tests: fuzz rx and tx hooks in honda.h #2957
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Description
This makes incremental progress towards #2944. In this PR, I utilize the helper functions added in #2952 to thoroughly test rx and tx hooks in honda.h.
Adds coverage for the following lines (NOTE: these line numbers are what were reported by gcovr. They sometimes point to the last covered line before an uncovered branch):
Verification
opendbc/safety/tests/test.sh --report(with branch coverage enabled) on master:Overall branch coverage: 92.3%
opendbc/safety/tests/test.sh --reporton this branch:Overall branch coverage: 92.8%