build: Reviving support for precompiled headers

This commit also includes an update of ./waf, which has several
improvements.  In particular, clang++ is now default compiler on OSX
platform.

This commit also includes reorganization of tests. All unit tests are
now under tests/unit-tests and integrated tests are under
tests/integrated.  This change allows small compilation optimization,
partially related to precompiled headers.

Change-Id: I4c171c04d18e9cb83e461264a35b9ed85ea4d50e
diff --git a/tests/unit-tests/transport/test-unix-transport.cpp b/tests/unit-tests/transport/test-unix-transport.cpp
new file mode 100644
index 0000000..6c20302
--- /dev/null
+++ b/tests/unit-tests/transport/test-unix-transport.cpp
@@ -0,0 +1,80 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
+/**
+ * Copyright (c) 2013-2014 Regents of the University of California.
+ *
+ * This file is part of ndn-cxx library (NDN C++ library with eXperimental eXtensions).
+ *
+ * ndn-cxx library is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU Lesser General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later version.
+ *
+ * ndn-cxx library 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 Lesser General Public License for more details.
+ *
+ * You should have received copies of the GNU General Public License and GNU Lesser
+ * General Public License along with ndn-cxx, e.g., in COPYING.md file.  If not, see
+ * <http://www.gnu.org/licenses/>.
+ *
+ * See AUTHORS.md for complete list of ndn-cxx authors and contributors.
+ */
+
+#include "transport/unix-transport.hpp"
+#include "util/config-file.hpp"
+
+#include "boost-test.hpp"
+
+namespace ndn {
+
+class UnixTransportFixture
+{
+public:
+  UnixTransportFixture()
+  {
+    m_HOME = std::getenv("HOME");
+  }
+
+  ~UnixTransportFixture()
+  {
+    setenv("HOME", m_HOME.c_str(), 1);
+    // std::cerr << "restoring home = " << m_HOME << std::endl;
+  }
+
+protected:
+  std::string m_HOME;
+};
+
+BOOST_FIXTURE_TEST_SUITE(TransportTestUnixTransport, UnixTransportFixture)
+
+BOOST_AUTO_TEST_CASE(TestGetDefaultSocketNameOk)
+{
+  setenv("HOME", "tests/unit-tests/transport/test-homes/ok", 1);
+
+  ConfigFile config;
+  BOOST_REQUIRE_EQUAL(UnixTransport::getDefaultSocketName(config), "/tmp/test/nfd.sock");
+}
+
+BOOST_AUTO_TEST_CASE(TestGetDefaultSocketNameMissingSocketMissingProtocol)
+{
+  setenv("HOME", "tests/unit-tests/transport/test-homes/missing-unix-socket-missing-protocol", 1);
+  ConfigFile config;
+  BOOST_REQUIRE_EQUAL(UnixTransport::getDefaultSocketName(config), "/var/run/nfd.sock");
+}
+
+BOOST_AUTO_TEST_CASE(TestGetDefaultSocketNameMissingSocketNdndProtocol)
+{
+  setenv("HOME", "tests/unit-tests/transport/test-homes/missing-unix-socket-with-ndnd-protocol", 1);
+  ConfigFile config;
+  BOOST_REQUIRE_EQUAL(UnixTransport::getDefaultSocketName(config), "/tmp/.ndnd.sock");
+}
+
+BOOST_AUTO_TEST_CASE(TestGetDefaultSocketNameMissingSocketWithProtocol)
+{
+  setenv("HOME", "tests/unit-tests/transport/test-homes/missing-unix-socket-with-protocol", 1);
+  ConfigFile config;
+  BOOST_REQUIRE_EQUAL(UnixTransport::getDefaultSocketName(config), "/var/run/nfd.sock");
+}
+
+BOOST_AUTO_TEST_SUITE_END()
+
+} // namespace ndn