diff --git a/tests/test_typed_state.py b/tests/test_typed_state.py
new file mode 100644
index 000000000..3293d08b4
--- /dev/null
+++ b/tests/test_typed_state.py
@@ -0,0 +1,167 @@
+from contextlib import asynccontextmanager
+from typing import TypedDict
+
+import pytest
+from fastapi import Depends, FastAPI, TypedState
+from fastapi.testclient import TestClient
+
+
+class MyState(TypedDict):
+    param_1: str
+    param_2: int
+
+
+@asynccontextmanager
+async def lifespan(app: FastAPI):
+    state = MyState(param_1="example", param_2=42)
+    yield state
+
+
+app = FastAPI(lifespan=lifespan)
+
+
+@app.get("/read")
+async def read_state(state: TypedState[MyState]):
+    return {"param_1": state._state["param_1"], "param_2": state._state["param_2"]}
+
+
+async def update_state(state: TypedState[MyState]):
+    state._state["param_1"] = "Updated"
+
+
+@app.get("/updated-state", dependencies=[Depends(update_state)])
+async def read_updated_state(state: TypedState[MyState]):
+    return {"param_1": state._state["param_1"], "param_2": state._state["param_2"]}
+
+
+@app.get("/read-attribute-access")
+async def read_attribute(state: TypedState[MyState]):
+    # This way it's not typed, but attribute access works
+    return {
+        "param_1": state.param_1,
+        "param_2": state.param_2,
+    }
+
+
+async def update_state_attribute_access(state: TypedState[MyState]):
+    state.param_1 = "Updated"  # This way it's not typed, but attribute access works
+
+
+@app.get(
+    "/updated-state-attribute-access",
+    dependencies=[Depends(update_state_attribute_access)],
+)
+async def read_updated_attribute(state: TypedState[MyState]):
+    # This way it's not typed, but attribute access works
+    return {
+        "param_1": state.param_1,
+        "param_2": state.param_2,
+    }
+
+
+@pytest.mark.parametrize(
+    "path",
+    [
+        "/read",
+        "/read-attribute-access",
+    ],
+)
+def test_read(path: str):
+    with TestClient(app) as client:
+        response = client.get(path)
+    assert response.status_code == 200
+    assert response.json() == {"param_1": "example", "param_2": 42}
+
+
+@pytest.mark.parametrize(
+    "path",
+    [
+        "/updated-state",
+        "/updated-state-attribute-access",
+    ],
+)
+def test_read_updated_state_state(path: str):
+    with TestClient(app) as client:
+        response = client.get("/updated-state")
+    assert response.status_code == 200
+    assert response.json() == {"param_1": "Updated", "param_2": 42}
+
+
+def test_openapi_schema():
+    with TestClient(app) as client:
+        response = client.get("/openapi.json")
+    assert response.status_code == 200
+    schema = response.json()
+    assert schema == {
+        "info": {
+            "title": "FastAPI",
+            "version": "0.1.0",
+        },
+        "openapi": "3.1.0",
+        "paths": {
+            "/read": {
+                "get": {
+                    "operationId": "read_state_read_get",
+                    "responses": {
+                        "200": {
+                            "content": {
+                                "application/json": {
+                                    "schema": {},
+                                },
+                            },
+                            "description": "Successful Response",
+                        },
+                    },
+                    "summary": "Read State",
+                },
+            },
+            "/read-attribute-access": {
+                "get": {
+                    "operationId": "read_attribute_read_attribute_access_get",
+                    "responses": {
+                        "200": {
+                            "content": {
+                                "application/json": {
+                                    "schema": {},
+                                },
+                            },
+                            "description": "Successful Response",
+                        },
+                    },
+                    "summary": "Read Attribute",
+                },
+            },
+            "/updated-state": {
+                "get": {
+                    "operationId": "read_updated_state_updated_state_get",
+                    "responses": {
+                        "200": {
+                            "content": {
+                                "application/json": {
+                                    "schema": {},
+                                },
+                            },
+                            "description": "Successful Response",
+                        },
+                    },
+                    "summary": "Read Updated State",
+                },
+            },
+            "/updated-state-attribute-access": {
+                "get": {
+                    "operationId": "read_updated_attribute_updated_state_attribute_access_get",
+                    "responses": {
+                        "200": {
+                            "content": {
+                                "application/json": {
+                                    "schema": {},
+                                },
+                            },
+                            "description": "Successful Response",
+                        },
+                    },
+                    "summary": "Read Updated Attribute",
+                },
+            },
+        },
+    }