Fix broken unittests

[jeremykubica]

The HATS unittests were failing because of trying to compare a list with units to a threshold without units.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.75%. Comparing base (ff2fa17) to head (c9ca586).
Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #383   +/-   ##
=======================================
  Coverage   92.75%   92.75%           
=======================================
  Files          48       48           
  Lines        1933     1933           
=======================================
  Hits         1793     1793           
  Misses        140      140           

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[github-actions]

Before [f6d84a8]	After [7535732]	Ratio	Benchmark (Parameter)
13.8±0.4ms	14.3±0.2ms	1.04	benchmarks.Suite.time_inner_pixel_alignment
75.1±0.6ms	75.3±0.5ms	1	benchmarks.MetadataSuite.time_load_partition_info_order7
358±3ms	359±5ms	1	benchmarks.Suite.time_outer_pixel_alignment
90.3±2ms	90.1±3ms	1	benchmarks.Suite.time_paths_creation
958±10μs	954±2μs	1	benchmarks.time_test_cone_filter_multiple_order
51.4±1ms	50.6±1ms	0.99	benchmarks.Suite.time_pixel_tree_creation
75.6±0.6ms	74.1±1ms	0.98	benchmarks.MetadataSuite.time_load_partition_join_info
129±1ms	127±0.7ms	0.98	benchmarks.time_test_alignment_even_sky
21.0±0.2ms	20.4±0.1ms	0.97	benchmarks.MetadataSuite.time_load_partition_info_order6

Click here to view all benchmarks.