TestConnA can now be run over and over again

metadapta_test.go

@@ -31,6 +31,7 @@ func TestConnA(test *testing.T) {
 	// server
 	listener, err := net.Listen(network, addr)
 	if err != nil { test.Fatal(err) }
+	defer listener.Close()
 	go func() {
 		test.Log("SERVER listening")
 		conn, err := listener.Accept()