feat: add unit tests on exec command

[acesyde]

Description

• Add some unit tests on the exec command before improve it
• Merge the current ignore file with the official
• Upgrade Microsoft.NET.Test.Sdk / Coverlet / FluentAssertions

Fixes # (issue)

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist

• I have performed a self-review of my code
• I have added tests that prove my fix is effective or that my feature works
• I have made corresponding changes to the documentation
• I have commented my code, particularly in hard-to-understand areas
• New and existing unit tests pass locally with my changes
• I did test corresponding changes on Windows
• I did test corresponding changes on Linux
• I did test corresponding changes on Mac

[alirezanet]

Great. thanks 👌💐