Tests: Modularize unit testing

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

src/unittest/test_socket.cpp

@@ -0,0 +1,151 @@
+/*
+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 "log.h"
+#include "socket.h"
+#include "settings.h"
+
+class TestSocket : public TestBase {
+public:
+	TestSocket()
+	{
+		if (INTERNET_SIMULATOR == false)
+			TestManager::registerTestModule(this);
+	}
+
+	const char *getName() { return "TestSocket"; }
+
+	void runTests(IGameDef *gamedef);
+
+	void testIPv4Socket();
+	void testIPv6Socket();
+
+	static const int port = 30003;
+};
+
+static TestSocket g_test_instance;
+
+void TestSocket::runTests(IGameDef *gamedef)
+{
+	TEST(testIPv4Socket);
+
+	if (g_settings->getBool("enable_ipv6"))
+		TEST(testIPv6Socket);
+}
+
+////////////////////////////////////////////////////////////////////////////////
+
+void TestSocket::testIPv4Socket()
+{
+	Address address(0, 0, 0, 0, port);
+	Address bind_addr(0, 0, 0, 0, port);
+
+	/*
+	 * Try to use the bind_address for servers with no localhost address
+	 * For example: FreeBSD jails
+	 */
+	std::string bind_str = g_settings->get("bind_address");
+	try {
+		bind_addr.Resolve(bind_str.c_str());
+
+		if (!bind_addr.isIPv6()) {
+			address = bind_addr;
+		}
+	} catch (ResolveError &e) {
+	}
+
+	UDPSocket socket(false);
+	socket.Bind(address);
+
+	const char sendbuffer[] = "hello world!";
+	/*
+	 * If there is a bind address, use it.
+	 * It's useful in container environments
+	 */
+	if (address != Address(0, 0, 0, 0, port))
+		socket.Send(address, sendbuffer, sizeof(sendbuffer));
+	else
+		socket.Send(Address(127, 0, 0, 1, port), sendbuffer, sizeof(sendbuffer));
+
+	sleep_ms(50);
+
+	char rcvbuffer[256] = { 0 };
+	Address sender;
+	for (;;) {
+		if (socket.Receive(sender, rcvbuffer, sizeof(rcvbuffer)) < 0)
+			break;
+	}
+	//FIXME: This fails on some systems
+	UASSERT(strncmp(sendbuffer, rcvbuffer, sizeof(sendbuffer)) == 0);
+
+	if (address != Address(0, 0, 0, 0, port)) {
+		UASSERT(sender.getAddress().sin_addr.s_addr ==
+				address.getAddress().sin_addr.s_addr);
+	} else {
+		UASSERT(sender.getAddress().sin_addr.s_addr ==
+				Address(127, 0, 0, 1, 0).getAddress().sin_addr.s_addr);
+	}
+}
+
+void TestSocket::testIPv6Socket()
+{
+	Address address6((IPv6AddressBytes *)NULL, port);
+	UDPSocket socket6;
+
+	if (!socket6.init(true, true)) {
+		/* Note: Failing to create an IPv6 socket is not technically an
+		   error because the OS may not support IPv6 or it may
+		   have been disabled. IPv6 is not /required/ by
+		   minetest and therefore this should not cause the unit
+		   test to fail
+		*/
+		dstream << "WARNING: IPv6 socket creation failed (unit test)"
+			<< std::endl;
+		return;
+	}
+
+	const char sendbuffer[] = "hello world!";
+	IPv6AddressBytes bytes;
+	bytes.bytes[15] = 1;
+
+	socket6.Bind(address6);
+
+	try {
+		socket6.Send(Address(&bytes, port), sendbuffer, sizeof(sendbuffer));
+
+		sleep_ms(50);
+
+		char rcvbuffer[256] = { 0 };
+		Address sender;
+
+		for(;;) {
+			if (socket6.Receive(sender, rcvbuffer, sizeof(rcvbuffer)) < 0)
+				break;
+		}
+		//FIXME: This fails on some systems
+		UASSERT(strncmp(sendbuffer, rcvbuffer, sizeof(sendbuffer)) == 0);
+		UASSERT(memcmp(sender.getAddress6().sin6_addr.s6_addr,
+				Address(&bytes, 0).getAddress6().sin6_addr.s6_addr, 16) == 0);
+	} catch (SendFailedException &e) {
+		errorstream << "IPv6 support enabled but not available!"
+					<< std::endl;
+	}
+}