diff --git a/src/_pytest/my_pathlib.py b/src/_pytest/my_pathlib.py
new file mode 100644
index 000000000..b11eea4e7
--- /dev/null
+++ b/src/_pytest/my_pathlib.py
@@ -0,0 +1,984 @@
+import atexit
+import contextlib
+from enum import Enum
+from errno import EBADF
+from errno import ELOOP
+from errno import ENOENT
+from errno import ENOTDIR
+import fnmatch
+from functools import partial
+from importlib.machinery import ModuleSpec
+import importlib.util
+import itertools
+import os
+from os.path import expanduser
+from os.path import expandvars
+from os.path import isabs
+from os.path import sep
+from pathlib import Path
+from pathlib import PurePath
+from posixpath import sep as posix_sep
+import shutil
+import sys
+import types
+from types import ModuleType
+from typing import Any
+from typing import Callable
+from typing import Dict
+from typing import Iterable
+from typing import Iterator
+from typing import List
+from typing import Optional
+from typing import Set
+from typing import Tuple
+from typing import Type
+from typing import TypeVar
+from typing import Union
+import uuid
+import warnings
+
+from _pytest.compat import assert_never
+from _pytest.outcomes import skip
+from _pytest.warning_types import PytestWarning
+
+
+LOCK_TIMEOUT = 60 * 60 * 24 * 3
+
+
+_AnyPurePath = TypeVar("_AnyPurePath", bound=PurePath)
+
+# The following function, variables and comments were
+# copied from cpython 3.9 Lib/pathlib.py file.
+
+# EBADF - guard against macOS `stat` throwing EBADF
+_IGNORED_ERRORS = (ENOENT, ENOTDIR, EBADF, ELOOP)
+
+_IGNORED_WINERRORS = (
+    21,  # ERROR_NOT_READY - drive exists but is not accessible
+    1921,  # ERROR_CANT_RESOLVE_FILENAME - fix for broken symlink pointing to itself
+)
+
+
+def _ignore_error(exception: Exception) -> bool:
+    return (
+        getattr(exception, "errno", None) in _IGNORED_ERRORS
+        or getattr(exception, "winerror", None) in _IGNORED_WINERRORS
+    )
+
+
+def get_lock_path(path: _AnyPurePath) -> _AnyPurePath:
+    return path.joinpath(".lock")
+
+
+def on_rm_rf_error(
+    func: Optional[Callable[..., Any]],
+    path: str,
+    excinfo: Union[
+        BaseException,
+        Tuple[Type[BaseException], BaseException, Optional[types.TracebackType]],
+    ],
+    *,
+    start_path: Path,
+) -> bool:
+    """Handle known read-only errors during rmtree.
+
+    The returned value is used only by our own tests.
+    """
+    if isinstance(excinfo, BaseException):
+        exc = excinfo
+    else:
+        exc = excinfo[1]
+
+    # Another process removed the file in the middle of the "rm_rf" (xdist for example).
+    # More context: https://github.com/pytest-dev/pytest/issues/5974#issuecomment-543799018
+    if isinstance(exc, FileNotFoundError):
+        return False
+
+    if not isinstance(exc, PermissionError):
+        warnings.warn(
+            PytestWarning(f"(rm_rf) error removing {path}\n{type(exc)}: {exc}")
+        )
+        return False
+
+    if func not in (os.rmdir, os.remove, os.unlink):
+        if func not in (os.open,):
+            warnings.warn(
+                PytestWarning(
+                    f"(rm_rf) unknown function {func} when removing {path}:\n{type(exc)}: {exc}"
+                )
+            )
+        return False
+
+    # Chmod + retry.
+    import stat
+
+    def chmod_rw(p: str) -> None:
+        mode = os.stat(p).st_mode
+        os.chmod(p, mode | stat.S_IRUSR | stat.S_IWUSR)
+
+    # For files, we need to recursively go upwards in the directories to
+    # ensure they all are also writable.
+    p = Path(path)
+    if p.is_file():
+        for parent in p.parents:
+            chmod_rw(str(parent))
+            # Stop when we reach the original path passed to rm_rf.
+            if parent == start_path:
+                break
+    chmod_rw(str(path))
+
+    func(path)
+    return True
+
+
+def ensure_extended_length_path(path: Path) -> Path:
+    """Get the extended-length version of a path (Windows).
