fix: Fix and re-enable previously broken tests

[mctavish]

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Fixes #1072 🦕

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (firebase-backend@842690f). Click here to learn what that means.
The diff coverage is n/a.

@@                 Coverage Diff                 @@
##             firebase-backend    #1075   +/-   ##
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  Coverage                    ?   66.13%           
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  Files                       ?       21           
  Lines                       ?     1751           
  Branches                    ?      352           
===================================================
  Hits                        ?     1158           
  Misses                      ?      510           
  Partials                    ?       83           

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[mctavish]

@jasonborg Please also review 842690f