codecov doesn't cover the blockchain module

[danielabrozzoni]

Describe the bug
Codecoverage says that out coverage for the blockchain module is 1.87%, even do we do have tests covering that module. It might be configured in the wrong way.

To Reproduce
Open https://app.codecov.io/gh/bitcoindevkit/bdk, look at the end of the page, where it shows coverage for the different directories:

Expected behavior
Decent blockchain module coverage

UPDATE: after #708, we can see most of the blockchain module coverage at https://coveralls.io/github/bitcoindevkit/bdk?branch=master . More work is needed for including the missing blockchains (esplora, compact filters) in the coverage. See #696 (comment)

[rajarshimaitra]

The problem is we are separately specifying a code coverage job which only includes features all-keys,compiler,esplora,ureq,compact_filters --no-default-features..

So our code coverage reports are rightly incomplete.. The right thing to do here is run all the tests in one job and report coverage from there..

[notmandatory]

The work done for #708 should also help address this issue.

[danielabrozzoni]

With #708 we cover most of the blockchain modules, but esplora. I'll update the title accordingly. The solution is probably to run the tests multiple time and then merge the reports.

[danielabrozzoni]

I've tried merging the reports in #748, but it doesn't seem to be working very well, and there's not much we can do (see #748 (comment)). I'm closing this for now.