Add additional test coverage

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 95.23810% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 68.48%. Comparing base (aae7921) to head (764fbfe).

Files	Patch %	Lines
...iff/SailDiffAnalysisCompleteNotificationHandler.cs	66.66%	0 Missing and 1 partial :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #174 +/- ## ========================================== + Coverage 67.49% 68.48% +0.98% ========================================== Files 322 321 -1 Lines 8568 8566 -2 Branches 966 967 +1 ========================================== + Hits 5783 5866 +83 + Misses 2471 2384 -87 - Partials 314 316 +2 ```

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