Add extra test case for bitround error

[martindurant]

#392 (comment)

TODO:

• Unit tests and/or doctests in docstrings
• Tests pass locally
• Docstrings and API docs for any new/modified user-facing classes and functions
• Changes documented in docs/release.rst
• Docs build locally
• GitHub Actions CI passes
• Test coverage to 100% (Codecov passes)

[martindurant]

When I pulled from main to make this change:

45 files changed, 370 insertions(+), 83033 deletions(-)

:)

[codecov]

Codecov Report

Merging #393 (9c64a1f) into main (ff65b71) will increase coverage by 0.04%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #393      +/-   ##
==========================================
+ Coverage   99.57%   99.61%   +0.04%     
==========================================
  Files          54       54              
  Lines        2099     2101       +2     
==========================================
+ Hits         2090     2093       +3     
+ Misses          9        8       -1     

Impacted Files	Coverage Δ
numcodecs/tests/test_bitround.py	100.00% <100.00%> (ø)
numcodecs/bitround.py	100.00% <0.00%> (+3.03%)	⬆️

[jakirkham]

Thanks Martin! 🙏