wildminder-ComfyUI-KEEP/conftest.py

"""Root ``conftest.py`` - the ComfyUI-KEEP test harness (P1.2).

This file is the harness the whole modernization plan runs on.  It does three
things, in this order:

1. **Package alias.**  The repository directory name (``ComfyUI-KEEP``) is not a
   valid Python identifier, so the package is registered under the alias the
   plan mandates (``ComfyUI_KEEP``) with ``__path__`` **and**
   ``submodule_search_locations`` set - the same trick the reference pack
   ComfyUI-DyPE uses.  The alias is registered *without executing* the root
   ``__init__.py``; that is allowed only for ``modules/*`` consumers, because
   the root module imports ComfyUI.  :func:`execute_package_init` runs the real
   entry point (node tests, P3.4/P4.4) once the mocks below are installed.

2. **ComfyUI mocks.**  ``comfy_api.latest`` (``io``/``ui`` as *sibling*
   exports, ``ComfyExtension``, ``ComfyAPI``/``ComfyAPISync``),
   ``comfy.model_management``, ``comfy.model_patcher``, ``comfy.utils`` and
   ``folder_paths`` are installed into ``sys.modules`` before any test module
   is imported.  The mocks mirror the *verified* surface of ComfyUI v0.42.0
   (``docs/audit/2026-10-23-comfy-api-surface.md``); in particular ``ui`` is
   **not** an attribute of ``io``, and ``execution`` is an instance attribute
   (class-level access raises ``AttributeError``), exactly like the real API.

   The mocks can be switched **off** with ``KEEP_NO_COMFY_MOCKS=1``: the root
   conftest is imported before any test module, so the mocks would otherwise
   always win and the headless tier (plan section 4: *real* ``comfy`` /
   ``comfy_api`` modules on ``sys.path``) could never import the real ones
   in-process.  With the variable set, ``sys.modules`` is left alone and the
   real modules stay in charge.

3. **Fixtures.**  ``sample_image`` (deterministic seeded 64x64 RGB tensor) and
   the autouse ``mock_folder_paths`` reset, which gives every test its own
   ``models_dir`` and its own folder registry.

P1.2 **replaces** the P0 bootstrap: the alias set is exactly the plan's, the
ComfyUI mocks are added, and the pytest collection artifact
(``sys.modules["__init__"]``) is dropped - it was only needed before P1.1's
``--import-mode=importlib``.
"""

from __future__ import annotations

import copy
import importlib.machinery
import importlib.util
import logging
import os
import sys
import types
from pathlib import Path

import pytest
import torch

#: Absolute path of the repository root (this file's directory).
PROJECT_ROOT = Path(__file__).resolve().parent

# The repo root on sys.path so `from src.xxx import ...` / `import modules.xxx`
# work in the tests (mirrors the reference pack).
if str(PROJECT_ROOT) not in sys.path:
    sys.path.insert(0, str(PROJECT_ROOT))

# Regular packages, not test modules - they are imported explicitly by the
# tests (via the alias) and must not be collected by pytest.
collect_ignore = ["__init__.py", "src", "nodes"]

#: The package alias mandated by the plan (P1.2).
PACKAGE_ALIAS = "ComfyUI_KEEP"

#: Environment variable that switches the ComfyUI mocks **off** (see the
#: module docstring).  The headless tier of the plan (section 4) imports the
#: real ``comfy`` / ``comfy_api`` modules; the root conftest is imported
#: before any test module, so without this opt-out the mocks would always
#: win.
DISABLE_MOCKS_ENV = "KEEP_NO_COMFY_MOCKS"

#: The values of :data:`DISABLE_MOCKS_ENV` that count as "on".
TRUTHY_VALUES = frozenset({"1", "true", "yes", "on"})


def comfy_mocks_disabled() -> bool:
    """``True`` when the environment asks for the **real** ComfyUI modules."""
    return os.environ.get(DISABLE_MOCKS_ENV, "").strip().lower() in TRUTHY_VALUES