+
+    On Windows, by default, the maximum length of a path (MAX_PATH) is 260
+    characters, and operations on paths longer than that fail. But it is possible
+    to overcome this by converting the path to "extended-length" form before
+    performing the operation:
+    https://docs.microsoft.com/en-us/windows/win32/fileio/naming-a-file#maximum-path-length-limitation
+
+    On Windows, this function returns the extended-length absolute version of path.
+    On other platforms it returns path unchanged.
+    """
+    if sys.platform.startswith("win32"):
+        path = path.resolve()
+        path = Path(get_extended_length_path_str(str(path)))
+    return path
+
+
+def get_extended_length_path_str(path: str) -> str:
+    """Convert a path to a Windows extended length path."""
+    long_path_prefix = "\\\\?\\"
+    unc_long_path_prefix = "\\\\?\\UNC\\"
+    if path.startswith((long_path_prefix, unc_long_path_prefix)):
+        return path
+    # UNC
+    if path.startswith("\\\\"):
+        return unc_long_path_prefix + path[2:]
+    return long_path_prefix + path
+
+
+def rm_rf(path: Path) -> None:
+    """Remove the path contents recursively, even if some elements
+    are read-only."""
+    path = ensure_extended_length_path(path)
+    onerror = partial(on_rm_rf_error, start_path=path)
+    if sys.version_info >= (3, 12):
+        shutil.rmtree(str(path), onexc=onerror)
+    else:
+        shutil.rmtree(str(path), onerror=onerror)
+
+
+def find_prefixed(root: Path, prefix: str) -> Iterator["os.DirEntry[str]"]:
+    """Find all elements in root that begin with the prefix, case-insensitive."""
+    l_prefix = prefix.lower()
+    for x in os.scandir(root):
+        if x.name.lower().startswith(l_prefix):
+            yield x
+
+
+def extract_suffixes(iter: Iterable["os.DirEntry[str]"], prefix: str) -> Iterator[str]:
+    """Return the parts of the paths following the prefix.
+
+    :param iter: Iterator over path names.
+    :param prefix: Expected prefix of the path names.
+    """
+    p_len = len(prefix)
+    for entry in iter:
+        yield entry.name[p_len:]
+
+
+def find_suffixes(root: Path, prefix: str) -> Iterator[str]:
+    """Combine find_prefixes and extract_suffixes."""
+    return extract_suffixes(find_prefixed(root, prefix), prefix)
+
+
+def parse_num(maybe_num: str) -> int:
+    """Parse number path suffixes, returns -1 on error."""
+    try:
+        return int(maybe_num)
+    except ValueError:
+        return -1
+
+
+def _force_symlink(
+    root: Path, target: Union[str, PurePath], link_to: Union[str, Path]
+) -> None:
+    """Helper to create the current symlink.
+
+    It's full of race conditions that are reasonably OK to ignore
+    for the context of best effort linking to the latest test run.
+
+    The presumption being that in case of much parallelism
+    the inaccuracy is going to be acceptable.
+    """
+    current_symlink = root.joinpath(target)
+    try:
+        current_symlink.unlink()
+    except OSError:
+        pass
+    try:
+        current_symlink.symlink_to(link_to)
+    except Exception:
+        pass
+
+
+def make_numbered_dir(root: Path, prefix: str, mode: int = 0o700) -> Path:
+    """Create a directory with an increased number as suffix for the given prefix."""
+    for i in range(10):
+        # try up to 10 times to create the folder
+        max_existing = max(map(parse_num, find_suffixes(root, prefix)), default=-1)
+        new_number = max_existing + 1
+        new_path = root.joinpath(f"{prefix}{new_number}")
+        try:
+            new_path.mkdir(mode=mode)
+        except Exception:
+            pass
+        else:
+            _force_symlink(root, prefix + "current", new_path)
+            return new_path
+    else:
+        raise OSError(
+            "could not create numbered dir with prefix "
+            f"{prefix} in {root} after 10 tries"
+        )
+
+
+def create_cleanup_lock(p: Path) -> Path:
+    """Create a lock to prevent premature folder cleanup."""
