diff --git a/test/cctest/test-mementos.cc b/test/cctest/test-mementos.cc
new file mode 100644
index 0000000..4c85151
--- /dev/null
+++ b/test/cctest/test-mementos.cc
@@ -0,0 +1,121 @@
+// Copyright 2014 the V8 project authors. All rights reserved.
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+//       notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+//       copyright notice, this list of conditions and the following
+//       disclaimer in the documentation and/or other materials provided
+//       with the distribution.
+//     * Neither the name of Google Inc. nor the names of its
+//       contributors may be used to endorse or promote products derived
+//       from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#include "test/cctest/cctest.h"
+
+using namespace v8::internal;
+
+
+static void SetUpNewSpaceWithPoisonedMementoAtTop() {
+  Isolate* isolate = CcTest::i_isolate();
+  Heap* heap = isolate->heap();
+  NewSpace* new_space = heap->new_space();
+
+  // Make sure we can allocate some objects without causing a GC later.
+  heap->CollectAllGarbage(Heap::kAbortIncrementalMarkingMask);
+
+  // Allocate a string, the GC may suspect a memento behind the string.
+  Handle<SeqOneByteString> string =
+      isolate->factory()->NewRawOneByteString(12).ToHandleChecked();
+  CHECK(*string);
+
+  // Create an allocation memento behind the string with a garbage allocation
+  // site pointer.
+  AllocationMemento* memento =
+      reinterpret_cast<AllocationMemento*>(new_space->top() + kHeapObjectTag);
+  memento->set_map_no_write_barrier(heap->allocation_memento_map());
+  memento->set_allocation_site(
+      reinterpret_cast<AllocationSite*>(kHeapObjectTag), SKIP_WRITE_BARRIER);
+}
+
+
+TEST(Regress340063) {
+  CcTest::InitializeVM();
+  if (!i::FLAG_allocation_site_pretenuring) return;
+  v8::HandleScope scope(CcTest::isolate());
+
+
+  SetUpNewSpaceWithPoisonedMementoAtTop();
+
+  // Call GC to see if we can handle a poisonous memento right after the
+  // current new space top pointer.
+  CcTest::i_isolate()->heap()->CollectAllGarbage(
+      Heap::kAbortIncrementalMarkingMask);
+}
+
+
+TEST(BadMementoAfterTopForceScavenge) {
+  CcTest::InitializeVM();
+  if (!i::FLAG_allocation_site_pretenuring) return;
+  v8::HandleScope scope(CcTest::isolate());
+
+  SetUpNewSpaceWithPoisonedMementoAtTop();
+
+  // Force GC to test the poisoned memento handling
+  CcTest::i_isolate()->heap()->CollectGarbage(i::NEW_SPACE);
+}
+
+
+TEST(PretenuringCallNew) {
+  CcTest::InitializeVM();
+  if (!i::FLAG_allocation_site_pretenuring) return;
+  if (!i::FLAG_pretenuring_call_new) return;
+
+  v8::HandleScope scope(CcTest::isolate());
+  Isolate* isolate = CcTest::i_isolate();
+  Heap* heap = isolate->heap();
+
+  int call_count = 10;
+  i::ScopedVector<char> test_buf(1024);
+  const char* program =
+      "function f() {"
+      "  this.a = 3;"
+      "  this.b = {};"
+      "  return this;"
+      "};"
+      "var a;"
+      "for(var i = 0; i < %d; i++) {"
+      "  a = new f();"
+      "}"
+      "a;";
+  i::SNPrintF(test_buf, program, call_count);
+  v8::Local<v8::Value> res = CompileRun(test_buf.start());
+  Handle<JSObject> o =
+      v8::Utils::OpenHandle(*v8::Handle<v8::Object>::Cast(res));
+
+  // The object of class f should have a memento secreted behind it.
+  Address memento_address = o->address() + o->map()->instance_size();
+  AllocationMemento* memento =
+      reinterpret_cast<AllocationMemento*>(memento_address + kHeapObjectTag);
+  CHECK_EQ(memento->map(), heap->allocation_memento_map());
+
+  // Furthermore, how many mementos did we create? The count should match
+  // call_count. Note, that mementos are allocated during the inobject slack
+  // tracking phase.
+  AllocationSite* site = memento->GetAllocationSite();
+  CHECK_EQ(call_count, site->pretenure_create_count()->value());
+}