diff --git a/tests/conftest.py b/tests/conftest.py
index 724ca65d3..4db3ae018 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -1,13 +1,12 @@
 from __future__ import annotations
 
 import functools
-from typing import Any, Callable, Literal
+from typing import Any, Literal
 
 import pytest
 
 from starlette.testclient import TestClient
-
-TestClientFactory = Callable[..., TestClient]
+from tests.types import TestClientFactory
 
 
 @pytest.fixture
diff --git a/tests/middleware/test_base.py b/tests/middleware/test_base.py
index 2176404d8..3ad1751a2 100644
--- a/tests/middleware/test_base.py
+++ b/tests/middleware/test_base.py
@@ -5,7 +5,6 @@
 from typing import (
     Any,
     AsyncGenerator,
-    Callable,
     Generator,
 )
 
@@ -23,8 +22,7 @@
 from starlette.testclient import TestClient
 from starlette.types import ASGIApp, Message, Receive, Scope, Send
 from starlette.websockets import WebSocket
-
-TestClientFactory = Callable[[ASGIApp], TestClient]
+from tests.types import TestClientFactory
 
 
 class CustomMiddleware(BaseHTTPMiddleware):
diff --git a/tests/middleware/test_cors.py b/tests/middleware/test_cors.py
index 09ec9513f..630361243 100644
--- a/tests/middleware/test_cors.py
+++ b/tests/middleware/test_cors.py
@@ -1,15 +1,10 @@
-from typing import Callable
-
 from starlette.applications import Starlette
 from starlette.middleware import Middleware
 from starlette.middleware.cors import CORSMiddleware
 from starlette.requests import Request
 from starlette.responses import PlainTextResponse
 from starlette.routing import Route
-from starlette.testclient import TestClient
-from starlette.types import ASGIApp
-
-TestClientFactory = Callable[[ASGIApp], TestClient]
+from tests.types import TestClientFactory
 
 
 def test_cors_allow_all(
diff --git a/tests/middleware/test_errors.py b/tests/middleware/test_errors.py
index a2dbabd8a..e32f406ae 100644
--- a/tests/middleware/test_errors.py
+++ b/tests/middleware/test_errors.py
@@ -1,4 +1,4 @@
-from typing import Any, Callable
+from typing import Any
 
 import pytest
 
@@ -8,10 +8,8 @@
 from starlette.requests import Request
 from starlette.responses import JSONResponse, Response
 from starlette.routing import Route
-from starlette.testclient import TestClient
 from starlette.types import Receive, Scope, Send
-
-TestClientFactory = Callable[..., TestClient]
+from tests.types import TestClientFactory
 
 
 def test_handler(
diff --git a/tests/middleware/test_gzip.py b/tests/middleware/test_gzip.py
index 5bfecadb7..b6f68296d 100644
--- a/tests/middleware/test_gzip.py
+++ b/tests/middleware/test_gzip.py
@@ -1,15 +1,10 @@
-from typing import Callable
-
 from starlette.applications import Starlette
 from starlette.middleware import Middleware
 from starlette.middleware.gzip import GZipMiddleware
 from starlette.requests import Request
 from starlette.responses import ContentStream, PlainTextResponse, StreamingResponse
 from starlette.routing import Route
-from starlette.testclient import TestClient
-from starlette.types import ASGIApp
-
-TestClientFactory = Callable[[ASGIApp], TestClient]
+from tests.types import TestClientFactory
 
 
 def test_gzip_responses(test_client_factory: TestClientFactory) -> None:
diff --git a/tests/middleware/test_https_redirect.py b/tests/middleware/test_https_redirect.py
index 9195694a3..22dfc14b6 100644
--- a/tests/middleware/test_https_redirect.py
+++ b/tests/middleware/test_https_redirect.py
@@ -1,14 +1,10 @@
-from typing import Callable
-
 from starlette.applications import Starlette
 from starlette.middleware import Middleware
 from starlette.middleware.httpsredirect import HTTPSRedirectMiddleware
 from starlette.requests import Request
 from starlette.responses import PlainTextResponse
 from starlette.routing import Route
-from starlette.testclient import TestClient
-
-TestClientFactory = Callable[..., TestClient]
+from tests.types import TestClientFactory
 