+    lock_path = get_lock_path(p)
+    try:
+        fd = os.open(str(lock_path), os.O_WRONLY | os.O_CREAT | os.O_EXCL, 0o644)
+    except FileExistsError as e:
+        raise OSError(f"cannot create lockfile in {p}") from e
+    else:
+        pid = os.getpid()
+        spid = str(pid).encode()
+        os.write(fd, spid)
+        os.close(fd)
+        if not lock_path.is_file():
+            raise OSError("lock path got renamed after successful creation")
+        return lock_path
+
+
+def register_cleanup_lock_removal(
+    lock_path: Path, register: Any = atexit.register
+) -> Any:
+    """Register a cleanup function for removing a lock, by default on atexit."""
+    pid = os.getpid()
+
+    def cleanup_on_exit(lock_path: Path = lock_path, original_pid: int = pid) -> None:
+        current_pid = os.getpid()
+        if current_pid != original_pid:
+            # fork
+            return
+        try:
+            lock_path.unlink()
+        except OSError:
+            pass
+
+    return register(cleanup_on_exit)
+
+
+def maybe_delete_a_numbered_dir(path: Path) -> None:
+    """Remove a numbered directory if its lock can be obtained and it does
+    not seem to be in use."""
+    path = ensure_extended_length_path(path)
+    lock_path = None
+    try:
+        lock_path = create_cleanup_lock(path)
+        parent = path.parent
+
+        garbage = parent.joinpath(f"garbage-{uuid.uuid4()}")
+        path.rename(garbage)
+        rm_rf(garbage)
+    except OSError:
+        #  known races:
+        #  * other process did a cleanup at the same time
+        #  * deletable folder was found
+        #  * process cwd (Windows)
+        return
+    finally:
+        # If we created the lock, ensure we remove it even if we failed
+        # to properly remove the numbered dir.
+        if lock_path is not None:
+            try:
+                lock_path.unlink()
+            except OSError:
+                pass
+
+
+def ensure_deletable(path: Path, consider_lock_dead_if_created_before: float) -> bool:
+    """Check if `path` is deletable based on whether the lock file is expired."""
+    if path.is_symlink():
+        return False
+    lock = get_lock_path(path)
+    try:
+        if not lock.is_file():
+            return True
+    except OSError:
+        # we might not have access to the lock file at all, in this case assume
+        # we don't have access to the entire directory (#7491).
+        return False
+    try:
+        lock_time = lock.stat().st_mtime
+    except Exception:
+        return False
+    else:
+        if lock_time < consider_lock_dead_if_created_before:
+            # We want to ignore any errors while trying to remove the lock such as:
+            # - PermissionDenied, like the file permissions have changed since the lock creation;
+            # - FileNotFoundError, in case another pytest process got here first;
+            # and any other cause of failure.
+            with contextlib.suppress(OSError):
+                lock.unlink()
+                return True
+        return False
+
+
+def try_cleanup(path: Path, consider_lock_dead_if_created_before: float) -> None:
+    """Try to cleanup a folder if we can ensure it's deletable."""
+    if ensure_deletable(path, consider_lock_dead_if_created_before):
+        maybe_delete_a_numbered_dir(path)
+
+
+def cleanup_candidates(root: Path, prefix: str, keep: int) -> Iterator[Path]:
+    """List candidates for numbered directories to be removed - follows py.path."""
+    max_existing = max(map(parse_num, find_suffixes(root, prefix)), default=-1)
+    max_delete = max_existing - keep
+    entries = find_prefixed(root, prefix)
+    entries, entries2 = itertools.tee(entries)
+    numbers = map(parse_num, extract_suffixes(entries2, prefix))
+    for entry, number in zip(entries, numbers):
+        if number <= max_delete:
+            yield Path(entry)
+
+
+def cleanup_dead_symlinks(root: Path) -> None:
+    for left_dir in root.iterdir():
+        if left_dir.is_symlink():
+            if not left_dir.resolve().exists():
+                left_dir.unlink()
+
+
+def cleanup_numbered_dir(
+    root: Path, prefix: str, keep: int, consider_lock_dead_if_created_before: float
+) -> None:
+    """Cleanup for lock driven numbered directories."""
