Add tests for py bindings

[sovrasov]

What does this PR do?

Now the tests just check basic conformance. To be extended after the bindings become more advanced.
This is a temporal solution until we finally sort out py-cpp relationships

Fixes # (issue)

Before submitting

• This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).
• Did you make sure to update the documentation with your changes?
• Did you write any new necessary tests?

[sovrasov]

#287