In tests, leave SQLAlchemy in charge of establishing engine connection

[lpsinger]

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[codecov]

Codecov Report

Merging #46 (617ff7b) into main (77ae80c) will not change coverage.
The diff coverage is n/a.

❗ Current head 617ff7b differs from pull request most recent head d6d444a. Consider uploading reports for the commit d6d444a to get more accurate results

@@           Coverage Diff           @@
##             main      #46   +/-   ##
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  Coverage   96.20%   96.20%           
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  Files           4        4           
  Lines          79       79           
=======================================
  Hits           76       76           
  Misses          3        3           

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