# ---------------------------------------------------------------------------
# 1. package alias
# ---------------------------------------------------------------------------
def _package_spec(alias: str) -> importlib.machinery.ModuleSpec:
    """Spec of the root ``__init__.py`` under ``alias``."""
    return importlib.util.spec_from_file_location(
        alias,
        str(PROJECT_ROOT / "__init__.py"),
        submodule_search_locations=[str(PROJECT_ROOT)],
    )


def _make_placeholder_logger(alias: str) -> logging.Logger:
    """The logger the root ``__init__.py`` would install.

    ``modules/*`` does ``from .. import logger``; the attribute only exists
    once the root ``__init__.py`` has run.  The register-without-execute mode
    therefore provides the same logger object (same name, level and handler),
    so ``modules/*`` consumers work - the plan's P3 logger constraint, until
    P3.4 moves the logger into ``src/keep_logger.py``.
    """
    logger = logging.getLogger(alias)
    logger.setLevel(logging.INFO)
    if not logger.hasHandlers():
        handler = logging.StreamHandler(sys.stderr)
        handler.setFormatter(logging.Formatter("[%(levelname)s] %(message)s"))
        logger.addHandler(handler)
    return logger


def register_package_alias(alias: str = PACKAGE_ALIAS) -> types.ModuleType:
    """Register the package under ``alias`` **without executing** it.

    The module object gets ``__path__`` and ``submodule_search_locations``, so
    ``import <alias>.modules.utils`` resolves inside the repository - but the
    root ``__init__.py`` itself is not run (it needs ComfyUI).
    """
    existing = sys.modules.get(alias)
    if existing is not None:
        return existing
    module = importlib.util.module_from_spec(_package_spec(alias))
    module.__path__ = [str(PROJECT_ROOT)]  # type: ignore[attr-defined]
    module.logger = _make_placeholder_logger(alias)  # type: ignore[attr-defined]
    sys.modules[alias] = module
    return module


def execute_package_init(alias: str = PACKAGE_ALIAS) -> types.ModuleType:
    """Execute the root ``__init__.py`` under ``alias`` and return the module.

    This is the path the node tests use (P1.2 mocks + the P3.4/P4.4 V3
    entrypoint): the package is really executed, so ``comfy_entrypoint`` /
    ``NODE_CLASS_MAPPINGS`` and the ``logger`` the ``modules/*`` code imports
    via ``from .. import logger`` are real.  The register-without-execute stub
    is replaced.
    """
    _install_comfy_mocks()
    module = importlib.util.module_from_spec(_package_spec(alias))
    sys.modules[alias] = module
    module.__spec__.loader.exec_module(module)  # type: ignore[union-attr]
    return module


# ---------------------------------------------------------------------------
# 2. ComfyUI mocks
# ---------------------------------------------------------------------------
class _MockSchema:
    """Mock of ``comfy_api.latest.io.Schema`` (a dataclass in the real API)."""

    def __init__(
        self,
        node_id: str | None = None,
        display_name: str | None = None,
        category: str = "sd",
        inputs: list | None = None,
        outputs: list | None = None,
        hidden: list | None = None,
        description: str = "",
        search_aliases: list | None = None,
        is_input_list: bool = False,
        is_output_node: bool = False,
        is_deprecated: bool = False,
        is_experimental: bool = False,
        is_dev_only: bool = False,
        is_api_node: bool = False,
        **extra: object,
    ) -> None:
        self.node_id = node_id
        self.display_name = display_name
        self.category = category
        self.inputs = list(inputs) if inputs is not None else []
        self.outputs = list(outputs) if outputs is not None else []
        self.hidden = list(hidden) if hidden is not None else []
        self.description = description
        self.search_aliases = list(search_aliases) if search_aliases is not None else []
        self.is_input_list = is_input_list
        self.is_output_node = is_output_node
        self.is_deprecated = is_deprecated
        self.is_experimental = is_experimental
        self.is_dev_only = is_dev_only
        self.is_api_node = is_api_node
        # Unknown keyword arguments are kept (the real dataclass would raise);
        # being forgiving keeps the mock usable while a schema is drafted.
        for key, value in extra.items():
            setattr(self, key, value)


class _MockInput:
    """Mock of ``comfy_api.latest.io.Input``."""

