From 0acd31576ba172c71ddaeb581e46d923e29d081f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Sebasti=C3=A1n=20Ram=C3=ADrez?= <tiangolo@gmail.com>
Date: Sun, 21 Dec 2025 16:31:11 +0100
Subject: [PATCH] =?UTF-8?q?=E2=9C=85=20Add=20test=20for=20warnings?=
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---
 .../test_pydantic_v1_deprecation_warnings.py  | 77 +++++++++++++++++++
 1 file changed, 77 insertions(+)
 create mode 100644 tests/test_pydantic_v1_deprecation_warnings.py

diff --git a/tests/test_pydantic_v1_deprecation_warnings.py b/tests/test_pydantic_v1_deprecation_warnings.py
new file mode 100644
index 000000000..00694c906
--- /dev/null
+++ b/tests/test_pydantic_v1_deprecation_warnings.py
@@ -0,0 +1,77 @@
+import sys
+
+import pytest
+
+from tests.utils import skip_module_if_py_gte_314
+
+if sys.version_info >= (3, 14):
+    skip_module_if_py_gte_314()
+
+from fastapi import FastAPI
+from fastapi._compat.v1 import BaseModel
+
+
+def test_warns_pydantic_v1_model_in_endpoint_param() -> None:
+    class ParamModelV1(BaseModel):
+        name: str
+
+    app = FastAPI()
+
+    with pytest.warns(
+        DeprecationWarning,
+        match=r"pydantic\.v1 is deprecated.*Please update the param data:",
+    ):
+
+        @app.post("/param")
+        def endpoint(data: ParamModelV1):
+            return data
+
+
+def test_warns_pydantic_v1_model_in_return_type() -> None:
+    class ReturnModelV1(BaseModel):
+        name: str
+
+    app = FastAPI()
+
+    with pytest.warns(
+        DeprecationWarning,
+        match=r"pydantic\.v1 is deprecated.*Please update the response model",
+    ):
+
+        @app.get("/return")
+        def endpoint() -> ReturnModelV1:
+            return ReturnModelV1(name="test")
+
+
+def test_warns_pydantic_v1_model_in_response_model() -> None:
+    class ResponseModelV1(BaseModel):
+        name: str
+
+    app = FastAPI()
+
+    with pytest.warns(
+        DeprecationWarning,
+        match=r"pydantic\.v1 is deprecated.*Please update the response model",
+    ):
+
+        @app.get("/response-model", response_model=ResponseModelV1)
+        def endpoint():
+            return {"name": "test"}
+
+
+def test_warns_pydantic_v1_model_in_additional_responses_model() -> None:
+    class ErrorModelV1(BaseModel):
+        detail: str
+
+    app = FastAPI()
+
+    with pytest.warns(
+        DeprecationWarning,
+        match=r"pydantic\.v1 is deprecated.*In responses=\{\}, please update",
+    ):
+
+        @app.get(
+            "/responses", response_model=None, responses={400: {"model": ErrorModelV1}}
+        )
+        def endpoint():
+            return {"ok": True}