[tests] Fixed async launch TestConnection.Multiple

test/test_many_connections.cpp

@@ -79,8 +79,6 @@ class TestConnection
         std::uniform_int_distribution<short> dis(-128, 127);
         std::generate(m_buf.begin(), m_buf.end(), [dis, gen]() mutable { return (char)dis(gen); });
 
-        cout << "Generated: " << static_cast<int>(m_buf[0]) << ", " << static_cast<int>(m_buf[1]) << std::endl;
-
         ASSERT_NE(srt_listen(m_server_sock, NSOCK), -1);
     }
 
@@ -135,7 +133,7 @@ TEST_F(TestConnection, Multiple)
     const sockaddr_in lsa = m_sa;
     const sockaddr* psa = reinterpret_cast<const sockaddr*>(&lsa);
 
-    auto ex = std::async([this] { return AcceptLoop(); });
+    auto ex = std::async(std::launch::async, [this] { return AcceptLoop(); });
 
     cerr << "Opening " << NSOCK << " connections\n";
 
@@ -180,6 +178,7 @@ TEST_F(TestConnection, Multiple)
 
     cerr << "Synchronize with the accepting thread\n";
     ex.wait();
+    cerr << "Synchronization done\n";
 }