Add codecov coverage job in integrity-check.yml

[0scvr]

Added Codecov to the CI pipeline to display test coverage on pull requests and on Readme badge.

See #534.

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[thehenrytsai]

@0scvr, I've enabled workflow for this PR, so hopefully this will be sufficient for validating your changes!

[codecov-commenter]

Welcome to Codecov 🎉

Once merged to your default branch, Codecov will compare your coverage reports and display the results in this comment.

Thanks for integrating Codecov - We've got you covered ☂️

[thehenrytsai]

Looks like it's on the right path! Checking off one of the minbar requirements:

• The README.md shows the latest updated code coverage numbers.
• Showing code coverage delta/difference for each submitted PR.
• Have a customized codecov.yml tailored to our needs:
  1. Require 100% coverage on new code
  2. Require coverage to never drop
  3. Exclude interface/type files if needed

[0scvr]

@thehenrytsai Could you try running the build job again to see if it works/what needs changing please ?

[thehenrytsai]

Thanks for adding the yml config file. Last thing left is to update the README!

[0scvr]

Thanks for adding the yml config file. Last thing left is to update the README!

Should be done now, but you might need to add ?token=XXXXX add the end of the URL if coverage doesn't appear after merge.

Here's some instructions on how to do that https://docs.codecov.com/docs/status-badges