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fuzz-tests: improve fuzz-channel_id #8386

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@Chand-ra Chand-ra commented Jun 30, 2025

Add a couple of improvements to the fuzz test tests/fuzz/fuzz-channel_id. Commit the newly discovered seed corpus inputs as well.

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  • The changelog has been updated in the relevant commit(s) according to the guidelines.
  • Tests have been added or modified to reflect the changes.
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CC: @morehouse

Chandra Pratap added 3 commits June 13, 2025 11:50
Changelog-None: `memcmp()` the output of `towire_channel_id()`
and the input to `fromwire_channel_id()` to ensure that wire
encoding-decoding is correctly performed.
Replace instances of 36 with sizeof(outpoint) and 32 with
sizeof(chan_id) since that's what they represent. This makes
the test more future-proof.
Improvements in the fuzz-testing scheme of `fuzz-channel_id led
to the discovery of test inputs that result in greater in code
coverage. Add these inputs to the test's seed corpus.
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ACK 67e3ef3

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