Measuring test coverage and enforcing coverage minimums

[rngadam]

I've ran locally testing and coverage:

https://gist.github.com/rngadam/3be78ce66a9afc0326de08f4f36ccc15

summarized results exported report has:

$ cat summary.json | jq .data[0].totals.lines.percent
57.37736209200229

is there an interest in reporting this test coverage and ensuring coverage stays at least at this value in the Github Workflow?

[rngadam]

Put some time using cargo llvm-cov to generate reporting as html:

https://mcn-ing.github.io/anoncreds-rs/

eventually I can cleanup the Github Workflow and submit a PR if there is an interest.

Files of note that seem to have significant logic that is not covered by the test suite:

• ffi
• https://mcn-ing.github.io/anoncreds-rs/coverage/home/runner/work/anoncreds-rs/anoncreds-rs/src/utils/hash.rs.html
• https://mcn-ing.github.io/anoncreds-rs/coverage/home/runner/work/anoncreds-rs/anoncreds-rs/src/data_types/cred_offer.rs.html
• https://mcn-ing.github.io/anoncreds-rs/coverage/home/runner/work/anoncreds-rs/anoncreds-rs/src/data_types/presentation.rs.html
• https://mcn-ing.github.io/anoncreds-rs/coverage/home/runner/work/anoncreds-rs/anoncreds-rs/src/error.rs.html