Add more Unit tests for the `notifications` package

[andrii-bodnar]

The notifications package has low code coverage by Unit tests. We need to add more Unit tests to cover the code.

References:

• Source code
• Existing Unit tests
• Actual coverage

[techrajdeep]

Hi @andrii-bodnar ,Please let me know ..if it is still open

[andrii-bodnar]

Hi @techrajdeep, it's available, assigning it to you

[andrii-bodnar]

Hi @techrajdeep, any updates on this?

[PickBas]

@andrii-bodnar Hello. If this issue is still available, could you please assign it to me?

[andrii-bodnar]

@PickBas sure, thank you!