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tests: Add deserialization fuzzing of SnapshotMetadata (utxo_snapshot). Increase fuzzing coverage.
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Authored by Fabien on Dec 9 2020, 15:05.

Details

Summary
Add deserialization fuzzing of SnapshotMetadata (utxo_snapshot).

Increase fuzzing coverage.

Backport of core PR18314.

The commit 117a706faba586f2095f97cf630b709b3e29a947:
https://github.com/bitcoin/bitcoin/pull/18314/commits/117a706faba586f2095f97cf630b709b3e29a947
is not ported as this function has been removed from our codebase (was
dead code, see D5992.

Test Plan
ninja bitcoin-fuzzers
./test/fuzz/test_runner.py <path_to_corpus>