junitxml: Incorrect (?) file reported for inherited tests

[tpict]

When a class A inherits tests from a class B in another file, the test cases are reported as belonging to the file that houses class B.

Example:

# example/base.py

class Base:
    def test_something(self):
        assert 1 == 1

# example/test_something.py
from unittest import TestCase

from .base import Base

class MyTest(Base, TestCase):
    pass

> pytest -o junit_family=xunit1 --junit-xml=test.xml example/test_something.py
> cat test.xml
<?xml version="1.0" encoding="utf-8"?>
<testsuites>
  <testsuite name="pytest" errors="0" failures="0" skipped="0" tests="1" time="0.039" timestamp="2021-12-07T09:54:49.284569" hostname="hello">
    <testcase classname="example.test_something.MyTest" name="test_something" file="example/base.py" line="1" time="0.001" />
  </testsuite>
</testsuites>

I'm not sure if this is correct or not. In CircleCI, it prevents the "split tests by timing" feature from working correctly because it cannot find e.g. example/test_something.py in the XML doc. Is this intended? Is there a better method for inheriting tests?

> pip freeze
astroid==2.9.0
attrs==21.2.0
iniconfig==1.1.1
isort==5.10.1
lazy-object-proxy==1.6.0
mccabe==0.6.1
packaging==21.3
platformdirs==2.4.0
pluggy==1.0.0
py==1.11.0
pyparsing==3.0.6
pytest==6.2.5
toml==0.10.2
typing-extensions==4.0.1
wrapt==1.13.3

[tpict]

Not strictly related but I figure anyone with domain-specific knowledge can answer this too: functional tests have their classname set to the module containing them, not the function itself. This means that Circle cannot divide these tests any more granularly than by file, whereas class-based tests can be split by class (because the classname points to the class). Any idea why the discrepancy?