Fix non-deterministic BIDS table file order in test_table

[clane9]

Fix non-deterministic BIDS table file order in test_table and add more asserts to check the expected fields. Fixes #26.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.55%. Comparing base (9322fcf) to head (b7ebfb6).
Report is 2 commits behind head on main.

❗ Current head b7ebfb6 differs from pull request most recent head 5443e3a. Consider uploading reports for the commit 5443e3a to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #29      +/-   ##
==========================================
- Coverage   93.18%   88.55%   -4.64%     
==========================================
  Files          10       11       +1     
  Lines         558      603      +45     
==========================================
+ Hits          520      534      +14     
- Misses         38       69      +31     

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