refactor: Addressed warnings about missing default fixture loop scope in test_doctest.

Author: seifertm

tests/test_doctest.py

@@ -4,6 +4,7 @@
 
 
 def test_plugin_does_not_interfere_with_doctest_collection(pytester: Pytester):
+    pytester.makeini("[pytest]\nasyncio_default_fixture_loop_scope = function")
     pytester.makepyfile(
         dedent(
             '''\
@@ -20,6 +21,7 @@ def any_function():
 
 
 def test_plugin_does_not_interfere_with_doctest_textfile_collection(pytester: Pytester):
+    pytester.makeini("[pytest]\nasyncio_default_fixture_loop_scope = function")
     pytester.makefile(".txt", "")  # collected as DoctestTextfile
     pytester.makepyfile(
         __init__="",