github, gitlab: improve coverage

Mainly by testing bits that don't require an actual service to be around.

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See: #84

requested review from @brad.king

added 9 commits

• 6e0b28de - testing: use a lower `BACKOFF_LIMIT` when testing
• d608e311 - gitlab: improve commit status state conversion function names
• 9468a8b1 - github: update test function names to match patterns
• 9e3aa34a - gitlab: test backoff behavior
• 21477e39 - gitlab: test ghostflow/gitlab conversion functions
• 7a3f87c2 - gitlab: test Reference* types
• 336af83e - github: test some ghostflow conversion routines
• c8879054 - github: test the set of request headers
• 6d5dc897 - github: fix test failure string

Compare with previous version

added 2 commits

• 96b2052b - github: test the set of request headers
• a67dfa6a - github: fix test failure string

Compare with previous version

Warnings:

• please consider adding a changelog entry in one of the ghostflow/CHANGELOG.md, ghostflow-cli/CHANGELOG.md, ghostflow-github/CHANGELOG.md, ghostflow-gitlab/CHANGELOG.md files.

The warnings do not need to be fixed, but it is recommended to do so.

+1

Do: merge

mentioned in commit 748a1263

merged manually