unit test for sim_cat

[khawajasim]

pyCSEP Pull Request Checklist

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Fixes issue #(please fill in or delete if not needed).

Type of change:

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update (this pull request adds no new code)
• Unpublished science feature (This may require a science review)
• This change requires a documentation update

Checklist:

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

[codecov-commenter]

Codecov Report

❗ No coverage uploaded for pull request base (v0.6.1-release-branch@76844eb). Click here to learn what that means.
Patch has no changes to coverable lines.

Additional details and impacted files

@@                   Coverage Diff                    @@
##             v0.6.1-release-branch     #209   +/-   ##
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  Coverage                         ?   55.32%           
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  Files                            ?       20           
  Lines                            ?     3664           
  Branches                         ?      539           
========================================================
  Hits                             ?     2027           
  Misses                           ?     1514           
  Partials                         ?      123           

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