set unique fixtureinfo if it was changed from params marks

Author: ShurikMen

src/_pytest/compat.py

@@ -163,6 +163,7 @@ def getfuncargnames(
         and not isinstance(
             inspect.getattr_static(cls, name, default=None), staticmethod
         )
+        and not hasattr(function, "__self__")
     ):
         arg_names = arg_names[1:]
     # Remove any names that will be replaced with mocks.

src/_pytest/python.py

@@ -505,26 +505,14 @@ def _genfunctions(self, name: str, funcobj) -> Iterator["Function"]:
 
             for callspec in metafunc._calls:
                 subname = f"{name}[{callspec.id}]"
-                node = Function.from_parent(
+                yield Function.from_parent(
                     self,
                     name=subname,
                     callspec=callspec,
                     fixtureinfo=fixtureinfo,
                     keywords={callspec.id: True},
                     originalname=name,
                 )
-                # if usefixtures is added via a parameter, then there will be
-                # fixtures missing from the node.fixturenames
-                callspec_usefixtures = tuple(
-                    arg
-                    for mark in node.iter_markers(name="usefixtures")
-                    for arg in mark.args
-                    if arg not in node.fixturenames
-                )
-                if callspec_usefixtures:
-                    # node.fixturenames must be unique for this parameter
-                    node.fixturenames = [*node.fixturenames, *callspec_usefixtures]
-                yield node
 
 
 def importtestmodule(
@@ -1809,10 +1797,14 @@ def __init__(
         if keywords:
             self.keywords.update(keywords)
 
+        fixtureinfo_ = self.session._fixturemanager.getfixtureinfo(
+            self, self.obj, self.cls, funcargs=True
+        )
         if fixtureinfo is None:
-            fixtureinfo = self.session._fixturemanager.getfixtureinfo(
-                self, self.obj, self.cls, funcargs=True
-            )
+            fixtureinfo = fixtureinfo_
+        elif set(fixtureinfo_.names_closure) != set(fixtureinfo.names_closure):
+            fixtureinfo_.name2fixturedefs.update(fixtureinfo.name2fixturedefs)
+            fixtureinfo = fixtureinfo_
         self._fixtureinfo: FuncFixtureInfo = fixtureinfo
         self.fixturenames = fixtureinfo.names_closure
         self._initrequest()