+    if not root.exists():
+        return
+    for path in cleanup_candidates(root, prefix, keep):
+        try_cleanup(path, consider_lock_dead_if_created_before)
+    for path in root.glob("garbage-*"):
+        try_cleanup(path, consider_lock_dead_if_created_before)
+
+    cleanup_dead_symlinks(root)
+
+
+def make_numbered_dir_with_cleanup(
+    root: Path,
+    prefix: str,
+    keep: int,
+    lock_timeout: float,
+    mode: int,
+) -> Path:
+    """Create a numbered dir with a cleanup lock and remove old ones."""
+    e = None
+    for i in range(10):
+        try:
+            p = make_numbered_dir(root, prefix, mode)
+            # Only lock the current dir when keep is not 0
+            if keep != 0:
+                lock_path = create_cleanup_lock(p)
+                register_cleanup_lock_removal(lock_path)
+        except Exception as exc:
+            e = exc
+        else:
+            consider_lock_dead_if_created_before = p.stat().st_mtime - lock_timeout
+            # Register a cleanup for program exit
+            atexit.register(
+                cleanup_numbered_dir,
+                root,
+                prefix,
+                keep,
+                consider_lock_dead_if_created_before,
+            )
+            return p
+    assert e is not None
+    raise e
+
+
+def resolve_from_str(input: str, rootpath: Path) -> Path:
+    input = expanduser(input)
+    input = expandvars(input)
+    if isabs(input):
+        return Path(input)
+    else:
+        return rootpath.joinpath(input)
+
+
+def fnmatch_ex(pattern: str, path: Union[str, "os.PathLike[str]"]) -> bool:
+    """A port of FNMatcher from py.path.common which works with PurePath() instances.
+
+    The difference between this algorithm and PurePath.match() is that the
+    latter matches "**" glob expressions for each part of the path, while
+    this algorithm uses the whole path instead.
+
+    For example:
+        "tests/foo/bar/doc/test_foo.py" matches pattern "tests/**/doc/test*.py"
+        with this algorithm, but not with PurePath.match().
+
+    This algorithm was ported to keep backward-compatibility with existing
+    settings which assume paths match according this logic.
+
+    References:
+    * https://bugs.python.org/issue29249
+    * https://bugs.python.org/issue34731
+    """
+    path = PurePath(path)
+    iswin32 = sys.platform.startswith("win")
+
+    if iswin32 and sep not in pattern and posix_sep in pattern:
+        # Running on Windows, the pattern has no Windows path separators,
+        # and the pattern has one or more Posix path separators. Replace
+        # the Posix path separators with the Windows path separator.
+        pattern = pattern.replace(posix_sep, sep)
+
+    if sep not in pattern:
+        name = path.name
+    else:
+        name = str(path)
+        if path.is_absolute() and not os.path.isabs(pattern):
+            pattern = f"*{os.sep}{pattern}"
+    return fnmatch.fnmatch(name, pattern)
+
+
+def parts(s: str) -> Set[str]:
+    parts = s.split(sep)
+    return {sep.join(parts[: i + 1]) or sep for i in range(len(parts))}
+
+
+def symlink_or_skip(
+    src: Union["os.PathLike[str]", str],
+    dst: Union["os.PathLike[str]", str],
+    **kwargs: Any,
+) -> None:
+    """Make a symlink, or skip the test in case symlinks are not supported."""
+    try:
+        os.symlink(src, dst, **kwargs)
+    except OSError as e:
+        skip(f"symlinks not supported: {e}")
+
+
+class ImportMode(Enum):
+    """Possible values for `mode` parameter of `import_path`."""
+
+    prepend = "prepend"
+    append = "append"
+    importlib = "importlib"
+
+
+class ImportPathMismatchError(ImportError):
+    """Raised on import_path() if there is a mismatch of __file__'s.
+
+    This can happen when `import_path` is called multiple times with different filenames that has
+    the same basename but reside in packages
+    (for example "/tests1/test_foo.py" and "/tests2/test_foo.py").
+    """
+
+
+def import_path(
+    path: Union[str, "os.PathLike[str]"],
+    *,
+    mode: Union[str, ImportMode] = ImportMode.prepend,
+    root: Path,
+    consider_namespace_packages: bool,
+) -> ModuleType:
+    """
+    Import and return a module from the given path, which can be a file (a module) or
+    a directory (a package).
+
+    :param path:
+        Path to the file to import.
