13403: Disable assertion rewriting for external modules - refactor AssertionRewriter

Author: Tusenka

src/_pytest/assertion/__init__.py

@@ -110,14 +110,9 @@ class AssertionState:
     def __init__(self, config: Config, mode) -> None:
         self.mode = mode
         self.trace = config.trace.root.get("assertion")
-        self.config = config
+        self.invocation_path = str(config.invocation_params.dir)
         self.hook: rewrite.AssertionRewritingHook | None = None
 
-    @property
-    def invocation_path(self):
-        """Get current root path (current working dir)"""
-        return str(self.config.invocation_params.dir)
-
 
 def install_importhook(config: Config) -> rewrite.AssertionRewritingHook:
     """Try to install the rewrite hook, raise SystemError if it fails."""

src/_pytest/pytester.py

@@ -12,7 +12,6 @@
 from collections.abc import Iterable
 from collections.abc import Sequence
 import contextlib
-import dataclasses
 from fnmatch import fnmatch
 import gc
 import importlib
@@ -41,6 +40,7 @@
 
 from _pytest import timing
 from _pytest._code import Source
+from _pytest.assertion.rewrite import assertstate_key
 from _pytest.capture import _get_multicapture
 from _pytest.compat import NOTSET
 from _pytest.compat import NotSetType
@@ -751,11 +751,7 @@ def chdir(self) -> None:
         """
         self._monkeypatch.chdir(self.path)
         self._monkeypatch.setattr(
-            self._request.config,
-            "invocation_params",
-            dataclasses.replace(
-                self._request.config.invocation_params, dir=Path(self._path)
-            ),
+            self._request.config.stash[assertstate_key], "invocation_path", self.path
         )
 
     def _makefile(