Improve test coverage

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[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@c630bbb). Click here to learn what that means.
The diff coverage is 100%.

@@            Coverage Diff            @@
##             master     #159   +/-   ##
=========================================
  Coverage          ?   96.14%           
=========================================
  Files             ?       22           
  Lines             ?      934           
  Branches          ?        0           
=========================================
  Hits              ?      898           
  Misses            ?       36           
  Partials          ?        0

Impacted Files	Coverage Δ
opwen_email_server/services/storage.py	96.37% <ø> (ø)
opwen_email_server/actions.py	95.89% <ø> (ø)
opwen_email_server/services/sendgrid.py	100% <100%> (ø)

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