diff --git a/src/yggdrasil/core_test.go b/src/yggdrasil/core_test.go
index 4b283d4d..5bca94ff 100644
--- a/src/yggdrasil/core_test.go
+++ b/src/yggdrasil/core_test.go
@@ -1,8 +1,11 @@
 package yggdrasil
 
 import (
+	"bytes"
+	"math/rand"
 	"os"
 	"testing"
+	"time"
 
 	"github.com/gologme/log"
 
@@ -27,7 +30,7 @@ func GetLoggerWithPrefix(prefix string) *log.Logger {
 	return l
 }
 
-func TestCore_Start(t *testing.T) {
+func CreateAndConnectTwo(t *testing.T) (*Core, *Core) {
 	nodeA := Core{}
 	_, err := nodeA.Start(GenerateConfig(), GetLoggerWithPrefix("A: "))
 	if err != nil {
@@ -44,4 +47,84 @@ func TestCore_Start(t *testing.T) {
 	if err != nil {
 		t.Fatal(err)
 	}
+
+	if l := len(nodeA.GetPeers()); l != 1 {
+		t.Fatal("unexpected number of peers", l)
+	}
+	if l := len(nodeB.GetPeers()); l != 1 {
+		t.Fatal("unexpected number of peers", l)
+	}
+
+	return &nodeA, &nodeB
+}
+
+func TestCore_Start_Connect(t *testing.T) {
+	CreateAndConnectTwo(t)
+}
+
+func TestCore_Start_Transfer(t *testing.T) {
+	nodeA, nodeB := CreateAndConnectTwo(t)
+
+	// Listen
+	listener, err := nodeA.ConnListen()
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer listener.Close()
+
+	done := make(chan struct{})
+	go func() {
+		conn, err := listener.Accept()
+		if err != nil {
+			t.Error(err)
+			return
+		}
+		defer conn.Close()
+		buf := make([]byte, 64)
+		n, err := conn.Read(buf)
+		if err != nil {
+			t.Error(err)
+			return
+		}
+		if n != 64 {
+			t.Error("missing data")
+			return
+		}
+		_, err = conn.Write(buf)
+		if err != nil {
+			t.Error(err)
+		}
+		done <- struct{}{}
+	}()
+
+	time.Sleep(3 * time.Second) // FIXME
+	// Dial
+	dialer, err := nodeB.ConnDialer()
+	if err != nil {
+		t.Fatal(err)
+	}
+	t.Log(nodeA.GetSwitchPeers())
+	t.Log(nodeB.GetSwitchPeers())
+	t.Log(nodeA.GetSessions())
+	t.Log(nodeB.GetSessions())
+	conn, err := dialer.Dial("nodeid", nodeA.NodeID().String())
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer conn.Close()
+	msg := make([]byte, 64)
+	rand.Read(msg)
+	conn.Write(msg)
+	if err != nil {
+		t.Fatal(err)
+	}
+	buf := make([]byte, 64)
+	_, err = conn.Read(buf)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if bytes.Compare(msg, buf) != 0 {
+		t.Fatal("expected echo")
+	}
+	<-done
 }