Execute the validate method in tests

[gadomski]

Related Issue(s): #339

Description: There were a few instances in the test suite where we wanted to validate an item, but the method wasn't actually called.

PR Checklist:

• Code is formatted (run scripts/format)
• Tests pass (run scripts/test)
• This PR maintains or improves overall codebase code coverage.
• Changes are added to the CHANGELOG. See the docs for information about adding to the changelog.

[codecov-commenter]

Codecov Report

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The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #346   +/-   ##
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  Coverage        ?   88.60%           
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  Files           ?       36           
  Lines           ?     4625           
  Branches        ?        0           
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  Hits            ?     4098           
  Misses          ?      527           
  Partials        ?        0           

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