test leftover process detection

tests/conftest.py

@@ -5,8 +5,8 @@
 import pytest
 
 
-@pytest.fixture(autouse=True)
-def check_subprocesses():
+@pytest.fixture(autouse=True, scope='module')
+def check_subprocesses(request, capsys):
     # Get a list of child PIDs before the test starts
     parent = psutil.Process(os.getpid())
     before_children = {child.pid for child in parent.children(recursive=True)}
@@ -20,4 +20,6 @@ def check_subprocesses():
         leftover_details = [
             f"PID {p.pid}: {p.cmdline()}" for p in parent.children(recursive=True) if p.pid in leftover_processes
         ]
-        pytest.fail(f"Lingering subprocesses detected:\n" + "\n".join(leftover_details))
+        with capsys.disabled():
+            print(f"Lingering subprocesses detected:\n" + "\n".join(leftover_details))
+        pytest.fail()