Add SPH tests

[aartiukh]

What does this PR do?

Add SPH tests

Explanation

To increase code coverage.

How to get?

git clone --recursive -b add-tests [email protected]:aartiukh/sph.git

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.31%. Comparing base (4c1ad92) to head (3047e7f).
Report is 1 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop      #56      +/-   ##
===========================================
+ Coverage    90.45%   96.31%   +5.85%     
===========================================
  Files           15       15              
  Lines          461      461              
===========================================
+ Hits           417      444      +27     
+ Misses          44       17      -27     

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