Automated activation test needed for AppNotificationBuilder

[pmpurifoy]

Describe the bug

Testing argument decoding has to be done manually to verify behavior. Filing an issue to fill this gap in the future.

Steps to reproduce the bug

No automated unit test for validation.

Expected behavior

No response

Screenshots

No response

NuGet package version

No response

Packaging type

No response

Windows version

No response

IDE

No response

Additional context

No response