cleanup temporary file in test

[jmborr]

Fixes #24

Code Review

• [ ] Is the code of an acceptable quality?
• [ ] Does the code conform to the [coding standards]?
• [ ] Are the unit tests small and test the class in isolation?
• [ ] If there are changes in the release notes then do they describe the changes appropriately?

Functional Tests

• [ ] Do changes function as described? Add comments below that describe the tests performed?
• [ ] Do the changes handle unexpected situations, e.g. bad input?
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[codecov-io]

Codecov Report

:exclamation: No coverage uploaded for pull request base (master@2ae26f2). Click here to learn what that means. The diff coverage is n/a.

@@            Coverage Diff            @@
##             master      #25   +/-   ##
=========================================
  Coverage          ?   83.38%           
=========================================
  Files             ?        7           
  Lines             ?      349           
  Branches          ?        0           
=========================================
  Hits              ?      291           
  Misses            ?       58           
  Partials          ?        0

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