wip: only support pytest functions

src/syrupy/__init__.py

@@ -109,7 +109,9 @@ def pytest_sessionstart(session: Any) -> None:
     config._syrupy.start()
 
 
-def pytest_collection_modifyitems(session: Any, config: Any, items: List[Any]) -> None:
+def pytest_collection_modifyitems(
+    session: Any, config: Any, items: List["pytest.Item"]
+) -> None:
     """
     After tests are collected and before any modification is performed.
     https://docs.pytest.org/en/latest/reference.html#_pytest.hookspec.pytest_collection_modifyitems

src/syrupy/session.py

@@ -1,7 +1,6 @@
 from pathlib import Path
 from typing import (
     TYPE_CHECKING,
-    Any,
     Dict,
     Iterable,
     List,
@@ -10,6 +9,7 @@
 )
 
 import attr
+import pytest
 
 from .constants import EXIT_STATUS_FAIL_UNUSED
 from .data import SnapshotFossils
@@ -29,8 +29,8 @@ class SnapshotSession:
     is_providing_paths: bool = attr.ib()
     is_providing_nodes: bool = attr.ib()
     report: Optional["SnapshotReport"] = attr.ib(default=None)
-    _all_items: Set[Any] = attr.ib(factory=set)
-    _ran_items: Set[Any] = attr.ib(factory=set)
+    _all_items: Set["pytest.Item"] = attr.ib(factory=set)
+    _ran_items: Set["pytest.Item"] = attr.ib(factory=set)
     _assertions: List["SnapshotAssertion"] = attr.ib(factory=list)
     _extensions: Dict[str, "AbstractSyrupyExtension"] = attr.ib(factory=dict)
 
@@ -92,5 +92,5 @@ def remove_unused_snapshots(
                 Path(snapshot_location).unlink()
 
     @staticmethod
-    def filter_valid_items(items: List[Any]) -> Iterable[Any]:
-        return (item for item in items if hasattr(item, "obj"))
+    def filter_valid_items(items: List["pytest.Item"]) -> Iterable["pytest.Item"]:
+        return (item for item in items if isinstance(item, pytest.Function))

stubs/pytest.pyi

@@ -3,3 +3,6 @@ from typing import Any, Callable, TypeVar
 ReturnType = TypeVar("ReturnType")
 
 def fixture(func: Callable[..., ReturnType]) -> Callable[..., ReturnType]: ...
+
+class Function: ...
+class Item: ...