Support pytest 8.1+ changes in pytest plugin (#14441)

Pytest 8.1 has also changed the plugin API, as well as required new
keyword arguments. I've shifted the pytest version calculation to the
module level so we can use it everywhere, and continue supporting all
versions of pytest that we can.

Fixes  #14390

IPython/testing/plugin/pytest_ipdoctest.py

@@ -38,7 +38,11 b' from _pytest._io import TerminalWriter'
 from _pytest.compat import safe_getattr
 from _pytest.config import Config
 from _pytest.config.argparsing import Parser
-from _pytest.fixtures import FixtureRequest
+
+try:
+    from _pytest.fixtures import TopRequest as FixtureRequest
+except ImportError:
+    from _pytest.fixtures import FixtureRequest
 from _pytest.nodes import Collector
 from _pytest.outcomes import OutcomeException
 from _pytest.pathlib import fnmatch_ex, import_path
@@ -69,6 +73,8 b' RUNNER_CLASS = None'
 # Lazy definition of output checker class
 CHECKER_CLASS: Optional[Type["IPDoctestOutputChecker"]] = None
 
+pytest_version = tuple([int(part) for part in pytest.__version__.split(".")])
+
 
 def pytest_addoption(parser: Parser) -> None:
     parser.addini(
@@ -143,7 +149,7 b' def pytest_collect_file('
     return None
 
 
-if int(pytest.__version__.split(".")[0]) < 7:
+if pytest_version[0] < 7:
     _collect_file = pytest_collect_file
 
     def pytest_collect_file(
@@ -448,7 +454,7 b' class IPDoctestItem(pytest.Item):'
         assert self.dtest is not None
         return self.path, self.dtest.lineno, "[ipdoctest] %s" % self.name
 
-    if int(pytest.__version__.split(".")[0]) < 7:
+    if pytest_version[0] < 7:
 
         @property
         def path(self) -> Path:
@@ -521,7 +527,7 b' class IPDoctestTextfile(pytest.Module):'
                 self, name=test.name, runner=runner, dtest=test
             )
 
-    if int(pytest.__version__.split(".")[0]) < 7:
+    if pytest_version[0] < 7:
 
         @property
         def path(self) -> Path:
@@ -636,20 +642,26 b' class IPDoctestModule(pytest.Module):'
                     )
 
         if self.path.name == "conftest.py":
-            if int(pytest.__version__.split(".")[0]) < 7:
+            if pytest_version[0] < 7:
                 module = self.config.pluginmanager._importconftest(
                     self.path,
                     self.config.getoption("importmode"),
                 )
             else:
+                kwargs = {"rootpath": self.config.rootpath}
+                if pytest_version >= (8, 1):
+                    kwargs["consider_namespace_packages"] = False
                 module = self.config.pluginmanager._importconftest(
                     self.path,
                     self.config.getoption("importmode"),
-                    rootpath=self.config.rootpath,
+                    **kwargs,
                 )
         else:
             try:
-                module = import_path(self.path, root=self.config.rootpath)
+                kwargs = {"root": self.config.rootpath}
+                if pytest_version >= (8, 1):
+                    kwargs["consider_namespace_packages"] = False
+                module = import_path(self.path, **kwargs)
             except ImportError:
                 if self.config.getvalue("ipdoctest_ignore_import_errors"):
                     pytest.skip("unable to import module %r" % self.path)
@@ -671,7 +683,7 b' class IPDoctestModule(pytest.Module):'
                     self, name=test.name, runner=runner, dtest=test
                 )
 
-    if int(pytest.__version__.split(".")[0]) < 7:
+    if pytest_version[0] < 7:
 
         @property
         def path(self) -> Path:
@@ -701,11 +713,15 b' def _setup_fixtures(doctest_item: IPDoctestItem) -> FixtureRequest:'
 
     doctest_item.funcargs = {}  # type: ignore[attr-defined]
     fm = doctest_item.session._fixturemanager
+    kwargs = {"node": doctest_item, "func": func, "cls": None}
+    if pytest_version <= (8, 0):
+        kwargs["funcargs"] = False
     doctest_item._fixtureinfo = fm.getfixtureinfo(  # type: ignore[attr-defined]
-        node=doctest_item, func=func, cls=None, funcargs=False
+        **kwargs
     )
     fixture_request = FixtureRequest(doctest_item, _ispytest=True)
-    fixture_request._fillfixtures()
+    if pytest_version <= (8, 0):
+        fixture_request._fillfixtures()
     return fixture_request