--- /dev/null
+/* Copyright (c) 2015, Google Inc.
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
+ * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
+ * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
+ * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */
+
+#include "internal.h"
+
+#include <gtest/gtest.h>
+
+
+TEST(RefCountTest, Basic) {
+ CRYPTO_refcount_t count = 0;
+
+ CRYPTO_refcount_inc(&count);
+ EXPECT_EQ(1u, count);
+
+ EXPECT_TRUE(CRYPTO_refcount_dec_and_test_zero(&count));
+ EXPECT_EQ(0u, count);
+
+ count = CRYPTO_REFCOUNT_MAX;
+ CRYPTO_refcount_inc(&count);
+ EXPECT_EQ(CRYPTO_REFCOUNT_MAX, count)
+ << "Count did not saturate correctly when incrementing.";
+ EXPECT_FALSE(CRYPTO_refcount_dec_and_test_zero(&count));
+ EXPECT_EQ(CRYPTO_REFCOUNT_MAX, count)
+ << "Count did not saturate correctly when decrementing.";
+
+ count = 2;
+ EXPECT_FALSE(CRYPTO_refcount_dec_and_test_zero(&count));
+ EXPECT_EQ(1u, count);
+}