Honor the declared pathlike interface in lazy proxies

src/wrapt/proxies.py

@@ -270,6 +270,9 @@ def __new__(cls, callback=None, *args, interface=..., **kwargs):
         if "__anext__" in interface_attrs and "__anext__" not in class_attrs:
             namespace["__anext__"] = __wrapper_anext__
 
+        if "__fspath__" in interface_attrs and "__fspath__" not in class_attrs:
+            namespace["__fspath__"] = __wrapper_fspath__
+
         if (
             "__length_hint__" in interface_attrs
             and "__length_hint__" not in class_attrs

tests/core/test_lazy_object_proxy.py

@@ -1,11 +1,30 @@
+import os
 import sys
 import unittest
+from pathlib import Path
 
 import wrapt
 
 
 class TestLazyObjectProxy(unittest.TestCase):
 
+    def test_pathlike_interface_is_lazy(self):
+        for interface in (os.PathLike, Path):
+            with self.subTest(interface=interface):
+                status = {"created": 0}
+
+                def factory():
+                    status["created"] += 1
+                    return Path("example.txt")
+
+                proxy = wrapt.LazyObjectProxy(factory, interface=interface)
+                self.assertEqual(status["created"], 0)
+                self.assertTrue(hasattr(type(proxy), "__fspath__"))
+                self.assertEqual(os.fspath(proxy), "example.txt")
+                self.assertEqual(status["created"], 1)
+                self.assertEqual(os.fspath(proxy), "example.txt")
+                self.assertEqual(status["created"], 1)
+
     def test_lazy_object_proxy(self):
         status = {"created": 0}