diff --git a/tree_test.go b/tree_test.go
index 2de98a0..b178986 100644
--- a/tree_test.go
+++ b/tree_test.go
@@ -305,6 +305,76 @@ func TestGet(t *testing.T) {
 	c.Check(gettedValue, qt.DeepEquals, BigIntToBytes(bLen, big.NewInt(int64(7*2))))
 }
 
+func TestPackAndUnpackSiblings(t *testing.T) {
+	c := qt.New(t)
+
+	siblingsHex := []string{
+		"0000000000000000000000000000000000000000000000000000000000000000",
+		"0100000000000000000000000000000000000000000000000000000000000000",
+		"0200000000000000000000000000000000000000000000000000000000000000",
+		"0000000000000000000000000000000000000000000000000000000000000000",
+		"0000000000000000000000000000000000000000000000000000000000000000",
+		"0000000000000000000000000000000000000000000000000000000000000000",
+		"0300000000000000000000000000000000000000000000000000000000000000",
+		"0400000000000000000000000000000000000000000000000000000000000000",
+		"0000000000000000000000000000000000000000000000000000000000000000",
+		"0000000000000000000000000000000000000000000000000000000000000000",
+		"0500000000000000000000000000000000000000000000000000000000000000",
+	}
+	siblings := make([][]byte, len(siblingsHex))
+	var err error
+	for i := 0; i < len(siblingsHex); i++ {
+		siblings[i], err = hex.DecodeString(siblingsHex[i])
+		c.Assert(err, qt.IsNil)
+	}
+
+	packed, err := PackSiblings(HashFunctionPoseidon, siblings)
+	c.Assert(err, qt.IsNil)
+	c.Assert(hex.EncodeToString(packed), qt.Equals, "a6000200c604"+
+		"0100000000000000000000000000000000000000000000000000000000000000"+
+		"0200000000000000000000000000000000000000000000000000000000000000"+
+		"0300000000000000000000000000000000000000000000000000000000000000"+
+		"0400000000000000000000000000000000000000000000000000000000000000"+
+		"0500000000000000000000000000000000000000000000000000000000000000")
+
+	unpacked, err := UnpackSiblings(HashFunctionPoseidon, packed)
+	c.Assert(err, qt.IsNil)
+	c.Assert(unpacked, qt.DeepEquals, siblings)
+
+	// another test with other values
+	siblingsHex = []string{
+		"1ce165cb1124ed3a0a94b4e212aaf7e8079f49b2fbef916bc290c593fda9092a",
+		"0000000000000000000000000000000000000000000000000000000000000000",
+		"0000000000000000000000000000000000000000000000000000000000000000",
+		"0000000000000000000000000000000000000000000000000000000000000000",
+		"33018202c57d898b84338b16d1a4960e133c6a4d656cfec1bd62a9ea00611729",
+		"bdbee2bd246ba0259a37be9a8740b550eed01c566aff0dca9a07306bcf731d13",
+		"0000000000000000000000000000000000000000000000000000000000000000",
+		"0000000000000000000000000000000000000000000000000000000000000000",
+		"d43b04d7c2d0bba83b4291fea9ba0fec7830d17af54cbe9967fe90b8244d4e0d",
+		"0000000000000000000000000000000000000000000000000000000000000000",
+		"7def274dbb3a72dca44f01a8d9f2f21a5be84c171eecef8e2e4112e7277e262a",
+	}
+	siblings = make([][]byte, len(siblingsHex))
+	for i := 0; i < len(siblingsHex); i++ {
+		siblings[i], err = hex.DecodeString(siblingsHex[i])
+		c.Assert(err, qt.IsNil)
+	}
+
+	packed, err = PackSiblings(HashFunctionPoseidon, siblings)
+	c.Assert(err, qt.IsNil)
+	c.Assert(hex.EncodeToString(packed), qt.Equals, "a60002003105"+
+		"1ce165cb1124ed3a0a94b4e212aaf7e8079f49b2fbef916bc290c593fda9092a"+
+		"33018202c57d898b84338b16d1a4960e133c6a4d656cfec1bd62a9ea00611729"+
+		"bdbee2bd246ba0259a37be9a8740b550eed01c566aff0dca9a07306bcf731d13"+
+		"d43b04d7c2d0bba83b4291fea9ba0fec7830d17af54cbe9967fe90b8244d4e0d"+
+		"7def274dbb3a72dca44f01a8d9f2f21a5be84c171eecef8e2e4112e7277e262a")
+
+	unpacked, err = UnpackSiblings(HashFunctionPoseidon, packed)
+	c.Assert(err, qt.IsNil)
+	c.Assert(unpacked, qt.DeepEquals, siblings)
+}
+
 func TestGenProofAndVerify(t *testing.T) {
 	c := qt.New(t)
 	database, err := badgerdb.New(badgerdb.Options{Path: c.TempDir()})