ENH: port more tests from wrablib

[kmuehlbauer]

partly: #72

[codecov]

Codecov Report

Merging #73 (8619e03) into main (ed03a46) will increase coverage by 3.14%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #73      +/-   ##
==========================================
+ Coverage   84.82%   87.97%   +3.14%     
==========================================
  Files          18       18              
  Lines        3223     3235      +12     
==========================================
+ Hits         2734     2846     +112     
+ Misses        489      389     -100     

Flag	Coverage Δ
unittests	87.97% <100.00%> (+3.14%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
xradar/util.py	96.49% <100.00%> (+0.41%)	⬆️
xradar/io/backends/furuno.py	91.54% <0.00%> (+2.11%)	⬆️
xradar/io/backends/iris.py	84.85% <0.00%> (+5.84%)	⬆️
xradar/io/backends/rainbow.py	90.14% <0.00%> (+7.69%)	⬆️

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