FIX: make tst_pim_2 loadable, types.SimpleNamespace does not take positional args

[tangkong]

Description

In conftest.py, we defined a mock database with some SimpleNamespace devices.

Motivation and Context

Jane ran into this, uncovering a poorly written test (very likely my fault)

Many of the tests in happi are also quite brittle. I'd love to blame someone else for this but I did go through rewriting tests for click and did not fix this problem.

How Has This Been Tested?

pytest

Where Has This Been Documented?

This PR

Pre-merge checklist

• Code works interactively
• Code contains descriptive docstrings, including context and API
• New/changed functions and methods are covered in the test suite where possible
• Test suite passes locally
• Test suite passes on GitHub Actions
• Ran docs/pre-release-notes.sh and created a pre-release documentation page
• Pre-release docs include context, functional descriptions, and contributors as appropriate

[ZLLentz]

One way to make this specific test less brittle is to refactor so that the source dictionaries for the db fixtures are defined in an importable function that other tests can call and check the original source json with.