    def __init__(
        self,
        id: str,
        display_name: str | None = None,
        optional: bool = False,
        tooltip: str | None = None,
        lazy: bool | None = None,
        extra_dict: dict | None = None,
        raw_link: bool | None = None,
        advanced: bool | None = None,
        **extra: object,
    ) -> None:
        self.id = id
        self.display_name = display_name
        self.optional = optional
        self.tooltip = tooltip
        self.lazy = lazy
        self.extra_dict = dict(extra_dict) if extra_dict is not None else {}
        self.rawLink = raw_link
        self.advanced = advanced
        for key, value in extra.items():
            setattr(self, key, value)

    def as_dict(self) -> dict:
        return {
            "display_name": self.display_name,
            "optional": self.optional,
            "tooltip": self.tooltip,
            "lazy": self.lazy,
            "rawLink": self.rawLink,
            "advanced": self.advanced,
            **self.extra_dict,
        }


class _MockWidgetInput(_MockInput):
    """Mock of the widget inputs (``io.Int.Input``, ``io.Combo.Input``, ...).

    The real widget inputs carry ``default``/``min``/``max``/``step``/``options``
    - the very fields the P4 schema-snapshot tests compare against the V1
    ``INPUT_TYPES``.
    """

    def __init__(
        self,
        id: str,
        default=None,
        min=None,  # noqa: A002 - the real API uses these names
        max=None,  # noqa: A002 - the real API uses these names
        step=None,
        options=None,
        control_after_generate=None,
        **kwargs,
    ) -> None:
        super().__init__(id, **kwargs)
        self.default = default
        self.min = min
        self.max = max
        self.step = step
        self.options = options
        self.control_after_generate = control_after_generate

    def as_dict(self) -> dict:
        return super().as_dict() | {
            "default": self.default,
            "min": self.min,
            "max": self.max,
            "step": self.step,
            "options": self.options,
        }


class _MockOutput:
    """Mock of ``comfy_api.latest.io.Output``."""

    def __init__(
        self,
        display_name: str | None = None,
        tooltip: str | None = None,
        **extra: object,
    ) -> None:
        self.display_name = display_name
        self.tooltip = tooltip
        for key, value in extra.items():
            setattr(self, key, value)


class _MockNodeOutput:
    """Mock of ``comfy_api.latest.io.NodeOutput``.

    ``result`` returns the positional args (or ``None`` when empty), exactly
    like the real class, so node code can return ``io.NodeOutput(value)``.
    """

    def __init__(
        self,
        *args: object,
        ui: object | None = None,
        expand: dict | None = None,
        block_execution: str | None = None,
    ) -> None:
        self.args = args
        self.ui = ui
        self.expand = expand
        self.block_execution = block_execution

    @property
    def result(self):
        return self.args if self.args else None

    def __getitem__(self, index):
        return self.args[index]

    def __iter__(self):
        return iter(self.args)


class _MockComfyNode:
    """Mock of ``comfy_api.latest.io.ComfyNode``.

