Missing unit tests for benchmarking circuits

[purva-thakre]

Description

Adds tests for 3 items in #2365

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License

• I license this contribution under the terms of the GNU GPL, version 3 and grant Unitary Fund the right to provide additional permissions as described in section 7 of the GNU GPL, version 3.

Before opening the PR, please ensure you have completed the following where appropriate.

• I added unit tests for new code.
• I used type hints in function signatures.
• I used Google-style docstrings for functions.
• I updated the documentation where relevant.
• Added myself / the copyright holder to the AUTHORS file

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.32%. Comparing base (7a7bbfd) to head (28093c4).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2366      +/-   ##
==========================================
+ Coverage   98.22%   98.32%   +0.09%     
==========================================
  Files          87       87              
  Lines        4059     4059              
==========================================
+ Hits         3987     3991       +4     
+ Misses         72       68       -4     

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[cosenal]

Thanks!
LGTM.