Add negative nodeType schema tests

Author: handrews

tests/schema/fail/xml-attr-exclusion.yaml

@@ -0,0 +1,11 @@
+openapi: 3.2.0
+info:
+  title: API
+  version: 1.0.0
+components:
+  schemas:
+    Attr:
+      type: string
+      xml:
+        attribute: true
+        nodeType: attribute

tests/schema/fail/xml-wrapped-exclusion.yaml

@@ -0,0 +1,11 @@
+openapi: 3.2.0
+info:
+  title: API
+  version: 1.0.0
+components:
+  schemas:
+    List:
+      type: array
+      xml:
+        wrapped: true
+        nodeType: element