+
+    :param mode:
+        Controls the underlying import mechanism that will be used:
+
+        * ImportMode.prepend: the directory containing the module (or package, taking
+          `__init__.py` files into account) will be put at the *start* of `sys.path` before
+          being imported with `importlib.import_module`.
+
+        * ImportMode.append: same as `prepend`, but the directory will be appended
+          to the end of `sys.path`, if not already in `sys.path`.
+
+        * ImportMode.importlib: uses more fine control mechanisms provided by `importlib`
+          to import the module, which avoids having to muck with `sys.path` at all. It effectively
+          allows having same-named test modules in different places.
+
+    :param root:
+        Used as an anchor when mode == ImportMode.importlib to obtain
+        a unique name for the module being imported so it can safely be stored
+        into ``sys.modules``.
+
+    :param consider_namespace_packages:
+        If True, consider namespace packages when resolving module names.
+
+    :raises ImportPathMismatchError:
+        If after importing the given `path` and the module `__file__`
+        are different. Only raised in `prepend` and `append` modes.
+    """
+    path = Path(path)
+    mode = ImportMode(mode)
+
+    if not path.exists():
+        raise ImportError(path)
+
+    if mode is ImportMode.importlib:
+        # Try to import this module using the standard import mechanisms, but
+        # without touching sys.path.
+        try:
+            pkg_root, module_name = resolve_pkg_root_and_module_name(
+                path, consider_namespace_packages=consider_namespace_packages
+            )
+        except CouldNotResolvePathError:
+            pass
+        else:
+            # If the given module name is already in sys.modules, do not import it again.
+            with contextlib.suppress(KeyError):
+                return sys.modules[module_name]
+
+            mod = _import_module_using_spec(
+                module_name, path, pkg_root, insert_modules=False
+            )
+            if mod is not None:
+                return mod
+
+        # Could not import the module with the current sys.path, so we fall back
+        # to importing the file as a single module, not being a part of a package.
+        module_name = module_name_from_path(path, root)
+        with contextlib.suppress(KeyError):
+            return sys.modules[module_name]
+
+        mod = _import_module_using_spec(
+            module_name, path, path.parent, insert_modules=True
+        )
+        if mod is None:
+            raise ImportError(f"Can't find module {module_name} at location {path}")
+        return mod
+
+    try:
+        pkg_root, module_name = resolve_pkg_root_and_module_name(
+            path, consider_namespace_packages=consider_namespace_packages
+        )
+    except CouldNotResolvePathError:
+        pkg_root, module_name = path.parent, path.stem
+
+    # Change sys.path permanently: restoring it at the end of this function would cause surprising
+    # problems because of delayed imports: for example, a conftest.py file imported by this function
+    # might have local imports, which would fail at runtime if we restored sys.path.
+    if mode is ImportMode.append:
+        if str(pkg_root) not in sys.path:
+            sys.path.append(str(pkg_root))
+    elif mode is ImportMode.prepend:
+        if str(pkg_root) != sys.path[0]:
+            sys.path.insert(0, str(pkg_root))
+    else:
+        assert_never(mode)
+
+    importlib.import_module(module_name)
+
+    mod = sys.modules[module_name]
+    if path.name == "__init__.py":
+        return mod
+
+    ignore = os.environ.get("PY_IGNORE_IMPORTMISMATCH", "")
+    if ignore != "1":
+        module_file = mod.__file__
+        if module_file is None:
+            raise ImportPathMismatchError(module_name, module_file, path)
+
+        if module_file.endswith((".pyc", ".pyo")):
+            module_file = module_file[:-1]
+        if module_file.endswith(os.sep + "__init__.py"):
+            module_file = module_file[: -(len(os.sep + "__init__.py"))]
+
+        try:
+            is_same = _is_same(str(path), module_file)
+        except FileNotFoundError:
+            is_same = False
+
+        if not is_same:
+            raise ImportPathMismatchError(module_name, module_file, path)
+
+    return mod
+
+
+def _import_module_using_spec(
+    module_name: str, module_path: Path, module_location: Path, *, insert_modules: bool
+) -> Optional[ModuleType]:
+    """
+    Tries to import a module by its canonical name, path to the .py file, and its
+    parent location.
