clean up coverage files generated by test

[aviatesk]

I found generated coverage files corresponding to source files a bit noisy, e.g. in a source tree view in my local editor.
I think we can just clean them up after test?

[codecov]

Codecov Report

Merging #522 (e265855) into master (1a92d9a) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #522   +/-   ##
=======================================
  Coverage   86.95%   86.95%           
=======================================
  Files          12       12           
  Lines        2422     2422           
=======================================
  Hits         2106     2106           
  Misses        316      316           

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[simeonschaub]

I wonder whether there's a way to get the exact extension of the coverage files generated by this specific spawned Julia session. Just might be a little bit cleaner since there might already be coverage data from previous profiles in the src folder which we don't necessarily want to delete if anyone runs the tests.

[simeonschaub]

Ok, I looked into it and it seems to just use the pid of the process, so you could do something like:

p = run(`julia -E 'Libc.getpid()'`; wait=false)
pid = Libc.getpid(p)
wait(p)

and then only delete files ending in .$pid.cov.

[aviatesk]

Thanks! Now I think this deletes coverage files more nicely.