 
 def test_https_redirect_middleware(test_client_factory: TestClientFactory) -> None:
diff --git a/tests/middleware/test_session.py b/tests/middleware/test_session.py
index 4fbeec88c..9a0d70a0d 100644
--- a/tests/middleware/test_session.py
+++ b/tests/middleware/test_session.py
@@ -1,5 +1,4 @@
 import re
-from typing import Callable
 
 from starlette.applications import Starlette
 from starlette.middleware import Middleware
@@ -8,8 +7,7 @@
 from starlette.responses import JSONResponse
 from starlette.routing import Mount, Route
 from starlette.testclient import TestClient
-
-TestClientFactory = Callable[..., TestClient]
+from tests.types import TestClientFactory
 
 
 def view_session(request: Request) -> JSONResponse:
diff --git a/tests/middleware/test_trusted_host.py b/tests/middleware/test_trusted_host.py
index 466302210..ddff46c48 100644
--- a/tests/middleware/test_trusted_host.py
+++ b/tests/middleware/test_trusted_host.py
@@ -1,14 +1,10 @@
-from typing import Callable
-
 from starlette.applications import Starlette
 from starlette.middleware import Middleware
 from starlette.middleware.trustedhost import TrustedHostMiddleware
 from starlette.requests import Request
 from starlette.responses import PlainTextResponse
 from starlette.routing import Route
-from starlette.testclient import TestClient
-
-TestClientFactory = Callable[..., TestClient]
+from tests.types import TestClientFactory
 
 
 def test_trusted_host_middleware(test_client_factory: TestClientFactory) -> None:
diff --git a/tests/middleware/test_wsgi.py b/tests/middleware/test_wsgi.py
index 69842d3ad..58696bb65 100644
--- a/tests/middleware/test_wsgi.py
+++ b/tests/middleware/test_wsgi.py
@@ -5,10 +5,9 @@
 
 from starlette._utils import collapse_excgroups
 from starlette.middleware.wsgi import WSGIMiddleware, build_environ
-from starlette.testclient import TestClient
+from tests.types import TestClientFactory
 
 WSGIResponse = Iterable[bytes]
-TestClientFactory = Callable[..., TestClient]
 StartResponse = Callable[..., Any]
 Environment = Dict[str, Any]
 
diff --git a/tests/test_applications.py b/tests/test_applications.py
index af3cdda6c..20da7ea81 100644
--- a/tests/test_applications.py
+++ b/tests/test_applications.py
@@ -1,7 +1,7 @@
 import os
 from contextlib import asynccontextmanager
 from pathlib import Path
-from typing import AsyncGenerator, AsyncIterator, Callable, Generator
+from typing import AsyncGenerator, AsyncIterator, Generator
 
 import anyio
 import pytest
@@ -20,8 +20,7 @@
 from starlette.testclient import TestClient
 from starlette.types import ASGIApp, Receive, Scope, Send
 from starlette.websockets import WebSocket
-
-TestClientFactory = Callable[..., TestClient]
+from tests.types import TestClientFactory
 
 
 async def error_500(request: Request, exc: HTTPException) -> JSONResponse:
diff --git a/tests/test_authentication.py b/tests/test_authentication.py
index ecddda75e..35c1110d1 100644
--- a/tests/test_authentication.py
+++ b/tests/test_authentication.py
@@ -21,10 +21,9 @@
 from starlette.requests import HTTPConnection, Request
 from starlette.responses import JSONResponse, Response
 from starlette.routing import Route, WebSocketRoute
-from starlette.testclient import TestClient
 from starlette.websockets import WebSocket, WebSocketDisconnect
+from tests.types import TestClientFactory
 