+
+    :param insert_modules:
+        If True, will call insert_missing_modules to create empty intermediate modules
+        for made-up module names (when importing test files not reachable from sys.path).
+    """
+    # Checking with sys.meta_path first in case one of its hooks can import this module,
+    # such as our own assertion-rewrite hook.
+    for meta_importer in sys.meta_path:
+        spec = meta_importer.find_spec(module_name, [str(module_location)])
+        if spec_matches_module_path(spec, module_path):
+            break
+    else:
+        spec = importlib.util.spec_from_file_location(module_name, str(module_path))
+
+    if spec_matches_module_path(spec, module_path):
+        assert spec is not None
+        # Attempt to import the parent module, seems is our responsibility:
+        # https://github.com/python/cpython/blob/73906d5c908c1e0b73c5436faeff7d93698fc074/Lib/importlib/_bootstrap.py#L1308-L1311
+        parent_module_name, _, name = module_name.rpartition(".")
+        parent_module: Optional[ModuleType] = None
+        if parent_module_name:
+            parent_module = sys.modules.get(parent_module_name)
+            if parent_module is None:
+                # Find the directory of this module's parent.
+                parent_dir = (
+                    module_path.parent.parent
+                    if module_path.name == "__init__.py"
+                    else module_path.parent
+                )
+                # Consider the parent module path as its __init__.py file, if it has one.
+                parent_module_path = (
+                    parent_dir / "__init__.py"
+                    if (parent_dir / "__init__.py").is_file()
+                    else parent_dir
+                )
+                parent_module = _import_module_using_spec(
+                    parent_module_name,
+                    parent_module_path,
+                    parent_dir,
+                    insert_modules=insert_modules,
+                )
+
+        # Find spec and import this module.
+        mod = importlib.util.module_from_spec(spec)
+        sys.modules[module_name] = mod
+        spec.loader.exec_module(mod)  # type: ignore[union-attr]
+
+        # Set this module as an attribute of the parent module (#12194).
+        if parent_module is not None:
+            setattr(parent_module, name, mod)
+
+        if insert_modules:
+            insert_missing_modules(sys.modules, module_name)
+        return mod
+
+    return None
+
+
+def spec_matches_module_path(
+    module_spec: Optional[ModuleSpec], module_path: Path
+) -> bool:
+    """Return true if the given ModuleSpec can be used to import the given module path."""
+    if module_spec is None or module_spec.origin is None:
+        return False
+
+    return Path(module_spec.origin) == module_path
+
+
+# Implement a special _is_same function on Windows which returns True if the two filenames
+# compare equal, to circumvent os.path.samefile returning False for mounts in UNC (#7678).
+if sys.platform.startswith("win"):
+
+    def _is_same(f1: str, f2: str) -> bool:
+        return Path(f1) == Path(f2) or os.path.samefile(f1, f2)
+
+else:
+
+    def _is_same(f1: str, f2: str) -> bool:
+        return os.path.samefile(f1, f2)
+
+
+def module_name_from_path(path: Path, root: Path) -> str:
+    """
+    Return a dotted module name based on the given path, anchored on root.
+
+    For example: path="projects/src/tests/test_foo.py" and root="/projects", the
+    resulting module name will be "src.tests.test_foo".
+    """
+    path = path.with_suffix("")
+    try:
+        relative_path = path.relative_to(root)
+    except ValueError:
+        # If we can't get a relative path to root, use the full path, except
+        # for the first part ("d:\\" or "/" depending on the platform, for example).
+        path_parts = path.parts[1:]
+    else:
+        # Use the parts for the relative path to the root path.
+        path_parts = relative_path.parts
+
+    # Module name for packages do not contain the __init__ file, unless
+    # the `__init__.py` file is at the root.
+    if len(path_parts) >= 2 and path_parts[-1] == "__init__":
+        path_parts = path_parts[:-1]
+
+    # Module names cannot contain ".", normalize them to "_". This prevents
+    # a directory having a "." in the name (".env.310" for example) causing extra intermediate modules.
+    # Also, important to replace "." at the start of paths, as those are considered relative imports.
+    path_parts = tuple(x.replace(".", "_") for x in path_parts)
+
+    return ".".join(path_parts)
+
+
+def insert_missing_modules(modules: Dict[str, ModuleType], module_name: str) -> None:
+    """
+    Used by ``import_path`` to create intermediate modules when using mode=importlib.
