[Tests] Add Unit Tests for Configuration Models

[DotDev262]

Our configuration models in src/Models need simple unit tests for serialization and defaults.

Tasks:

• Create tests/WinHome.Tests/ModelTests.cs.
• Test AppConfig, GitConfig, and WslConfig.

[github-actions]

🤖 Hi @DotDev262, I've received your request, and I'm working on it now! You can track my progress in the logs for more details.

[github-actions]

🤖 I'm sorry @DotDev262, but I was unable to process your request. Please see the logs for more details.

[sanjeta-singh]

Hi @DotDev262 , im interested in contributing to this issue. Could you please assign it to me ?

[DotDev262]

Please finish your assigned task first

[Pooqdmk]

Hi @DotDev262, I'd love to take this up. I have experience with xUnit and Fluent Assertions, and these configuration model tests look like a great fit. Could you please assign this issue to me?

[DotDev262]

Sure you can work on it