chore(internal): add tests for proxy change (#260)

tests/test_utils/test_proxy.py

@@ -0,0 +1,23 @@
+import operator
+from typing import Any
+from typing_extensions import override
+
+from anthropic._utils import LazyProxy
+
+
+class RecursiveLazyProxy(LazyProxy[Any]):
+    @override
+    def __load__(self) -> Any:
+        return self
+
+    def __call__(self, *_args: Any, **_kwds: Any) -> Any:
+        raise RuntimeError("This should never be called!")
+
+
+def test_recursive_proxy() -> None:
+    proxy = RecursiveLazyProxy()
+    assert repr(proxy) == "RecursiveLazyProxy"
+    assert str(proxy) == "RecursiveLazyProxy"
+    assert dir(proxy) == []
+    assert getattr(type(proxy), "__name__") == "RecursiveLazyProxy"
+    assert type(operator.attrgetter("name.foo.bar.baz")(proxy)).__name__ == "RecursiveLazyProxy"