+
+    When we want to import a module as "src.tests.test_foo" for example, we need
+    to create empty modules "src" and "src.tests" after inserting "src.tests.test_foo",
+    otherwise "src.tests.test_foo" is not importable by ``__import__``.
+    """
+    module_parts = module_name.split(".")
+    while module_name:
+        parent_module_name, _, child_name = module_name.rpartition(".")
+        if parent_module_name:
+            parent_module = modules.get(parent_module_name)
+            if parent_module is None:
+                try:
+                    # If sys.meta_path is empty, calling import_module will issue
+                    # a warning and raise ModuleNotFoundError. To avoid the
+                    # warning, we check sys.meta_path explicitly and raise the error
+                    # ourselves to fall back to creating a dummy module.
+                    if not sys.meta_path:
+                        raise ModuleNotFoundError
+                    parent_module = importlib.import_module(parent_module_name)
+                except ModuleNotFoundError:
+                    parent_module = ModuleType(
+                        module_name,
+                        doc="Empty module created by pytest's importmode=importlib.",
+                    )
+                modules[parent_module_name] = parent_module
+
+            # Add child attribute to the parent that can reference the child
+            # modules.
+            if not hasattr(parent_module, child_name):
+                setattr(parent_module, child_name, modules[module_name])
+
+        module_parts.pop(-1)
+        module_name = ".".join(module_parts)
+
+
+def resolve_package_path(path: Path) -> Optional[Path]:
+    """Return the Python package path by looking for the last
+    directory upwards which still contains an __init__.py.
+
+    Returns None if it cannot be determined.
+    """
+    result = None
+    for parent in itertools.chain((path,), path.parents):
+        if parent.is_dir():
+            if not (parent / "__init__.py").is_file():
+                break
+            if not parent.name.isidentifier():
+                break
+            result = parent
+    return result
+
+
+def resolve_pkg_root_and_module_name(
+    path: Path, *, consider_namespace_packages: bool = False
+) -> Tuple[Path, str]:
+    """
+    Return the path to the directory of the root package that contains the
+    given Python file, and its module name:
+
+        src/
+            app/
+                __init__.py
+                core/
+                    __init__.py
+                    models.py
+
+    Passing the full path to `models.py` will yield Path("src") and "app.core.models".
+
+    If consider_namespace_packages is True, then we additionally check upwards in the hierarchy
+    for namespace packages:
+
+    https://packaging.python.org/en/latest/guides/packaging-namespace-packages
+
+    Raises CouldNotResolvePathError if the given path does not belong to a package (missing any __init__.py files).
+    """
+    pkg_root: Optional[Path] = None
+    pkg_path = resolve_package_path(path)
+    if pkg_path is not None:
+        pkg_root = pkg_path.parent
+    if consider_namespace_packages:
+        start = pkg_root if pkg_root is not None else path.parent
+        for candidate in (start, *start.parents):
+            module_name = compute_module_name(candidate, path)
+            if module_name and is_importable(module_name, path):
+                # Point the pkg_root to the root of the namespace package.
+                pkg_root = candidate
+                break
+
+    if pkg_root is not None:
+        module_name = compute_module_name(pkg_root, path)
+        if module_name:
+            return pkg_root, module_name
+
+    raise CouldNotResolvePathError(f"Could not resolve for {path}")
+
+
+def is_importable(module_name: str, module_path: Path) -> bool:
+    """
+    Return if the given module path could be imported normally by Python, akin to the user
+    entering the REPL and importing the corresponding module name directly, and corresponds
+    to the module_path specified.
+
+    :param module_name:
+        Full module name that we want to check if is importable.
+        For example, "app.models".
+
+    :param module_path:
+        Full path to the python module/package we want to check if is importable.
+        For example, "/projects/src/app/models.py".
+    """
+    try:
+        # Note this is different from what we do in ``_import_module_using_spec``, where we explicitly search through
+        # sys.meta_path to be able to pass the path of the module that we want to import (``meta_importer.find_spec``).
+        # Using importlib.util.find_spec() is different, it gives the same results as trying to import
+        # the module normally in the REPL.