    The real base class raises ``NotImplementedError`` for the abstract hooks
    and provides ``check_lazy_status``; the mock keeps that behaviour so a
    node that forgets to implement a hook fails loudly instead of silently
    passing.
    """

    @classmethod
    def define_schema(cls) -> _MockSchema:
        raise NotImplementedError

    @classmethod
    def execute(cls, **kwargs):
        raise NotImplementedError

    @classmethod
    def validate_inputs(cls, **kwargs):
        raise NotImplementedError

    @classmethod
    def fingerprint_inputs(cls, **kwargs):
        raise NotImplementedError

    @classmethod
    def check_lazy_status(cls, **kwargs) -> list[str]:
        return [name for name in kwargs if kwargs[name] is None]

    @classmethod
    def GET_SCHEMA(cls) -> _MockSchema:
        """Validate/finalize the schema once per class (real API behaviour)."""
        if "_schema_cache" not in cls.__dict__:
            cls._schema_cache = cls.define_schema()  # type: ignore[attr-defined]
        return cls._schema_cache  # type: ignore[attr-defined]


class _MockTypeIO:
    """Base of the mock socket types (``io.Image``, ``io.Int``, ...)."""

    Input = _MockInput
    Output = _MockOutput
    type_name: str = ""


class _MockIO:
    """Mock of ``comfy_api.latest.io`` (the *sibling* of ``ui``)."""

    Schema = _MockSchema
    Input = _MockInput
    Output = _MockOutput
    NodeOutput = _MockNodeOutput
    ComfyNode = _MockComfyNode

    class Boolean(_MockTypeIO):
        type_name = "BOOLEAN"
        Input = _MockWidgetInput

    class Int(_MockTypeIO):
        type_name = "INT"
        Input = _MockWidgetInput

    class Float(_MockTypeIO):
        type_name = "FLOAT"
        Input = _MockWidgetInput

    class String(_MockTypeIO):
        type_name = "STRING"
        Input = _MockWidgetInput

    class Combo(_MockTypeIO):
        type_name = "COMBO"
        Input = _MockWidgetInput

    class MultiCombo(_MockTypeIO):
        type_name = "MULTICOMBO"
        Input = _MockWidgetInput

    class Image(_MockTypeIO):
        type_name = "IMAGE"

    class Mask(_MockTypeIO):
        type_name = "MASK"

    class Latent(_MockTypeIO):
        type_name = "LATENT"

    class Conditioning(_MockTypeIO):
        type_name = "CONDITIONING"

    class Model(_MockTypeIO):
        type_name = "MODEL"

    class ModelPatch(_MockTypeIO):
        type_name = "MODEL_PATCH"

    class Vae(_MockTypeIO):
        type_name = "VAE"

    class UpscaleModel(_MockTypeIO):
        type_name = "UPSCALE_MODEL"

    class Audio(_MockTypeIO):
        type_name = "AUDIO"

    class Video(_MockTypeIO):
        type_name = "VIDEO"

    class Hidden:
        unique_id = "unique_id"
        prompt = "prompt"

    @staticmethod
    def Custom(io_type: str):
        """Mock of ``io.Custom("TYPE")`` - a socket type by name."""
        return type(
            f"Custom_{io_type}",
            (_MockTypeIO,),
            {"type_name": io_type},
        )


class _MockUI:
    """Mock of ``comfy_api.latest.ui`` (the *sibling* of ``io``)."""

    class PreviewImage:
        def __init__(self, *args, **kwargs) -> None:
            self.args = args
            self.kwargs = kwargs

    class PreviewAudio:
        def __init__(self, *args, **kwargs) -> None:
            self.args = args
            self.kwargs = kwargs

    class SaveImage:
        def __init__(self, *args, **kwargs) -> None:
            self.args = args
            self.kwargs = kwargs


class _MockComfyExtension:
    """Mock of ``comfy_api.latest.ComfyExtension``."""

    async def on_load(self) -> None:
        return None

    async def get_node_list(self) -> list:
        return []


class _SyncExecution:
    """``ComfyAPISync().execution`` - a *synchronous* progress recorder."""

    def __init__(self) -> None:
        self.calls: list[tuple[float, float]] = []

    def set_progress(
        self,
        value: float,
        max_value: float,
        node_id: str | None = None,
        preview_image: object | None = None,
        ignore_size_limit: bool = False,
    ) -> None:
        self.calls.append((value, max_value))


class _AsyncExecution:
    """``ComfyAPI().execution`` - an *asynchronous* progress recorder."""

