Simplify how dialing and listening works

Also add support for bare TCP

metadapta_test.go

@@ -1,11 +1,11 @@
 package hopp
 
 import "io"
-import "net"
 import "bytes"
 import "errors"
 import "slices"
 import "testing"
+import "context"
 
 // some of these tests spawn goroutines that can signal a failure.
 // abide by the documentation for testing.T (https://pkg.go.dev/testing#T):
@@ -230,34 +230,31 @@ func clientServerEnvironment(test *testing.T, clientFunc func(conn Conn), server
 	addr := "localhost:7959"
 
 	// server
-	listener, err := net.Listen(network, addr)
-	if err != nil { test.Fatal(err) }
+	listener, err := Listen(network, addr, nil)
 	test.Cleanup(func() { listener.Close() })
 	go func() {
 		test.Log("SERVER listening")
 		conn, err := listener.Accept()
 		if err != nil { test.Error("SERVER", err); return }
+
 		defer conn.Close()
 		test.Cleanup(func() { conn.Close() })
-		a := AdaptA(conn, ServerSide)
-		test.Cleanup(func() { a.Close() })
-
-		serverFunc(a)
+		
+		serverFunc(conn)
 		test.Log("SERVER closing")
 	}()
 
 	// client
 	test.Log("CLIENT dialing")
-	conn, err := net.Dial(network, addr)
+	conn, err := Dial(context.Background(), network, addr, nil)
 	if err != nil { test.Fatal("CLIENT", err) }
+	test.Cleanup(func() { conn.Close() })
 	test.Log("CLIENT dialed")
-	a := AdaptA(conn, ClientSide)
-	test.Cleanup(func() { a.Close() })
 
-	clientFunc(a)
+	clientFunc(conn)
 	
 	test.Log("CLIENT waiting for connection close...")
-	trans, err := a.AcceptTrans()
+	trans, err := conn.AcceptTrans()
 	if !errors.Is(err, io.EOF) {
 		test.Error("CLIENT wrong error:", err)
 		test.Fatal("CLIENT trans:", trans)