Add test capturing failure when resolving the MultiplexedPath for a namespace package with non-path elements in the path.

Ref #311

Author: jaraco

importlib_resources/tests/test_files.py

@@ -8,6 +8,8 @@
 import importlib
 import contextlib
 
+import pytest
+
 import importlib_resources as resources
 from ..abc import Traversable
 from . import util
@@ -60,6 +62,27 @@ class OpenZipTests(FilesTests, util.ZipSetup, unittest.TestCase):
 class OpenNamespaceTests(FilesTests, util.DiskSetup, unittest.TestCase):
  MODULE = 'namespacedata01'
 
+ @pytest.mark.xfail(reason="#311")
+ def test_non_paths_in_dunder_path(self):
+ """
+ Non-path items in a namespace package's ``__path__`` are ignored.
+
+ As reported in python/importlib_resources#311, some tools
+ like Setuptools, when creating editable packages, will inject
+ non-paths into a namespace package's ``__path__``, a
+ sentinel like
+ ``__editable__.sample_namespace-1.0.finder.__path_hook__``
+ to cause the ``PathEntryFinder`` to be called when searching
+ for packages. In that case, resources should still be loadable.
+ """
+ import namespacedata01
+
+ namespacedata01.__path__.append(
+ '__editable__.sample_namespace-1.0.finder.__path_hook__'
+ )
+
+ resources.files(namespacedata01)
+
 
 class OpenNamespaceZipTests(FilesTests, util.ZipSetup, unittest.TestCase):
  ZIP_MODULE = 'namespacedata01'