diff --git a/internal/multiplex/frameSorter_test.go b/internal/multiplex/frameSorter_test.go
index cfceded..39c3b99 100644
--- a/internal/multiplex/frameSorter_test.go
+++ b/internal/multiplex/frameSorter_test.go
@@ -29,7 +29,7 @@ func TestRecvNewFrame(t *testing.T) {
 		var testSorted []uint32
 		for x := 0; x < len(set); x++ {
 			oct := make([]byte, 8)
-			stream.sortedBuf.Write(oct)
+			stream.sortedBuf.Read(oct)
 			//log.Print(p)
 			testSorted = append(testSorted, uint32(binary.BigEndian.Uint64(oct)))
 		}
diff --git a/internal/multiplex/obfs_test.go b/internal/multiplex/obfs_test.go
new file mode 100644
index 0000000..45ff213
--- /dev/null
+++ b/internal/multiplex/obfs_test.go
@@ -0,0 +1,35 @@
+package multiplex
+
+import (
+	"math/rand"
+	"reflect"
+	"testing"
+	"testing/quick"
+)
+
+func TestOobfs(t *testing.T) {
+	sessionKey := make([]byte, 32)
+	rand.Read(sessionKey)
+	obfuscator, err := GenerateObfs(0x01, sessionKey)
+	if err != nil {
+		t.Errorf("failed to generate obfuscator %v", err)
+	}
+
+	f := &Frame{}
+	_testFrame, _ := quick.Value(reflect.TypeOf(f), rand.New(rand.NewSource(42)))
+	testFrame := _testFrame.Interface().(*Frame)
+	obfsed, err := obfuscator.Obfs(testFrame)
+	if err != nil {
+		t.Error("failed to obfs ", err)
+	}
+
+	resultFrame, err := obfuscator.Deobfs(obfsed)
+	if err != nil {
+		t.Error("failed to deobfs ", err)
+	}
+	if !reflect.DeepEqual(testFrame, resultFrame) {
+		t.Error("expecting", testFrame,
+			"got", resultFrame)
+	}
+
+}