✅ Update tests for Pydantic v2 JSON decode errors

Since we bypass json.loads and parse bytes directly via Pydantic, the JSON decode errors now return standard Pydantic v2 validation errors. Tests have been updated to expect this cleaner format.

tests/test_tutorial/test_body/test_tutorial001.py

@@ -147,10 +147,10 @@ def test_post_broken_body(client: TestClient):
         "detail": [
             {
                 "type": "json_invalid",
-                "loc": ["body", 1],
-                "msg": "JSON decode error",
-                "input": {},
-                "ctx": {"error": "Expecting property name enclosed in double quotes"},
+                "loc": ["body"],
+                "msg": "Invalid JSON: key must be a string at line 1 column 2",
+                "input": "{some broken json}",
+                "ctx": {"error": "key must be a string at line 1 column 2"},
             }
         ]
     }
@@ -246,7 +246,7 @@ def test_wrong_headers(client: TestClient):
 
 
 def test_other_exceptions(client: TestClient):
-    with patch("json.loads", side_effect=Exception):
+    with patch("fastapi.routing.Request.body", side_effect=Exception):
         response = client.post("/items/", json={"test": "test2"})
         assert response.status_code == 400, response.text