gc();
+assertEquals(0, cleanup_call_count);
+
+// Assert that the cleanup function won't be called, since the WeakCell was cleared.
+let timeout_func = function() {
+  assertEquals(0, cleanup_call_count);
+}
+
+setTimeout(timeout_func, 0);