--- /dev/null	2020-08-11 11:43:50.052052324 +0200
+++ new/test/hotspot/gtest/gc/g1/test_g1OldGenAllocationTracker.cpp	2020-08-19 12:41:53.014808137 +0200
@@ -0,0 +1,38 @@
+/*
+ * Copyright (c) 2020, Amazon.com, Inc. or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+
+#include "precompiled.hpp"
+#include "gc/g1/g1OldGenAllocationTracker.hpp"
+#include "unittest.hpp"
+
+TEST_VM(G1OldGenAllocationTracker, simple) {
+  G1OldGenAllocationTracker alloc_tracker;
+  size_t old_bytes = 100;
+  size_t humongous_bytes = 200;
+  alloc_tracker.add_allocated_bytes_since_last_gc(old_bytes);
+  alloc_tracker.add_allocated_humongous_bytes_since_last_gc(humongous_bytes);
+  alloc_tracker.reset_after_gc((size_t)0);
+
+  EXPECT_EQ(alloc_tracker.last_period_old_gen_bytes(), old_bytes + humongous_bytes);
+}