Fix unit tests

[callumforrester]

Fix unit tests by defining the path provider in a fixture, this is needed pending DiamondLightSource/dodal#1129

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (7c22096) to head (bfa21e0).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main       #15   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            3         3           
  Lines           34        33    -1     
=========================================
- Hits            34        33    -1     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[GDYendell]

Something I was wondering: is there any reason to use the decorator on snapshot but not spectroscopy?

[callumforrester]

As it is spectroscopy is calling spec_scan, which has the decorator. snapshot is calling bluesky.plans.count, which does not, so it needs its own. You could instead make it call dodal.plans.count, which is just a decorated wrapper. However now we're using numtracker the decorator is also a no-op so we can actually just get rid of it.