    def __init__(self) -> None:
        self.calls: list[tuple[float, float]] = []

    async def set_progress(
        self,
        value: float,
        max_value: float,
        node_id: str | None = None,
        preview_image: object | None = None,
        ignore_size_limit: bool = False,
    ) -> None:
        self.calls.append((value, max_value))


class _MockComfyAPI:
    """Mock of ``comfy_api.latest.ComfyAPI`` (async execution API)."""

    def __init__(self) -> None:
        # Instance attribute on purpose: the real API raises AttributeError on
        # class-level access (`ComfyAPI.execution`), see the P4.2 audit.
        self.execution = _AsyncExecution()


class _MockComfyAPISync:
    """Mock of ``comfy_api.latest.ComfyAPISync`` (synchronous execution API)."""

    def __init__(self) -> None:
        self.execution = _SyncExecution()


class _MockModelPatcher:
    """Mock of ``comfy.model_patcher.ModelPatcher``."""

    def __init__(self, model=None, *args, **kwargs) -> None:
        self.model = model if model is not None else types.SimpleNamespace()
        if not hasattr(self.model, "diffusion_model"):
            self.model.diffusion_model = types.SimpleNamespace()
        self._object_patches: dict = {}
        self._unet_wrapper = None

    def clone(self) -> "_MockModelPatcher":
        new = _MockModelPatcher()
        new.model = copy.copy(self.model)
        new.model.diffusion_model = copy.copy(self.model.diffusion_model)
        new._object_patches = dict(self._object_patches)
        new._unet_wrapper = self._unet_wrapper
        return new

    def add_object_patch(self, path: str, obj) -> None:
        self._object_patches[path] = obj

    def set_model_unet_function_wrapper(self, fn) -> None:
        self._unet_wrapper = fn


class _MockModelManagement(types.ModuleType):
    """Mock of ``comfy.model_management`` - records the residency calls."""

    def __init__(self) -> None:
        super().__init__("comfy.model_management")
        self.calls: list[tuple] = []

    def load_models_gpu(self, models, memory_required=None, **kwargs) -> None:
        self.calls.append(("load_models_gpu", models, memory_required))

    def load_model_gpu(self, model):
        self.calls.append(("load_model_gpu", model))
        return model

    def unload_all_models(self) -> None:
        self.calls.append(("unload_all_models",))

    def soft_empty_cache(self) -> None:
        self.calls.append(("soft_empty_cache",))

    def get_torch_device(self):
        self.calls.append(("get_torch_device",))
        return torch.device("cpu")

    def unet_offload_device(self):
        self.calls.append(("unet_offload_device",))
        return torch.device("cpu")

    def cast_to_device(self, tensor, device=None, dtype=None):
        return tensor

    def unet_dtype(self, *args, **kwargs):
        return torch.float32

    def should_use_fp16(self, *args, **kwargs) -> bool:
        return False

    def get_free_memory(self, *args, **kwargs):
        return 0, 0


class _MockProgressBar:
    """Mock of ``comfy.utils.ProgressBar``."""

    def __init__(self, total: int = 0) -> None:
        self.total = total
        self.current = 0

    def update_absolute(self, value, total=None, preview=None) -> None:
        self.current = value
        if total is not None:
            self.total = total

    def update(self, value) -> None:
        self.current += value

    def close(self) -> None:
        return None


def _mock_tiled_scale(samples, function, tile_x=512, tile_y=512, overlap=64, upscale_amount=1, **kwargs):
    """Mock of ``comfy.utils.tiled_scale`` - a passthrough (no tiling)."""
    return function(samples)


class _MockFolderPaths(types.ModuleType):
    """Mock of ComfyUI's top-level ``folder_paths`` module.

