Fix assert raises tests

[billingsley-john]

Proposed changes

PR which re-organises unit tests so that assertions are correctly tested, and we don't get incorrect 'spillover' from previous tests.

Types of changes

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• Bugfix (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)
• Code refactoring
• Documentation Update (if none of the other choices apply)
• New tests

Checklist

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• Pep8 applied
• Unit tests pass locally with my changes
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)

Further comments

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[codecov]

Codecov Report

Merging #681 (9299e01) into develop_combine (8d5d493) will increase coverage by 0.02%.
The diff coverage is n/a.

@@                 Coverage Diff                 @@
##           develop_combine     #681      +/-   ##
===================================================
+ Coverage            99.05%   99.07%   +0.02%     
===================================================
  Files                   68       68              
  Lines                 4222     4222              
===================================================
+ Hits                  4182     4183       +1     
+ Misses                  40       39       -1     

Impacted Files	Coverage Δ
...ric_components/center_column_flat_top_hyperbola.py	100.00% <0.00%> (+2.12%)	⬆️

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