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

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

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

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

Additional details and impacted files

```diff @@ 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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