nimbus-eth2/tests/fuzzing/ssz_fuzzing.nim

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import
testutils/fuzzing, faststreams/inputs, serialization/testing/tracing,
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../../beacon_chain/ssz,
../../beacon_chain/spec/[datatypes, crypto, digest, datatypes]
export
ssz, datatypes, crypto, digest, fuzzing
template sszFuzzingTest*(T: type) =
test:
block:
let input = unsafeMemoryInput(payload)
let decoded = try: input.readValue(SSZ, T)
except SSZError: break
if input.len.get > 0:
# Some unconsumed input remained, this is not a valid test case
break
let reEncoded = SSZ.encode(decoded)
when T isnot SignedBeaconBlock:
let hash = hash_tree_root(decoded)
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if payload != reEncoded:
when hasSerializationTracing:
# Run deserialization again to produce a seriazation trace
# (this is useful for comparing with the initial deserialization)
discard SSZ.decode(reEncoded, T)
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echo "Payload with len = ", payload.len
echo payload
echo "Re-encoided payload with len = ", reEncoded.len
echo reEncoded
when T isnot SignedBeaconBlock:
echo "HTR: ", hash
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echo repr(decoded)
doAssert false