    ``models_dir`` and the folder registry live in memory, so the autouse
    ``mock_folder_paths`` fixture can hand every test its own directories.
    """

    def __init__(self) -> None:
        super().__init__("folder_paths")
        self.base_path = str(PROJECT_ROOT)
        self.models_dir = str(PROJECT_ROOT / "models")
        self.folder_names_and_paths: dict[str, list[tuple[str, bool]]] = {}
        self.folder_names_and_paths_with_mtime: dict[str, list] = {}
        self.custom_folder_paths: dict[str, list[tuple[str, bool]]] = {}
        self.calls: list[tuple] = []

    def add_model_folder_path(self, name: str, path: str, is_default: bool = False) -> None:
        self.calls.append(("add_model_folder_path", name, path, is_default))
        self.folder_names_and_paths.setdefault(name, []).append((str(path), is_default))

    def get_folder_paths(self, name: str) -> list[str]:
        self.calls.append(("get_folder_paths", name))
        return [path for path, _ in self.folder_names_and_paths.get(name, [])]

    def get_full_path_or_raise(self, name: str, filename: str) -> str:
        self.calls.append(("get_full_path_or_raise", name, filename))
        for path, _ in self.folder_names_and_paths.get(name, []):
            candidate = os.path.join(path, filename)
            if os.path.isfile(candidate):
                return candidate
        raise FileNotFoundError(
            f"filename not found in {name}: {filename!r} "
            f"(searched: {self.folder_names_and_paths.get(name, [])})"
        )

    def get_filename_list(self, name: str) -> list[str]:
        self.calls.append(("get_filename_list", name))
        found: list[str] = []
        for path, _ in self.folder_names_and_paths.get(name, []):
            if not os.path.isdir(path):
                continue
            for entry in sorted(os.listdir(path)):
                if os.path.isfile(os.path.join(path, entry)):
                    found.append(entry)
        return found

    def exists_annotated_filepath(self, name: str, filename: str) -> tuple[str, str | None]:
        return self.get_full_path_or_raise(name, filename), None


def _install_comfy_mocks() -> None:
    """Install the ComfyUI mocks into ``sys.modules``.

    Nothing is overwritten: if a real ComfyUI is already imported (the
    ``headless`` tier runs the helper in its own interpreter), the real
    modules stay in charge.

    The mocks are skipped entirely when ``KEEP_NO_COMFY_MOCKS`` is set - the
    opt-out the headless tier needs (the root conftest is imported before any
    test module, so the "already imported" check above can never be true in
    an ordinary pytest session).
    """
    if comfy_mocks_disabled():
        return
    if "comfy_api.latest" in sys.modules or "comfy" in sys.modules:
        return

    # --- comfy_api.latest -------------------------------------------------
    mock_comfy_api = types.ModuleType("comfy_api")
    mock_comfy_api.__path__ = []  # type: ignore[attr-defined]
    mock_comfy_api_latest = types.ModuleType("comfy_api.latest")

    mock_io = _MockIO()
    mock_ui = _MockUI()

    mock_comfy_api_latest.io = mock_io
    mock_comfy_api_latest.ui = mock_ui
    mock_comfy_api_latest.IO = mock_io
    mock_comfy_api_latest.UI = mock_ui
    mock_comfy_api_latest.ComfyExtension = _MockComfyExtension
    mock_comfy_api_latest.ComfyAPI = _MockComfyAPI
    mock_comfy_api_latest.ComfyAPISync = _MockComfyAPISync

    # --- comfy.model_management / comfy.model_patcher / comfy.utils ------
    mock_model_management = _MockModelManagement()

    mock_model_patcher = types.ModuleType("comfy.model_patcher")
    mock_model_patcher.ModelPatcher = _MockModelPatcher  # type: ignore[attr-defined]

    mock_comfy_utils = types.ModuleType("comfy.utils")
    mock_comfy_utils.ProgressBar = _MockProgressBar  # type: ignore[attr-defined]
    mock_comfy_utils.tiled_scale = _mock_tiled_scale  # type: ignore[attr-defined]

