Support fourfold nested lists

Replicates graphql/graphql-js@bec1b49

Author: Cito

src/graphql/utilities/get_introspection_query.py

@@ -4,9 +4,9 @@
 from ..language import DirectiveLocation
 
 try:
-    from typing import TypedDict, Literal
+    from typing import Literal, TypedDict
 except ImportError:  # Python < 3.8
-    from typing_extensions import TypedDict, Literal  # type: ignore
+    from typing_extensions import Literal, TypedDict  # type: ignore
 
 __all__ = [
     "get_introspection_query",
@@ -139,6 +139,14 @@ def input_deprecation(string: str) -> Optional[str]:
                       ofType {{
                         kind
                         name
+                        ofType {{
+                          kind
+                          name
+                          ofType {{
+                            kind
+                            name
+                          }}
+                        }}
                       }}
                     }}
                   }}

tests/utilities/test_build_client_schema.py

@@ -1,7 +1,5 @@
 from typing import cast
 
-from pytest import raises
-
 from graphql import graphql_sync
 from graphql.type import (
     GraphQLArgument,
@@ -18,8 +16,8 @@
     assert_enum_type,
 )
 from graphql.utilities import (
-    build_schema,
     build_client_schema,
+    build_schema,
     introspection_from_schema,
     print_schema,
 )
@@ -31,6 +29,7 @@
     IntrospectionType,
     IntrospectionUnionType,
 )
+from pytest import raises
 
 from ..utils import dedent
 
@@ -991,11 +990,11 @@ def throws_when_missing_directive_args():
                 build_client_schema(introspection)
 
     def describe_very_deep_decorators_are_not_supported():
-        def fails_on_very_deep_lists_more_than_7_levels():
+        def fails_on_very_deep_lists_more_than_8_levels():
             schema = build_schema(
                 """
                 type Query {
-                  foo: [[[[[[[[String]]]]]]]]
+                  foo: [[[[[[[[[[String]]]]]]]]]]
                 }
                 """
             )
@@ -1010,11 +1009,11 @@ def fails_on_very_deep_lists_more_than_7_levels():
                 " Decorated type deeper than introspection query."
             )
 
-        def fails_on_a_very_deep_non_null_more_than_7_levels():
+        def fails_on_a_very_deep_non_null_more_than_8_levels():
             schema = build_schema(
                 """
                 type Query {
-                  foo: [[[[String!]!]!]!]
+                  foo: [[[[[String!]!]!]!]!]
                 }
                 """
             )
@@ -1029,12 +1028,12 @@ def fails_on_a_very_deep_non_null_more_than_7_levels():
                 " Decorated type deeper than introspection query."
             )
 
-        def succeeds_on_deep_types_less_or_equal_7_levels():
-            # e.g., fully non-null 3D matrix
+        def succeeds_on_deep_types_less_or_equal_8_levels():
+            # e.g., fully non-null 4D matrix
             sdl = dedent(
                 """
                 type Query {
-                  foo: [[[String!]!]!]!
+                  foo: [[[[String!]!]!]!]!
                 }
                 """
             )