Add another test for creating index table.

[delucchi-cmu]

Change Description

I woke up bothered because something should have failed prior to #189.

All Norder/Npix values happened to be the same because we were only testing with a primary catalog with a single Norder/Npix. Using a catalog with mixed Norder/Npix would fail when writing parquet metadata, unless setting order_by_healpix=False, which is added in PR #189.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (c96627a) 99.76% compared to head (d242594) 99.76%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #190   +/-   ##
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  Coverage   99.76%   99.76%           
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  Files          27       27           
  Lines        1273     1273           
=======================================
  Hits         1270     1270           
  Misses          3        3           

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