FIX: testsuite

[kmuehlbauer]

… should finally resolve annoying bus error in CI

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.97%. Comparing base (c998f25) to head (26ea0f4).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #214   +/-   ##
=======================================
  Coverage   91.97%   91.97%           
=======================================
  Files          23       23           
  Lines        4573     4573           
=======================================
  Hits         4206     4206           
  Misses        367      367           

Flag	Coverage Δ
notebooktests	78.24% <ø> (ø)
unittests	90.24% <ø> (ø)

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[kmuehlbauer]

This is frustrating. It seems that the nightly xarray test over in #213 works now. But there are more changes there wrt contextmanager. So I'll pull these changes here, too.

[kmuehlbauer]

When running all tests in serial fashion, no bus error. There is something very strange going on with numpy.memmap and how we use the file fixtures for nexrad level2 files.

I've removed one test (which is already in test_io.py) from nexrad_level2 tests and reinstated the --dist loadfile (runs all tests in one file in serial fashion).