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package derive
import (
"testing"
"github.com/ethereum-optimism/optimism/op-service/testutils/fuzzerutils"
fuzz "github.com/google/gofuzz"
"github.com/stretchr/testify/require"
)
// FuzzBatchRoundTrip executes a fuzz test similar to TestBatchRoundTrip, which tests that arbitrary BatchData will be
// encoded and decoded without loss of its original values.
// Does not test the span batch type because the fuzzer is not aware of the structure of a span batch.
func FuzzBatchRoundTrip(f *testing.F) {
f.Fuzz(func(t *testing.T, fuzzedData []byte) {
// Create our fuzzer wrapper to generate complex values
typeProvider := fuzz.NewFromGoFuzz(fuzzedData).NilChance(0).MaxDepth(10000).NumElements(0, 0x100).AllowUnexportedFields(true)
fuzzerutils.AddFuzzerFunctions(typeProvider)
// Create our batch data from fuzzed data
var batchData BatchData
typeProvider.Fuzz(&batchData)
// force batchdata to only contain singular batch
batchData.BatchType = SingularBatchType
batchData.RawSpanBatch = RawSpanBatch{}
// Encode our batch data
enc, err := batchData.MarshalBinary()
require.NoError(t, err)
// Decode our encoded batch data
var dec BatchData
err = dec.UnmarshalBinary(enc)
require.NoError(t, err)
// Ensure the round trip encoding of batch data did not result in data loss
require.Equal(t, &batchData, &dec, "round trip batch encoding/decoding did not match original values")
})
}