Fix type name of FieldInfo namedtuple (#9124)

* Fix type name of `FieldInfo` namedtuple

* Add test

Author: Viicos

rest_framework/utils/model_meta.py

@@ -7,7 +7,7 @@
 """
 from collections import namedtuple
 
-FieldInfo = namedtuple('FieldResult', [
+FieldInfo = namedtuple('FieldInfo', [
     'pk',  # Model field instance
     'fields',  # Dict of field name -> model field instance
     'forward_relations',  # Dict of field name -> RelationInfo

tests/test_utils.py

@@ -9,6 +9,7 @@
 from rest_framework.utils import json
 from rest_framework.utils.breadcrumbs import get_breadcrumbs
 from rest_framework.utils.formatting import lazy_format
+from rest_framework.utils.model_meta import FieldInfo, RelationInfo
 from rest_framework.utils.urls import remove_query_param, replace_query_param
 from rest_framework.views import APIView
 from rest_framework.viewsets import ModelViewSet
@@ -267,3 +268,9 @@ def test_it_formats_lazily(self):
         assert message.format.call_count == 1
         str(formatted)
         assert message.format.call_count == 1
+
+
+class ModelMetaNamedTupleNames(TestCase):
+    def test_named_tuple_names(self):
+        assert FieldInfo.__name__ == 'FieldInfo'
+        assert RelationInfo.__name__ == 'RelationInfo'