Implemented the real server

server/tests/NetworkProtocolTests.cpp

@@ -0,0 +1,47 @@
+#include "game_server/NetworkProtocol.h"
+#include <cstdlib>
+#include <iostream>
+#include <string>
+
+namespace {
+
+void require(bool condition, const char* message)
+{
+	if (condition) return;
+	std::cerr << "NetworkProtocolTests: " << message << '\n';
+	std::exit(EXIT_FAILURE);
+}
+
+} // namespace
+
+int main()
+{
+	const nlohmann::json original{
+		{"schemaVersion", 1},
+		{"campaignId", "battle_zone"},
+		{"players", {{"player", {{"hp", 200.0}}}}}
+	};
+	const std::string message = FRG::makeStateMessage(original);
+	nlohmann::json parsed;
+	std::string error;
+	require(
+		FRG::parseStateMessage(message, parsed, error),
+		"valid state envelope was rejected");
+	require(parsed == original, "state payload did not round trip");
+
+	require(
+		!FRG::parseStateMessage(
+			R"({"protocolVersion":2,"type":"state","payload":{}})",
+			parsed, error),
+		"unknown protocol version was accepted");
+	require(
+		!FRG::parseStateMessage(
+			R"({"protocolVersion":1,"type":"command","payload":{}})",
+			parsed, error),
+		"unknown message type was accepted");
+	require(
+		!FRG::parseStateMessage("not json", parsed, error),
+		"malformed JSON was accepted");
+
+	return EXIT_SUCCESS;
+}