add test for dataset.pvnet

[peterdudfield]

Pull Request

Description

Add test for pvnet dataset
added test_data too

Fixes #

How Has This Been Tested?

CI tests + ran locally

• Yes

Checklist:

• My code follows OCF's coding style guidelines
• I have performed a self-review of my own code
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• I have checked my code and corrected any misspellings

[dfulu]

I'd prefer if we can use create data on the fly in tests as much as possible. I think its easier to maintain, but this is grand for now

[peterdudfield]

I'd prefer if we can use create data on the fly in tests as much as possible. I think its easier to maintain, but this is grand for now

Ill try and remake it now,