chore: add tests for portions of PlayoutModelImpl SOFIE-2670

[Julusian]

About the Contributor

This pull request is posted on behalf of the NRK.

Type of Contribution

This is a: Code improvement

New Behavior

New unit tests

Other Information

Status

• PR is ready to be reviewed.
• The functionality has been tested by the author.
• Relevant unit tests has been added / updated.
• Relevant documentation (code comments, system documentation) has been added / updated.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 58.00%. Comparing base (748b7a0) to head (d2f12b6).
Report is 28 commits behind head on release51.

Additional details and impacted files

@@              Coverage Diff               @@
##           release51    #1164       +/-   ##
==============================================
- Coverage      82.87%   58.00%   -24.87%     
==============================================
  Files            169      518      +349     
  Lines          30001    83619    +53618     
  Branches        2487     4347     +1860     
==============================================
+ Hits           24864    48507    +23643     
- Misses          5133    35060    +29927     
- Partials           4       52       +48     

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