add stackbasic test

internet/stackbasic_test.go

@@ -0,0 +1,71 @@
+package internet
+
+import (
+	"math/rand"
+	"net/netip"
+	"testing"
+)
+
+func TestBasicStack(t *testing.T) {
+	rng := rand.New(rand.NewSource(1))
+	var sbCl, sbSv StackBasic
+	var connCl, connSv TCPConn
+	setupClientServer(t, rng, &sbCl, &sbSv, &connCl, &connSv)
+	var buf [2048]byte
+	n, err := sbCl.Handle(buf[:])
+	if err != nil {
+		t.Fatal(err)
+	} else if n == 0 {
+		t.Fatal("expected data exchange")
+	}
+	err = sbSv.Recv(buf[:n])
+	if err != nil {
+		t.Fatal(err)
+	}
+}
+
+func setupClientServer(t *testing.T, rng *rand.Rand, client, server *StackBasic, connClient, connServer *TCPConn) {
+	bufsize := 2048
+	// Ensure buffer sizes are OK with reused buffers.
+	svip := netip.AddrPortFrom(netip.AddrFrom4([4]byte{192, 168, 1, 0}), 80)
+	clip := netip.AddrPortFrom(netip.AddrFrom4([4]byte{192, 168, 1, 1}), 1337)
+	server.SetAddr(svip.Addr())
+	client.SetAddr(clip.Addr())
+
+	err := connServer.Configure(&TCPConnConfig{
+		RxBuf:             make([]byte, bufsize),
+		TxBuf:             make([]byte, bufsize),
+		TxPacketQueueSize: 3,
+		Logger:            nil,
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+	err = connClient.Configure(&TCPConnConfig{
+		RxBuf:             make([]byte, bufsize),
+		TxBuf:             make([]byte, bufsize),
+		TxPacketQueueSize: 3,
+		Logger:            nil,
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	err = connServer.OpenListen(svip.Port(), 200)
+	if err != nil {
+		t.Fatal(err)
+	}
+	err = connClient.OpenActive(svip, clip.Port(), 100)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	err = server.RegisterTCPConn(connServer)
+	if err != nil {
+		t.Fatal(err)
+	}
+	err = client.RegisterTCPConn(connClient)
+	if err != nil {
+		t.Fatal(err)
+	}
+}