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package forking
import (
"math/big"
"testing"
"github.com/ethereum/go-ethereum/common"
"github.com/holiman/uint256"
"github.com/stretchr/testify/mock"
"github.com/stretchr/testify/require"
)
// MockForkSource implements ForkSource interface for testing
type MockForkSource struct {
mock.Mock
}
func (m *MockForkSource) URLOrAlias() string {
args := m.Called()
return args.String(0)
}
func (m *MockForkSource) StateRoot() common.Hash {
args := m.Called()
return args.Get(0).(common.Hash)
}
func (m *MockForkSource) Nonce(addr common.Address) (uint64, error) {
args := m.Called(addr)
return args.Get(0).(uint64), args.Error(1)
}
func (m *MockForkSource) Balance(addr common.Address) (*uint256.Int, error) {
args := m.Called(addr)
if args.Get(0) == nil {
return nil, args.Error(1)
}
return args.Get(0).(*uint256.Int), args.Error(1)
}
func (m *MockForkSource) StorageAt(addr common.Address, key common.Hash) (common.Hash, error) {
args := m.Called(addr, key)
return args.Get(0).(common.Hash), args.Error(1)
}
func (m *MockForkSource) Code(addr common.Address) ([]byte, error) {
args := m.Called(addr)
return args.Get(0).([]byte), args.Error(1)
}
func setupCache(t *testing.T) (*CachedSource, *MockForkSource) {
mockSource := new(MockForkSource)
stateRoot := common.HexToHash("0x1234")
mockSource.On("StateRoot").Return(stateRoot)
mockSource.On("URLOrAlias").Return("test_source")
cached := Cache(mockSource)
require.NotNil(t, cached)
require.Equal(t, stateRoot, cached.StateRoot())
require.Equal(t, "test_source", cached.URLOrAlias())
return cached, mockSource
}
func TestCachedSource_Nonce(t *testing.T) {
cached, mockSource := setupCache(t)
addr := common.HexToAddress("0x1234")
expectedNonce := uint64(42)
// First call should hit the source
mockSource.On("Nonce", addr).Return(expectedNonce, nil).Once()
nonce, err := cached.Nonce(addr)
require.NoError(t, err)
require.Equal(t, expectedNonce, nonce)
// Second call should use cache
nonce, err = cached.Nonce(addr)
require.NoError(t, err)
require.Equal(t, expectedNonce, nonce)
mockSource.AssertNumberOfCalls(t, "Nonce", 1)
}
func TestCachedSource_Balance(t *testing.T) {
cached, mockSource := setupCache(t)
addr := common.HexToAddress("0x5678")
expectedBalance := uint256.NewInt(1000)
// First call should hit the source
mockSource.On("Balance", addr).Return(expectedBalance, nil).Once()
balance, err := cached.Balance(addr)
require.NoError(t, err)
require.Equal(t, expectedBalance, balance)
// Second call should use cache
balance, err = cached.Balance(addr)
require.NoError(t, err)
require.Equal(t, expectedBalance, balance)
// Verify the returned balance is a clone
balance.Add(balance, uint256.NewInt(1))
cachedBalance, _ := cached.Balance(addr)
require.Equal(t, expectedBalance, cachedBalance)
mockSource.AssertNumberOfCalls(t, "Balance", 1)
}
func TestCachedSource_Storage(t *testing.T) {
cached, mockSource := setupCache(t)
addr := common.HexToAddress("0x9abc")
slot := common.HexToHash("0xdef0")
expectedValue := common.HexToHash("0x1234")
// First call should hit the source
mockSource.On("StorageAt", addr, slot).Return(expectedValue, nil).Once()
value, err := cached.StorageAt(addr, slot)
require.NoError(t, err)
require.Equal(t, expectedValue, value)
// Second call should use cache
value, err = cached.StorageAt(addr, slot)
require.NoError(t, err)
require.Equal(t, expectedValue, value)
mockSource.AssertNumberOfCalls(t, "StorageAt", 1)
}
func TestCachedSource_Code(t *testing.T) {
cached, mockSource := setupCache(t)
addr := common.HexToAddress("0xdef0")
expectedCode := []byte{1, 2, 3, 4}
// First call should hit the source
mockSource.On("Code", addr).Return(expectedCode, nil).Once()
code, err := cached.Code(addr)
require.NoError(t, err)
require.Equal(t, expectedCode, code)
// Second call should use cache
code, err = cached.Code(addr)
require.NoError(t, err)
require.Equal(t, expectedCode, code)
mockSource.AssertNumberOfCalls(t, "Code", 1)
}
func TestCachedSource_CacheEviction(t *testing.T) {
cached, mockSource := setupCache(t)
// Test nonce cache eviction
for i := 0; i < 1001; i++ { // Cache size is 1000
addr := common.BigToAddress(big.NewInt(int64(i)))
mockSource.On("Nonce", addr).Return(uint64(i), nil).Once()
_, _ = cached.Nonce(addr)
}
// This should cause first address to be evicted
firstAddr := common.BytesToAddress([]byte{0})
mockSource.On("Nonce", firstAddr).Return(uint64(0), nil).Once()
_, _ = cached.Nonce(firstAddr)
mockSource.AssertNumberOfCalls(t, "Nonce", 1002) // 1001 + 1 for evicted key
}
func TestCachedSource_MultipleStorageSlots(t *testing.T) {
cached, mockSource := setupCache(t)
addr := common.HexToAddress("0xabcd")
slot1 := common.HexToHash("0x1111")
slot2 := common.HexToHash("0x2222")
value1 := common.HexToHash("0x3333")
value2 := common.HexToHash("0x4444")
mockSource.On("StorageAt", addr, slot1).Return(value1, nil).Once()
mockSource.On("StorageAt", addr, slot2).Return(value2, nil).Once()
// Different slots should trigger separate cache entries
val1, err := cached.StorageAt(addr, slot1)
require.NoError(t, err)
require.Equal(t, value1, val1)
val2, err := cached.StorageAt(addr, slot2)
require.NoError(t, err)
require.Equal(t, value2, val2)
// Verify both are cached
val1Again, _ := cached.StorageAt(addr, slot1)
val2Again, _ := cached.StorageAt(addr, slot2)
require.Equal(t, value1, val1Again)
require.Equal(t, value2, val2Again)
mockSource.AssertNumberOfCalls(t, "StorageAt", 2)
}