diff --git a/payouts/unlocker_test.go b/payouts/unlocker_test.go
new file mode 100644
index 0000000..434897e
--- /dev/null
+++ b/payouts/unlocker_test.go
@@ -0,0 +1,158 @@
+package payouts
+
+import (
+	"math/big"
+	"os"
+	"testing"
+
+	"github.com/yuriy0803/open-etc-pool-friends/rpc"
+	"github.com/yuriy0803/open-etc-pool-friends/storage"
+)
+
+func TestMain(m *testing.M) {
+	os.Exit(m.Run())
+}
+
+func TestCalculateRewards(t *testing.T) {
+	blockReward, _ := new(big.Rat).SetString("5000000000000000000")
+	shares := map[string]int64{"0x0": 1000000, "0x1": 20000, "0x2": 5000, "0x3": 10, "0x4": 1}
+	expectedRewards := map[string]int64{"0x0": 4877996431, "0x1": 97559929, "0x2": 24389982, "0x3": 48780, "0x4": 4878}
+	totalShares := int64(1025011)
+
+	rewards, percent := calculateRewardsForShares(shares, totalShares, blockReward)
+	expectedTotalAmount := int64(5000000000)
+
+	totalAmount := int64(0)
+	for login, amount := range rewards {
+		totalAmount += amount
+
+		if expectedRewards[login] != amount {
+			t.Errorf("Amount for %v must be equal to %v vs %v , %v", login, expectedRewards[login], amount, percent)
+		}
+	}
+	if totalAmount != expectedTotalAmount {
+		t.Errorf("Total reward must be equal to block reward in Shannon: %v vs %v", expectedTotalAmount, totalAmount)
+	}
+}
+
+func TestChargeFee(t *testing.T) {
+	orig, _ := new(big.Rat).SetString("5000000000000000000")
+	value, _ := new(big.Rat).SetString("5000000000000000000")
+	expectedNewValue, _ := new(big.Rat).SetString("3750000000000000000")
+	expectedFee, _ := new(big.Rat).SetString("1250000000000000000")
+	newValue, fee := chargeFee(orig, 25.0)
+
+	if orig.Cmp(value) != 0 {
+		t.Error("Must not change original value")
+	}
+	if newValue.Cmp(expectedNewValue) != 0 {
+		t.Error("Must charge and deduct correct fee")
+	}
+	if fee.Cmp(expectedFee) != 0 {
+		t.Error("Must charge fee")
+	}
+}
+
+func TestWeiToShannonInt64(t *testing.T) {
+	wei, _ := new(big.Rat).SetString("1000000000000000000")
+	origWei, _ := new(big.Rat).SetString("1000000000000000000")
+	shannon := int64(1000000000)
+
+	if weiToShannonInt64(wei) != shannon {
+		t.Error("Must convert to Shannon")
+	}
+	if wei.Cmp(origWei) != 0 {
+		t.Error("Must charge original value")
+	}
+}
+
+func TestGetUncleReward(t *testing.T) {
+	rewards := make(map[int64]string)
+	expectedRewards := map[int64]string{
+		1: "4375000000000000000",
+		2: "3750000000000000000",
+		3: "3125000000000000000",
+		4: "2500000000000000000",
+		5: "1875000000000000000",
+		6: "1250000000000000000",
+	}
+	for i := int64(1); i < 7; i++ {
+		rewards[i] = getUncleReward(1, i+1, true).String()
+	}
+	for i, reward := range rewards {
+		if expectedRewards[i] != rewards[i] {
+			t.Errorf("Incorrect uncle reward for %v, expected %v vs %v", i, expectedRewards[i], reward)
+		}
+	}
+}
+
+func TestGetByzantiumUncleReward(t *testing.T) {
+	rewards := make(map[int64]string)
+	expectedRewards := map[int64]string{
+		1: "2625000000000000000",
+		2: "2250000000000000000",
+		3: "1875000000000000000",
+		4: "1500000000000000000",
+		5: "1125000000000000000",
+		6: "750000000000000000",
+		7: "375000000000000000",
+	}
+	for i := int64(1); i < 8; i++ {
+		rewards[i] = getUncleReward(byzantiumHardForkHeight, byzantiumHardForkHeight+i, true).String()
+	}
+	for i, reward := range rewards {
+		if expectedRewards[i] != rewards[i] {
+			t.Errorf("Incorrect uncle reward for %v, expected %v vs %v", i, expectedRewards[i], reward)
+		}
+	}
+}
+
+func TestGetRewardForUncle(t *testing.T) {
+	reward := getRewardForUncle(1).String()
+	expectedReward := "156250000000000000"
+	if expectedReward != reward {
+		t.Errorf("Incorrect uncle bonus for height %v, expected %v vs %v", 1, expectedReward, reward)
+	}
+}
+
+func TestGetByzantiumRewardForUncle(t *testing.T) {
+	reward := getRewardForUncle(byzantiumHardForkHeight).String()
+	expectedReward := "93750000000000000"
+	if expectedReward != reward {
+		t.Errorf("Incorrect uncle bonus for height %v, expected %v vs %v", byzantiumHardForkHeight, expectedReward, reward)
+	}
+}
+
+func TestGetConstantinopleRewardForUncle(t *testing.T) {
+	reward := getRewardForUncle(constantinopleHardForkHeight).String()
+	expectedReward := "62500000000000000"
+	if expectedReward != reward {
+		t.Errorf("Incorrect uncle bonus for height %v, expected %v vs %v", constantinopleHardForkHeight, expectedReward, reward)
+	}
+}
+
+func TestMatchCandidate(t *testing.T) {
+	gethBlock := &rpc.GetBlockReply{Hash: "0x12345A", Nonce: "0x1A"}
+	parityBlock := &rpc.GetBlockReply{Hash: "0x12345A", SealFields: []string{"0x0A", "0x1A"}}
+	candidate := &storage.BlockData{Nonce: "0x1a"}
+	orphan := &storage.BlockData{Nonce: "0x1abc"}
+
+	if !matchCandidate(gethBlock, candidate) {
+		t.Error("Must match with nonce")
+	}
+	if !matchCandidate(parityBlock, candidate) {
+		t.Error("Must match with seal fields")
+	}
+	if matchCandidate(gethBlock, orphan) {
+		t.Error("Must not match with orphan with nonce")
+	}
+	if matchCandidate(parityBlock, orphan) {
+		t.Error("Must not match orphan with seal fields")
+	}
+
+	block := &rpc.GetBlockReply{Hash: "0x12345A"}
+	immature := &storage.BlockData{Hash: "0x12345a", Nonce: "0x0"}
+	if !matchCandidate(block, immature) {
+		t.Error("Must match with hash")
+	}
+}