FIx.

Author: tobiasraabe

Diff for: tests/conftest.py

@@ -11,7 +11,6 @@
 
 import pytest
 from click.testing import CliRunner
-from nbmake.pytest_items import NotebookItem
 from packaging import version
 
 from pytask import console
@@ -133,6 +132,11 @@ def run_in_subprocess(cmd: tuple[str, ...], cwd: Path | None = None) -> Result:
 
 def pytest_collection_modifyitems(session, config, items) -> None:  # noqa: ARG001
     """Add markers to Jupyter notebook tests."""
+    if sys.platform == "win32" and sys.version_info == (3, 13):
+        return
+
+    from nbmake.pytest_items import NotebookItem
+
     for item in items:
         if isinstance(item, NotebookItem):
             item.add_marker(pytest.mark.xfail(reason="The tests are flaky."))

Diff for: tox.ini

@@ -21,7 +21,7 @@ commands =
 [testenv:test]
 extras = test
 deps =
-    nbmake;not (platform_system == "Windows" and python_version == "3.13")
+    nbmake;platform_system != "Windows" and python_version != "3.13"
     pygraphviz;platform_system == "Linux"
 commands =
     pytest --nbmake {posargs}