+        spec = importlib.util.find_spec(module_name)
+    except (ImportError, ValueError, ImportWarning):
+        return False
+    else:
+        return spec_matches_module_path(spec, module_path)
+
+
+def compute_module_name(root: Path, module_path: Path) -> Optional[str]:
+    """Compute a module name based on a path and a root anchor."""
+    try:
+        path_without_suffix = module_path.with_suffix("")
+    except ValueError:
+        # Empty paths (such as Path.cwd()) might break meta_path hooks (like our own assertion rewriter).
+        return None
+
+    try:
+        relative = path_without_suffix.relative_to(root)
+    except ValueError:  # pragma: no cover
+        return None
+    names = list(relative.parts)
+    if not names:
+        return None
+    if names[-1] == "__init__":
+        names.pop()
+    return ".".join(names)
+
+
+class CouldNotResolvePathError(Exception):
+    """Custom exception raised by resolve_pkg_root_and_module_name."""
+
+
+def scandir(
+    path: Union[str, "os.PathLike[str]"],
+    sort_key: Callable[["os.DirEntry[str]"], object] = lambda entry: entry.name,
+) -> List["os.DirEntry[str]"]:
+    """Scan a directory recursively, in breadth-first order.
+
+    The returned entries are sorted according to the given key.
+    The default is to sort by name.
+    """
+    entries = []
+    with os.scandir(path) as s:
+        # Skip entries with symlink loops and other brokenness, so the caller
+        # doesn't have to deal with it.
+        for entry in s:
+            try:
+                entry.is_file()
+            except OSError as err:
+                if _ignore_error(err):
+                    continue
+                raise
+            entries.append(entry)
+    entries.sort(key=sort_key)  # type: ignore[arg-type]
+    return entries
+
+
+def visit(
+    path: Union[str, "os.PathLike[str]"], recurse: Callable[["os.DirEntry[str]"], bool]
+) -> Iterator["os.DirEntry[str]"]:
+    """Walk a directory recursively, in breadth-first order.
+
+    The `recurse` predicate determines whether a directory is recursed.
+
+    Entries at each directory level are sorted.
+    """
+    entries = scandir(path)
+    yield from entries
+    for entry in entries:
+        if entry.is_dir() and recurse(entry):
+            yield from visit(entry.path, recurse)
+
+
+def absolutepath(path: "Union[str, os.PathLike[str]]") -> Path:
+    """Convert a path to an absolute path using os.path.abspath.
+
+    Prefer this over Path.resolve() (see #6523).
+    Prefer this over Path.absolute() (not public, doesn't normalize).
+    """
+    return Path(os.path.abspath(path))
+
+
+def commonpath(path1: Path, path2: Path) -> Optional[Path]:
+    """Return the common part shared with the other path, or None if there is
+    no common part.
+
+    If one path is relative and one is absolute, returns None.
+    """
+    try:
+        return Path(os.path.commonpath((str(path1), str(path2))))
+    except ValueError:
+        return None
+
+
+def bestrelpath(directory: Path, dest: Path) -> str:
+    """Return a string which is a relative path from directory to dest such
+    that directory/bestrelpath == dest.
+
+    The paths must be either both absolute or both relative.
+
+    If no such path can be determined, returns dest.
+    """
+    assert isinstance(directory, Path)
+    assert isinstance(dest, Path)
+    if dest == directory:
+        return os.curdir
+    # Find the longest common directory.
+    base = commonpath(directory, dest)
+    # Can be the case on Windows for two absolute paths on different drives.
+    # Can be the case for two relative paths without common prefix.
+    # Can be the case for a relative path and an absolute path.
+    if not base:
+        return str(dest)
+    reldirectory = directory.relative_to(base)
+    reldest = dest.relative_to(base)
+    return os.path.join(
+        # Back from directory to base.
+        *([os.pardir] * len(reldirectory.parts)),
+        # Forward from base to dest.
+        *reldest.parts,
+    )
+
+
+def safe_exists(p: Path) -> bool:
+    """Like Path.exists(), but account for input arguments that might be too long (#11394)."""
+    try:
+        return p.exists()
+    except (ValueError, OSError):
+        # ValueError: stat: path too long for Windows
+        # OSError: [WinError 123] The filename, directory name, or volume label syntax is incorrect
+        return False