add a benchmark integration test for performing handshakes

integrationtests/self/benchmark_test.go

@@ -0,0 +1,45 @@
+package self_test
+
+import (
+	"context"
+	"net"
+	"testing"
+
+	"github.com/quic-go/quic-go"
+)
+
+func BenchmarkHandshake(b *testing.B) {
+	b.ReportAllocs()
+
+	ln, err := quic.ListenAddr("localhost:0", tlsConfig, nil)
+	if err != nil {
+		b.Fatal(err)
+	}
+	defer ln.Close()
+
+	connChan := make(chan quic.Connection, 1)
+	go func() {
+		for {
+			conn, err := ln.Accept(context.Background())
+			if err != nil {
+				return
+			}
+			connChan <- conn
+		}
+	}()
+
+	conn, err := net.ListenUDP("udp", nil)
+	if err != nil {
+		b.Fatal(err)
+	}
+
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		c, err := quic.Dial(conn, ln.Addr(), "localhost", tlsClientConfig, nil)
+		if err != nil {
+			b.Fatal(err)
+		}
+		<-connChan
+		c.CloseWithError(0, "")
+	}
+}