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diff --git a/base/atomic_unittest.cc b/base/atomic_unittest.cc
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+// Copyright 2008, Google Inc.
+// 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 "base/atomic.h"
+
+#include "base/lock.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+TEST(AtomicTest, Increment) {
+  int32 value = 38;
+  int32 new_value = base::AtomicIncrement(&value);
+  EXPECT_EQ(39, value);
+  EXPECT_EQ(39, new_value);
+}
+
+TEST(AtomicTest, Decrement) {
+  int32 value = 49;
+  int32 new_value = base::AtomicDecrement(&value);
+  EXPECT_EQ(48, value);
+  EXPECT_EQ(48, new_value);
+}
+
+TEST(AtomicTest, Swap) {
+  int32 value = 38;
+  int32 old_value = base::AtomicSwap(&value, 49);
+  EXPECT_EQ(49, value);
+  EXPECT_EQ(38, old_value);
+
+  // Now do another test.
+  value = 0;
+  old_value = base::AtomicSwap(&value, 1);
+  EXPECT_EQ(0, old_value);
+  old_value = base::AtomicSwap(&value, 1);
+  EXPECT_EQ(1, old_value);
+  old_value = base::AtomicSwap(&value, 1);
+  EXPECT_EQ(1, old_value);
+}