I tried to jump to a file shown in pytest text explorer by double clicking on the name of a test function in the tree view of the test explorer (I use PyCharm 2023.1.1, Community Edition):
However, instead of opening the corresponding file in the editor:
{project_root}/back_end/test/test_fuel_split.py
PyCharm jumps to a wrong location:
External Libraries => Python 3.10.5 => Lib => test
How can I fix that? Is there some PyCharm or pytest configuration I need to adapt? Or is this a PyCharm bug?

You will need to mark the
testsfolder as test sources in PyCharm inPreferences > Project Structure. They should appear green in the project explorer once this is configured correctly.