[1704] Add some tests for InterprocessSyncNull class too

src/lib/util/tests/Makefile.am

@@ -29,6 +29,7 @@ run_unittests_SOURCES += hex_unittest.cc
 run_unittests_SOURCES += io_utilities_unittest.cc
 run_unittests_SOURCES += lru_list_unittest.cc
 run_unittests_SOURCES += interprocess_sync_file_unittest.cc
+run_unittests_SOURCES += interprocess_sync_null_unittest.cc
 run_unittests_SOURCES += qid_gen_unittest.cc
 run_unittests_SOURCES += random_number_generator_unittest.cc
 run_unittests_SOURCES += sha1_unittest.cc

src/lib/util/tests/interprocess_sync_null_unittest.cc

@@ -0,0 +1,61 @@
+// Copyright (C) 2012  Internet Systems Consortium, Inc. ("ISC")
+//
+// 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 ISC DISCLAIMS ALL WARRANTIES WITH
+// REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+// AND FITNESS.  IN NO EVENT SHALL ISC 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 "util/interprocess_sync_null.h"
+#include <gtest/gtest.h>
+
+using namespace std;
+
+namespace isc {
+namespace util {
+
+TEST(InterprocessSyncNullTest, TestNull) {
+  InterprocessSyncNull sync("test1");
+  InterprocessSyncLocker locker(sync);
+
+  // All of these must always return true
+
+  EXPECT_TRUE(locker.lock());
+  EXPECT_TRUE(locker.lock());
+  EXPECT_TRUE(locker.lock());
+  EXPECT_TRUE(locker.lock());
+  EXPECT_TRUE(locker.lock());
+
+  EXPECT_TRUE(locker.unlock());
+  EXPECT_TRUE(locker.unlock());
+  EXPECT_TRUE(locker.unlock());
+  EXPECT_TRUE(locker.unlock());
+  EXPECT_TRUE(locker.unlock());
+
+  EXPECT_TRUE(locker.tryLock());
+  EXPECT_TRUE(locker.tryLock());
+  EXPECT_TRUE(locker.tryLock());
+  EXPECT_TRUE(locker.tryLock());
+  EXPECT_TRUE(locker.tryLock());
+
+  // Random order
+
+  EXPECT_TRUE(locker.unlock());
+  EXPECT_TRUE(locker.lock());
+  EXPECT_TRUE(locker.tryLock());
+  EXPECT_TRUE(locker.lock());
+  EXPECT_TRUE(locker.unlock());
+  EXPECT_TRUE(locker.lock());
+  EXPECT_TRUE(locker.tryLock());
+  EXPECT_TRUE(locker.unlock());
+  EXPECT_TRUE(locker.unlock());
+}
+
+} // namespace util
+} // namespace isc