VariablesAreInputTypesRule: add test for ignoring unknown types

Replicates graphql/graphql-js@ac8f0c6

Author: Cito

src/graphql/validation/rules/variables_are_input_types.py

@@ -22,7 +22,7 @@ def enter_variable_definition(
         type_ = type_from_ast(self.context.schema, node.type)
 
         # If the variable type is not an input type, return an error.
-        if type_ and not is_input_type(type_):
+        if type_ is not None and not is_input_type(type_):
             variable_name = node.variable.name.value
             type_name = print_ast(node.type)
             self.report_error(

tests/validation/test_known_type_names.py

@@ -37,7 +37,7 @@ def known_type_names_are_valid():
     def unknown_type_names_are_invalid():
         assert_errors(
             """
-            query Foo($var: JumbledUpLetters) {
+            query Foo($var: [JumbledUpLetters!]!) {
               user(id: 4) {
                 name
                 pets { ... on Badger { name }, ...PetFields, ... { name } }
@@ -50,7 +50,7 @@ def unknown_type_names_are_invalid():
             [
                 {
                     "message": "Unknown type 'JumbledUpLetters'.",
-                    "locations": [(2, 29)],
+                    "locations": [(2, 30)],
                 },
                 {"message": "Unknown type 'Badger'.", "locations": [(5, 31)]},
                 {

tests/validation/test_variables_are_input_types.py

@@ -10,6 +10,15 @@
 
 
 def describe_validate_variables_are_input_types():
+    def unknown_types_are_ignored():
+        assert_valid(
+            """
+            query Foo($a: Unknown, $b: [[Unknown!]]!) {
+              field(a: $a, b: $b)
+            }
+            """
+        )
+
     def input_types_are_valid():
         assert_valid(
             """