-TestClientFactory = Callable[..., TestClient]
 AsyncEndpoint = Callable[..., Awaitable[Response]]
 SyncEndpoint = Callable[..., Response]
 
diff --git a/tests/test_background.py b/tests/test_background.py
index 846deecfd..cbffcc06a 100644
--- a/tests/test_background.py
+++ b/tests/test_background.py
@@ -1,13 +1,9 @@
-from typing import Callable
-
 import pytest
 
 from starlette.background import BackgroundTask, BackgroundTasks
 from starlette.responses import Response
-from starlette.testclient import TestClient
 from starlette.types import Receive, Scope, Send
-
-TestClientFactory = Callable[..., TestClient]
+from tests.types import TestClientFactory
 
 
 def test_async_task(test_client_factory: TestClientFactory) -> None:
diff --git a/tests/test_concurrency.py b/tests/test_concurrency.py
index aba3ceb1a..bac6814e4 100644
--- a/tests/test_concurrency.py
+++ b/tests/test_concurrency.py
@@ -1,5 +1,5 @@
 from contextvars import ContextVar
-from typing import Callable, Iterator
+from typing import Iterator
 
 import anyio
 import pytest
@@ -9,9 +9,7 @@
 from starlette.requests import Request
 from starlette.responses import Response
 from starlette.routing import Route
-from starlette.testclient import TestClient
-
-TestClientFactory = Callable[..., TestClient]
+from tests.types import TestClientFactory
 
 
 @pytest.mark.anyio
diff --git a/tests/test_convertors.py b/tests/test_convertors.py
index 72ee17a82..520c98767 100644
--- a/tests/test_convertors.py
+++ b/tests/test_convertors.py
@@ -1,5 +1,5 @@
 from datetime import datetime
-from typing import Callable, Iterator
+from typing import Iterator
 
 import pytest
 
@@ -8,9 +8,7 @@
 from starlette.requests import Request
 from starlette.responses import JSONResponse
 from starlette.routing import Route, Router
-from starlette.testclient import TestClient
-
-TestClientFactory = Callable[..., TestClient]
+from tests.types import TestClientFactory
 
 
 @pytest.fixture(scope="module", autouse=True)
diff --git a/tests/test_endpoints.py b/tests/test_endpoints.py
index eeb0f2322..8f201e25b 100644
--- a/tests/test_endpoints.py
+++ b/tests/test_endpoints.py
@@ -1,4 +1,4 @@
-from typing import Callable, Iterator
+from typing import Iterator
 
 import pytest
 
@@ -8,8 +8,7 @@
 from starlette.routing import Route, Router
 from starlette.testclient import TestClient
 from starlette.websockets import WebSocket
-
-TestClientFactory = Callable[..., TestClient]
+from tests.types import TestClientFactory
 
 
 class Homepage(HTTPEndpoint):
diff --git a/tests/test_exceptions.py b/tests/test_exceptions.py
index 401ad8212..f4e91ad87 100644
--- a/tests/test_exceptions.py
+++ b/tests/test_exceptions.py
@@ -1,5 +1,5 @@
 import warnings
-from typing import Callable, Generator
+from typing import Generator
 
 import pytest
 
@@ -10,8 +10,7 @@
 from starlette.routing import Route, Router, WebSocketRoute
 from starlette.testclient import TestClient
 from starlette.types import Receive, Scope, Send
-
-TestClientFactory = Callable[..., TestClient]
+from tests.types import TestClientFactory
 
 
 def raise_runtime_error(request: Request) -> None:
diff --git a/tests/test_formparsers.py b/tests/test_formparsers.py
index ed2226878..8d97a0ba7 100644
--- a/tests/test_formparsers.py
+++ b/tests/test_formparsers.py
@@ -13,10 +13,8 @@
 from starlette.requests import Request
 from starlette.responses import JSONResponse
 from starlette.routing import Mount
-from starlette.testclient import TestClient
 from starlette.types import ASGIApp, Receive, Scope, Send
-
-TestClientFactory = typing.Callable[..., TestClient]
+from tests.types import TestClientFactory
 
