net/nettest: make nettest.NewConn pass x/net/nettest.TestConn.

Signed-off-by: Maisem Ali <maisem@tailscale.com>

net/nettest/conn_test.go

@@ -0,0 +1,22 @@
+// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package nettest
+
+import (
+	"net"
+	"testing"
+
+	"golang.org/x/net/nettest"
+)
+
+func TestConn(t *testing.T) {
+	nettest.TestConn(t, func() (c1 net.Conn, c2 net.Conn, stop func(), err error) {
+		c1, c2 = NewConn("test", bufferSize)
+		return c1, c2, func() {
+			c1.Close()
+			c2.Close()
+		}, nil
+	})
+}