tests: Regression check src/bignum.c

Simon Josefssonrequested to merge
jas/libssh-mirror:jas/test-bignum into master

This adds regression checking of the bignum code in src/bignum.c. The !400 (closed) merge request adds new APIs to src/bignum.c and should eventually extend this regression check.

Note that this merge request depends on !408 (closed) which could be merged first, or this merge request could be merged directly since it includes that commit too. Dependent merge request appears to be a premium-only GitLab feature, so I'm not sure how to best submit a merge request that depends on another merge request for libssh. Suggestions? This merge request could have avoided the !408 (closed) commit, but then the pipeline would fail.

Checklist

  • Commits have Signed-off-by: with name/author being identical to the commit author
  • Code modified for feature
  • Test suite updated with functionality tests
  • Test suite updated with negative tests
  • Documentation updated

Reviewer's checklist:

  • Any issues marked for closing are addressed
  • There is a test suite reasonably covering new functionality or modifications
  • Function naming, parameters, return values, types, etc., are consistent and according to CONTRIBUTING.md
  • This feature/change has adequate documentation added
  • No obvious mistakes in the code

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