fix finalizer_test.go

[lesterli]

Summary

This PR completed the first task in #24 to fix the failed tests in the finalizer_test.go.

We updated finalizer.go to check the finality on each L2 block in this PR #23 (comment), which

• added a l2Fetcher to fetch each L2 block

   type FinalizerL2Interface interface {
   	L2BlockRefByNumber(context.Context, uint64) (eth.L2BlockRef, error)
   }

• updated the SDK query function to check a range of L2 blocks

   type BabylonFinalityClient interface {
   	QueryBlockRangeBabylonFinalized(queryBlocks []*cwclient.L2Block) (*uint64, error)
   }

So we added two helper functions in the finalizer_test.go.

func mockL2BlockRefByNumberWithTimes(l2F *testutils.MockL2Client, times int, refs ...eth.L2BlockRef)
func mockQueryBlockRangeBabylonFinalizedWithTimes(sdkClient *mocks.MockISdkClient, times int, refs ...eth.L2BlockRef)

Also, we added a function in the mock_l2.go to support the mock times.

func (m *MockL2Client) ExpectL2BlockRefByNumberWithTimes(num uint64, ref eth.L2BlockRef, times int, err error)

Test Plan

make lint-go

cd op-node
make test

Also, connect with FP e2e tests locally and make sure all test cases are passed.

[bap2pecs]