 
 class ForceMultipartDict(typing.Dict[typing.Any, typing.Any]):
diff --git a/tests/test_requests.py b/tests/test_requests.py
index c52ebc141..02f29ee35 100644
--- a/tests/test_requests.py
+++ b/tests/test_requests.py
@@ -1,7 +1,7 @@
 from __future__ import annotations
 
 import sys
-from typing import Any, Callable, Iterator
+from typing import Any, Iterator
 
 import anyio
 import pytest
@@ -9,10 +9,8 @@
 from starlette.datastructures import Address, State
 from starlette.requests import ClientDisconnect, Request
 from starlette.responses import JSONResponse, PlainTextResponse, Response
-from starlette.testclient import TestClient
 from starlette.types import Message, Receive, Scope, Send
-
-TestClientFactory = Callable[..., TestClient]
+from tests.types import TestClientFactory
 
 
 def test_request_url(test_client_factory: TestClientFactory) -> None:
diff --git a/tests/test_responses.py b/tests/test_responses.py
index f05529dd7..791e9b3ac 100644
--- a/tests/test_responses.py
+++ b/tests/test_responses.py
@@ -5,7 +5,7 @@
 import time
 from http.cookies import SimpleCookie
 from pathlib import Path
-from typing import AsyncIterator, Callable, Iterator
+from typing import AsyncIterator, Iterator
 
 import anyio
 import pytest
@@ -23,8 +23,7 @@
 )
 from starlette.testclient import TestClient
 from starlette.types import Message, Receive, Scope, Send
-
-TestClientFactory = Callable[..., TestClient]
+from tests.types import TestClientFactory
 
 
 def test_text_response(test_client_factory: TestClientFactory) -> None:
diff --git a/tests/test_routing.py b/tests/test_routing.py
index 03c31c67f..1490723b4 100644
--- a/tests/test_routing.py
+++ b/tests/test_routing.py
@@ -17,8 +17,7 @@
 from starlette.testclient import TestClient
 from starlette.types import ASGIApp, Message, Receive, Scope, Send
 from starlette.websockets import WebSocket, WebSocketDisconnect
-
-TestClientFactory = typing.Callable[..., TestClient]
+from tests.types import TestClientFactory
 
 
 def homepage(request: Request) -> Response:
diff --git a/tests/test_schemas.py b/tests/test_schemas.py
index e00b2b8de..f4a5b4ad9 100644
--- a/tests/test_schemas.py
+++ b/tests/test_schemas.py
@@ -1,20 +1,16 @@
-from typing import Callable
-
 from starlette.applications import Starlette
 from starlette.endpoints import HTTPEndpoint
 from starlette.requests import Request
 from starlette.responses import Response
 from starlette.routing import Host, Mount, Route, Router, WebSocketRoute
 from starlette.schemas import SchemaGenerator
-from starlette.testclient import TestClient
 from starlette.websockets import WebSocket
+from tests.types import TestClientFactory
 
 schemas = SchemaGenerator(
     {"openapi": "3.0.0", "info": {"title": "Example API", "version": "1.0"}}
 )
 
-TestClientFactory = Callable[..., TestClient]
-
 
 def ws(session: WebSocket) -> None:
     """ws"""
diff --git a/tests/test_staticfiles.py b/tests/test_staticfiles.py
index 085301302..65d71b97b 100644
--- a/tests/test_staticfiles.py
+++ b/tests/test_staticfiles.py
@@ -16,9 +16,7 @@
 from starlette.responses import Response
 from starlette.routing import Mount
 from starlette.staticfiles import StaticFiles
-from starlette.testclient import TestClient
-
-TestClientFactory = typing.Callable[..., TestClient]
+from tests.types import TestClientFactory
 
 
 def test_staticfiles(tmpdir: Path, test_client_factory: TestClientFactory) -> None:
diff --git a/tests/test_templates.py b/tests/test_templates.py
index 10a1366bc..8e344f331 100644
--- a/tests/test_templates.py
+++ b/tests/test_templates.py
@@ -1,7 +1,6 @@
 from __future__ import annotations
 
