test: fix failing tests due to leaks

[JustinBeckwith]

I don't feel entirely great about the way I had to pollute the sample to make this actually work. Here's a TL;DR of what was happening:

• The same samples a local file with a list of alert policies
• The the tests add a bunch of things
• The sample restores the list of previous policies

This works great until you run the test twice at the same time :) We start creating a bunch of policies that leak from session to session, and eventually fill up.

[codecov]

Codecov Report

Merging #163 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff          @@
##           master   #163   +/-   ##
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  Coverage     100%   100%           
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  Files           1      1           
  Lines           4      4           
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  Hits            4      4

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