refactor: cleanup code across fakes and tests

[PepperPix]

No description provided.

[github-actions]

Qodana Community for .NET

7 new problems were found

Inspection name	Severity	Problems
Nullability of type argument doesn't match constraint type.	🔶 Warning	2
Use object or collection initializer when possible	◽️ Notice	4
Use collection expression syntax	◽️ Notice	1

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