 import os
-import typing
 from pathlib import Path
 from unittest import mock
 
@@ -16,9 +15,7 @@
 from starlette.responses import Response
 from starlette.routing import Route
 from starlette.templating import Jinja2Templates
-from starlette.testclient import TestClient
-
-TestClientFactory = typing.Callable[..., TestClient]
+from tests.types import TestClientFactory
 
 
 def test_templates(tmpdir: Path, test_client_factory: TestClientFactory) -> None:
diff --git a/tests/test_testclient.py b/tests/test_testclient.py
index 4ed1ced9a..77de3d976 100644
--- a/tests/test_testclient.py
+++ b/tests/test_testclient.py
@@ -4,7 +4,7 @@
 import sys
 from asyncio import Task, current_task as asyncio_current_task
 from contextlib import asynccontextmanager
-from typing import Any, AsyncGenerator, Callable
+from typing import Any, AsyncGenerator
 
 import anyio
 import anyio.lowlevel
@@ -20,8 +20,7 @@
 from starlette.testclient import ASGIInstance, TestClient
 from starlette.types import ASGIApp, Receive, Scope, Send
 from starlette.websockets import WebSocket, WebSocketDisconnect
-
-TestClientFactory = Callable[..., TestClient]
+from tests.types import TestClientFactory
 
 
 def mock_service_endpoint(request: Request) -> JSONResponse:
@@ -212,7 +211,7 @@ async def inner(receive: Receive, send: Send) -> None:
 
         return inner
 
-    client = test_client_factory(app)
+    client = test_client_factory(app)  # type: ignore
     response = client.get("/")
     assert response.text == "Hello, world!"
 
@@ -252,7 +251,7 @@ async def asgi(receive: Receive, send: Send) -> None:
 
         return asgi
 
-    client = test_client_factory(app)
+    client = test_client_factory(app)  # type: ignore
     with client.websocket_connect("/") as websocket:
         data = websocket.receive_json()
         assert data == {"message": "test"}
@@ -268,7 +267,7 @@ async def asgi(receive: Receive, send: Send) -> None:
 
         return asgi
 
-    client = test_client_factory(app)
+    client = test_client_factory(app)  # type: ignore
     with client.websocket_connect("/") as websocket:
         ...
     assert websocket.should_close.is_set()
diff --git a/tests/test_websockets.py b/tests/test_websockets.py
index 95ffbdbe7..16d2d0f1f 100644
--- a/tests/test_websockets.py
+++ b/tests/test_websockets.py
@@ -1,5 +1,5 @@
 import sys
-from typing import Any, Callable, MutableMapping
+from typing import Any, MutableMapping
 
 import anyio
 import pytest
@@ -7,11 +7,10 @@
 
 from starlette import status
 from starlette.responses import Response
-from starlette.testclient import TestClient, WebSocketDenialResponse
+from starlette.testclient import WebSocketDenialResponse
 from starlette.types import Message, Receive, Scope, Send
 from starlette.websockets import WebSocket, WebSocketDisconnect, WebSocketState
-
-TestClientFactory = Callable[..., TestClient]
+from tests.types import TestClientFactory
 
 
 def test_websocket_url(test_client_factory: TestClientFactory) -> None:
diff --git a/tests/types.py b/tests/types.py
new file mode 100644
index 000000000..1cbacf107
--- /dev/null
+++ b/tests/types.py
@@ -0,0 +1,26 @@
+from __future__ import annotations
+
+from typing import TYPE_CHECKING, Protocol
+
+import httpx
+
+from starlette.testclient import TestClient
+from starlette.types import ASGIApp
+
+if TYPE_CHECKING:
+
+    class TestClientFactory(Protocol):  # pragma: no cover
+        def __call__(
+            self,
+            app: ASGIApp,
+            base_url: str = "http://testserver",
+            raise_server_exceptions: bool = True,
+            root_path: str = "",
+            cookies: httpx._types.CookieTypes | None = None,
+            headers: dict[str, str] | None = None,
+            follow_redirects: bool = True,
+        ) -> TestClient: ...
+else:  # pragma: no cover
+
+    class TestClientFactory:
+        __test__ = False