Add prototype for EchoSCP unit test

tests/code/EchoSCP.cpp

@@ -0,0 +1,53 @@
+#define BOOST_TEST_MODULE EchoSCP
+#include <boost/test/unit_test.hpp>
+
+#include <cstdlib>
+#include <memory>
+#include <thread>
+
+#include <boost/asio.hpp>
+
+#include "dcmtkpp/Association.h"
+#include "dcmtkpp/EchoSCP.h"
+#include "dcmtkpp/SCPDispatcher.h"
+#include "dcmtkpp/message/CEchoRequest.h"
+#include "dcmtkpp/message/Response.h"
+
+dcmtkpp::Value::Integer echo(dcmtkpp::message::CEchoRequest const & request)
+{
+    return dcmtkpp::message::Response::Success;
+}
+
+void run_server()
+{
+    dcmtkpp::Association association;
+    association.receive_association(boost::asio::ip::tcp::v4(), 11113);
+
+    auto echo_scp = std::make_shared<dcmtkpp::EchoSCP>(association, echo);
+    dcmtkpp::SCPDispatcher dispatcher(association);
+    dispatcher.set_scp(dcmtkpp::message::Message::Command::C_ECHO_RQ, echo_scp);
+    dispatcher.dispatch();
+    try
+    {
+        dispatcher.dispatch();
+    }
+    catch(dcmtkpp::AssociationReleased const &)
+    {
+        // Do nothing
+    }
+}
+
+void run_client()
+{
+    system("echoscu localhost 11113");
+}
+
+BOOST_AUTO_TEST_CASE(EchoSCP)
+{
+    std::thread server(run_server);
+    usleep(100000);
+    std::thread client(run_client);
+
+    server.join();
+    client.join();
+}