    # --- comfy (top level) ------------------------------------------------
    mock_comfy = types.ModuleType("comfy")
    mock_comfy.__path__ = []  # type: ignore[attr-defined]
    mock_comfy.model_management = mock_model_management  # type: ignore[attr-defined]
    mock_comfy.model_patcher = mock_model_patcher  # type: ignore[attr-defined]
    mock_comfy.utils = mock_comfy_utils  # type: ignore[attr-defined]

    # --- folder_paths (top level, not a comfy submodule) ------------------
    mock_folder_paths = _MockFolderPaths()

    sys.modules["comfy"] = mock_comfy
    sys.modules["comfy.model_management"] = mock_model_management
    sys.modules["comfy.model_patcher"] = mock_model_patcher
    sys.modules["comfy.utils"] = mock_comfy_utils
    sys.modules["comfy_api"] = mock_comfy_api
    sys.modules["comfy_api.latest"] = mock_comfy_api_latest
    sys.modules["folder_paths"] = mock_folder_paths


# Install the mocks immediately (before pytest imports any test module).
_install_comfy_mocks()

# The plan's package alias (P1.2) - registered, not executed.
register_package_alias()

#: The name pytest imports the repository root under.
#:
#: The repository root is itself a Python package (it has an ``__init__.py``),
#: so pytest's ``Package.setup()`` imports that file during collection - under
#: the name ``__init__`` - **independently of the import mode**.  The root
#: module uses *relative* imports (``from .modules import utils``), so it can
#: only be imported as part of a package; registering the alias module under
#: this name as well keeps pytest from executing the entry point a second
#: time (which would fail with "attempted relative import with no known
#: parent package").
#:
#: This is the P0 "collection artifact" that P1.2 planned to drop - it cannot
#: be dropped while the repository root is a package (see
#: ``docs/audit/2026-10-23-p1-test-infrastructure.md``).
COLLECTION_MODULE_NAME = "__init__"
sys.modules.setdefault(COLLECTION_MODULE_NAME, sys.modules[PACKAGE_ALIAS])


# ---------------------------------------------------------------------------
# 3. fixtures
# ---------------------------------------------------------------------------
def _make_sample_image() -> torch.Tensor:
    """Deterministic seeded 64x64 RGB IMAGE tensor ``(1, 64, 64, 3)``."""
    generator = torch.Generator().manual_seed(1234)
    return torch.rand((1, 64, 64, 3), generator=generator, dtype=torch.float32)


@pytest.fixture
def sample_image() -> torch.Tensor:
    """A deterministic ``(1, 64, 64, 3)`` float32 RGB tensor in ``[0, 1]``."""
    return _make_sample_image()


@pytest.fixture(autouse=True)
def mock_folder_paths(tmp_path):
    """Autouse: every test gets its own ``models_dir`` and folder registry.

    The reset happens *before* the test (so a test never sees the directory of
    another test) and is undone afterwards.

    The fixture is defensive on purpose: a test that installs its own
    ``folder_paths`` stand-in (the P0 dependency-decision probe does) keeps
    working - only the attributes that exist are isolated.
    """
    folder_paths = sys.modules.get("folder_paths")
    if folder_paths is None:
        yield None
        return

    original_models_dir = getattr(folder_paths, "models_dir", None)
    registry = getattr(folder_paths, "folder_names_and_paths", None)
    original_registry = (
        {key: list(value) for key, value in registry.items()} if registry is not None else None
    )
    with_mtime = getattr(folder_paths, "folder_names_and_paths_with_mtime", None)

    models_dir = tmp_path / "models"
    models_dir.mkdir(parents=True, exist_ok=True)
    folder_paths.models_dir = str(models_dir)
    if registry is not None:
        registry.clear()
    if with_mtime is not None:
        with_mtime.clear()

    yield folder_paths

    if original_models_dir is not None:
        folder_paths.models_dir = original_models_dir
    if registry is not None and original_registry is not None:
        registry.clear()
        registry.update(original_registry)
    if with_mtime is not None:
        with_mtime.clear()