diff --git a/consensus/XDPoS/XDPoS_test.go b/consensus/XDPoS/XDPoS_test.go
new file mode 100644
index 0000000000..7bb50dcf7e
--- /dev/null
+++ b/consensus/XDPoS/XDPoS_test.go
@@ -0,0 +1,47 @@
+package XDPoS
+
+import (
+	"testing"
+	"math/big"
+	"fmt"
+
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/core/types"
+	"github.com/ethereum/go-ethereum/params"
+)
+
+func TestGetM1M2FromCheckpointHeader(t *testing.T) {
+	masternodes := []common.Address{
+		common.StringToAddress("aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"),
+		common.StringToAddress("bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb"),
+		common.StringToAddress("cccccccccccccccccccccccccccccccccccccccc"),
+	}
+	validators := []int64{
+		2,
+		1,
+		0,
+	}
+	epoch := int64(900)
+	config := &params.ChainConfig{
+		XDPoS: &params.XDPoSConfig{
+			Epoch: uint64(epoch),
+		},
+	}
+	//try from block 900 to 909
+	for i:=int64(0); i<9; i++ {
+		currentHeader := &types.Header{
+			Number: big.NewInt(epoch+i),
+		}
+		m1m2, moveM2, err := getM1M2(masternodes, validators, currentHeader, config)
+		if err != nil {
+			t.Error("can't get m1m2", "err", err)
+		}
+		fmt.Printf("block: %v, moveM2: %v\n", currentHeader.Number.Int64(), moveM2)
+		for _,k := range masternodes {
+			fmt.Printf("m1: %v - m2: %v\n", k.Str(), m1m2[k].Str())
+		}
+		if moveM2 != uint64(i/3) { //3 = len(masternodes)
+			t.Error("wrong moveM2", "want", uint64(i/3), "have", moveM2)
+		}
+	}
+}
\ No newline at end of file