Add basic unit test support for session

[damianoneill]

fix: resolve environment variable type conversion and privileges iteration bugs

• Fix environment variable type handling in _load_env()

  • Convert CONSOLE_LOG_LEVEL and LOGGING_LOG_LEVEL from string to int
  • Add proper error handling with fallback defaults
  • Resolves TypeError when comparing string env vars to int values

• Fix Privileges object iteration in get_privilege_by_org_id()

  • Access privileges.privileges list instead of iterating Privileges object directly
  • Use priv.org_id attribute access instead of dict-style priv.get('org_id')
  • Return properly formatted dict for backwards compatibility
  • Resolves 'TypeError: Privileges object is not iterable'

• Fix double Privileges wrapping in str method

  • Check if self.privileges is already a Privileges instance before wrapping
  • Prevents TypeError in string representation

• Improve code formatting and consistency per PEP 8

[damianoneill]

@tmunzer consider this draft at the moment for discussion.

Valid tests for session, identified a few minor issues, included fixes. Can you check and run and validate fixes don't impact any other behaviour?

For discussion:

• use of a tool look uv so that deps can be managed better?
• I've placeholders in for the other unit test code, its probably better that these are added later as async support is added.
• Would be good once point 1 is considered to include a github action for running the tests / coverage on MRs/pushes.

[tmunzer]

Thanks @damianoneill !

Everything should be Ok, except for

Use priv.org_id attribute access instead of dict-style priv.get('org_id')

I think this may cause an issue in some condition (the org_id "may" not be present for some admin/orgs). I need to double check it.

--
regarding the next steps you listed:

• use of a tool look uv so that deps can be managed better?

Yes, didn't took the time for that yet

• I've placeholders in for the other unit test code, its probably better that these are added later as async support is added.

Agree, I stated to look at that last week, I just want to be sure to not break any use of this tool by partners. Default behavior should stay the current one, but async option should be proposed.

• Would be good once point 1 is considered to include a github action for running the tests / coverage on MRs/pushes.

agree