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Signed-off-by: Daniel Xu <dxu@dxuuu.xyz>

tests/test_utils/test_proxy.py

@@ -0,0 +1,34 @@
+import operator
+from typing import Any
+from typing_extensions import override
+
+from tinker._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 type(proxy).__name__ == "RecursiveLazyProxy"
+    assert type(operator.attrgetter("name.foo.bar.baz")(proxy)).__name__ == "RecursiveLazyProxy"
+
+
+def test_isinstance_does_not_error() -> None:
+    class AlwaysErrorProxy(LazyProxy[Any]):
+        @override
+        def __load__(self) -> Any:
+            raise RuntimeError("Mocking missing dependency")
+
+    proxy = AlwaysErrorProxy()
+    assert not isinstance(proxy, dict)
+    assert isinstance(proxy, LazyProxy)