add documentation for tests

[Dialgatrainer02]

Is your feature request related to a problem? Please describe.
A clear and concise description of what the problem is. Ex. I'm always frustrated when <...>
i want to be able to test my terraform modules that use this provider however as its such a new feature in terraform/tofu there isn't any good documentation especially with this provider ive tried but kept on running into issues and would like some more documentation

Describe the solution you'd like
A clear and concise description of what you want to happen.

give examples on how to write tests with the provider: how to test a vm is created properly and mock resources and data eg spoofing the available nodes so there not reliant on existing infrastructure.
also potentially having a way to bypass authentication for fully offline tests when mocking the provider eg https://registry.terraform.io/providers/hashicorp/aws/latest/docs#skip_credentials_validation-1

Describe alternatives you've considered
A clear and concise description of any alternative solutions or features you've considered.
ive looked at terratest but i have no go experience and it would be a significant venture especially when first party tools are available

Additional context
Add any other context or screenshots about the feature request here.