Tests: Modularize unit testing

Split unit tests into separate files under src/unittest/
Give better unittest diagnostics
Clean up some code

src/unittest/test_nodedef.cpp

@@ -0,0 +1,66 @@
+/*
+Minetest
+Copyright (C) 2013 celeron55, Perttu Ahola <celeron55@gmail.com>
+
+This program 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 2.1 of the License, or
+(at your option) any later version.
+
+This program 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 a copy of the GNU Lesser General Public License along
+with this program; if not, write to the Free Software Foundation, Inc.,
+51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
+#include "test.h"
+
+#include <sstream>
+
+#include "gamedef.h"
+#include "nodedef.h"
+#include "network/networkprotocol.h"
+
+class TestNodeDef : public TestBase {
+public:
+	TestNodeDef() { TestManager::registerTestModule(this); }
+	const char *getName() { return "TestNodeDef"; }
+
+	void runTests(IGameDef *gamedef);
+
+	void testContentFeaturesSerialization();
+};
+
+static TestNodeDef g_test_instance;
+
+void TestNodeDef::runTests(IGameDef *gamedef)
+{
+	TEST(testContentFeaturesSerialization);
+}
+
+////////////////////////////////////////////////////////////////////////////////
+
+void TestNodeDef::testContentFeaturesSerialization()
+{
+	ContentFeatures f;
+
+	f.name = "default:stone";
+	for (int i = 0; i < 6; i++)
+		f.tiledef[i].name = "default_stone.png";
+	f.is_ground_content = true;
+
+	std::ostringstream os(std::ios::binary);
+	f.serialize(os, LATEST_PROTOCOL_VERSION);
+	//verbosestream<<"Test ContentFeatures size: "<<os.str().size()<<std::endl;
+
+	std::istringstream is(os.str(), std::ios::binary);
+	ContentFeatures f2;
+	f2.deSerialize(is);
+
+	UASSERT(f.walkable == f2.walkable);
+	UASSERT(f.node_box.type == f2.node_box.type);
+}