Add test capturing expectation that a Path is a Traversable.

pyproject.toml

@@ -41,6 +41,7 @@ test = [
 	"big-O",
 	"pytest-ignore-flaky",
 	"jaraco.test",
+	"importlib_resources; python_version < '3.9'",
 ]
 doc = [
 	# upstream

tests/compat/py39.py

@@ -9,3 +9,17 @@
 )
 
 sys.modules[__name__ + '.os_helper'] = os_helper
+
+
+try:
+    from importlib.resources.abc import Traversable
+except ImportError:
+    try:
+        # Python 3.9
+        from importlib.abc import Traversable
+    except ImportError:
+        # Python 3.8
+        from importlib_resources.abc import Traversable
+
+
+__all__ = ['Traversable']

tests/test_path.py

@@ -588,3 +588,10 @@ def test_malformed_paths(self):
             'two-slash.txt',
             'parent.txt',
         ]
+
+    @pass_alpharep
+    def test_interface(self, alpharep):
+        from .compat.py39 import Traversable
+
+        zf = zipfile.Path(alpharep)
+        assert isinstance(zf, Traversable)