We should add a coverage test to stratis-min testing

[mulkieran]

It should be easy to get complete coverage information for the stratis-min chunk of code.

[mulkieran]

The first step is getting the complete coverage. As ever, we will have to exclude a few things, but llvm-cov tool does not have a convenient way of annotating lines, unlike the standard Python coverage tools. This means that there is more of a benefit to using, e..,g., codecov because we can get changes in the coverage induced by a PR, which is an informative kind of information. See example: rust-netlink/netlink-packet-route#59 (comment)

[mulkieran]

Coverage at 64.8%.