Add tests for nft detection

Author: Jetlum

mock/nft_mock_test.go

@@ -0,0 +1,31 @@
+package mock
+
+import (
+	"math/big"
+	"testing"
+
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/core/types"
+	"github.com/stretchr/testify/assert"
+)
+
+func TestMockNFTDetector(t *testing.T) {
+	detector := NewMockNFTDetector()
+
+	t.Run("Known contract", func(t *testing.T) {
+		detector.Reset()
+		address := common.HexToAddress("0xBAYC")
+		detector.AddKnownContract(address)
+
+		tx := types.NewTransaction(
+			0,
+			address, // Remove & operator, use Address directly
+			big.NewInt(0),
+			21000,
+			big.NewInt(1),
+			nil,
+		)
+		result := detector.IsNFTTransaction(tx)
+		assert.True(t, result)
+	})
+}