Fix Disposables not disposed in test

[ChrisPulman]

What kind of change does this PR introduce?

FIx

What is the current behaviour?

Test failing to build

What is the new behaviour?

Fixed issue with build

What might this PR break?

none

Please check if the PR fulfils these requirements

• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

Other information:

[codecov]

Codecov Report

Base: 63.60% // Head: 63.60% // No change to project coverage 👍

Coverage data is based on head (598dbad) compared to base (eebbacf).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3385   +/-   ##
=======================================
  Coverage   63.60%   63.60%           
=======================================
  Files         157      157           
  Lines        5768     5768           
=======================================
  Hits         3669     3669           
  Misses       2099     2099           

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[github-actions]

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