typing - switch around node Definition usage

src/_pytest/doctest.py

@@ -420,7 +420,7 @@ class DoctestTextfile(Module):
     # todo: this shouldnt be a module
     obj: None = None  # type: ignore[assignment]
 
-    def collect(self) -> Iterable[DoctestItem]:
+    def collect(self) -> Iterable[DoctestItem]:  # type: ignore[override]
         import doctest
 
         # Inspired by doctest.testfile; ideally we would use it directly,
@@ -498,7 +498,7 @@ def _patch_unwrap_mock_aware() -> Generator[None, None, None]:
 
 
 class DoctestModule(Module):
-    def collect(self) -> Iterable[DoctestItem]:
+    def collect(self) -> Iterable[DoctestItem]:  # type: ignore[override]
         import doctest
 
         class MockAwareDocTestFinder(doctest.DocTestFinder):

src/_pytest/nodes.py

@@ -655,6 +655,11 @@ class Directory(FSCollector, abc.ABC):
     """
 
 
+class Definition(Collector, abc.ABC):
+    @abc.abstractmethod
+    def collect(self) -> Iterable[Item]: ...
+
+
 class Item(Node, abc.ABC):
     """Base class of all test invocation items.
 

src/_pytest/python.py

@@ -402,7 +402,7 @@ class PyCollector(PyobjMixin, nodes.Collector, abc.ABC):
                 return True
         return False
 
-    def collect(self) -> Iterable[nodes.Item | nodes.Collector]:
+    def collect(self) -> Iterable[nodes.Definition | nodes.Collector]:
         if not getattr(self.obj, "__test__", True):
             return []
 
@@ -415,10 +415,10 @@ class PyCollector(PyobjMixin, nodes.Collector, abc.ABC):
         # In each class, nodes should be definition ordered.
         # __dict__ is definition ordered.
         seen: set[str] = set()
-        dict_values: list[list[nodes.Item | nodes.Collector]] = []
+        dict_values: list[list[nodes.Definition | nodes.Collector]] = []
         ihook = self.ihook
         for dic in dicts:
-            values: list[nodes.Item | nodes.Collector] = []
+            values: list[nodes.Definition | nodes.Collector] = []
             # Note: seems like the dict can change during iteration -
             # be careful not to remove the list() without consideration.
             for name, obj in list(dic.items()):
@@ -564,7 +564,7 @@ class Module(nodes.File, PyCollector):
     def _getobj(self) -> types.ModuleType:
         return importtestmodule(self.path, self.config)
 
-    def collect(self) -> Iterable[nodes.Item | nodes.Collector]:
+    def collect(self) -> Iterable[nodes.Collector]:
         self._register_setup_module_fixture()
         self._register_setup_function_fixture()
         self.session._fixturemanager.parsefactories(self)
@@ -771,7 +771,7 @@ class Class(PyCollector):
     def newinstance(self) -> Any:
         return self.obj()
 
-    def collect(self) -> Iterable[nodes.Item | nodes.Collector]:
+    def collect(self) -> Iterable[nodes.Collector]:
         if not safe_getattr(self.obj, "__test__", True):
             return []
         if hasinit(self.obj):
@@ -1132,6 +1132,8 @@ class Metafunc:
     test function is defined.
     """
 
+    definition: FunctionDefinition
+
     def __init__(
         self,
         definition: FunctionDefinition,
@@ -1708,6 +1710,8 @@ class FunctionDefinition(Function):
     """This class is a stop gap solution until we evolve to have actual function
     definition nodes and manage to get rid of ``metafunc``."""
 
+    parent: Module | Class
+
     def runtest(self) -> None:
         raise RuntimeError("function definitions are not supposed to be run as tests")
 

src/_pytest/unittest.py

@@ -81,7 +81,7 @@ class UnitTestCase(Class):
         # it.
         return self.obj("runTest")
 
-    def collect(self) -> Iterable[Item | Collector]:
+    def collect(self) -> Iterable[Item | Collector]:  # type: ignore[override]
         from unittest import TestLoader
 
         cls = self.obj