update tests to use unittest

[kkappler]

• Add a test for time_series.windowing_scheme.WindowingScheme.apply_fft that uses both xr.Dataset and xr.DataArray

[codecov]

Codecov Report

Merging #205 (ce6c5e2) into main (60d728d) will increase coverage by 0.36%.
The diff coverage is 88.65%.

@@            Coverage Diff             @@
##             main     #205      +/-   ##
==========================================
+ Coverage   72.09%   72.46%   +0.36%     
==========================================
  Files         100      100              
  Lines        5688     5687       -1     
==========================================
+ Hits         4101     4121      +20     
+ Misses       1587     1566      -21     

Impacted Files	Coverage Δ
aurora/pipelines/time_series_helpers.py	89.47% <0.00%> (-0.80%)	⬇️
aurora/time_series/windowed_time_series.py	54.09% <ø> (+0.97%)	⬆️
aurora/time_series/windowing_scheme.py	92.56% <ø> (+2.47%)	⬆️
docs/conf.py	92.30% <ø> (ø)
tests/time_series/test_windowing_scheme.py	91.34% <91.11%> (+14.34%)	⬆️
aurora/config/metadata/channel_nomenclature.py	90.76% <100.00%> (-0.41%)	⬇️
aurora/time_series/decorators.py	73.91% <100.00%> (+13.04%)	⬆️

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