Define FakeSession as a fixture

[stveit]

Fixes #2841

Only reasonable way to share code like this between files is via a fixture afaik. Could have defined the fixture to return the class itself and not an instance of the class, but that felt weird. This should work fine

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 57.14%. Comparing base (dff1b0c) to head (504ae38).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2842   +/-   ##
=======================================
  Coverage   57.14%   57.14%           
=======================================
  Files         567      567           
  Lines       41275    41268    -7     
=======================================
- Hits        23585    23584    -1     
+ Misses      17690    17684    -6     

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[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

See analysis details on SonarCloud