Add regression test for OAS3.0 array containing null unmarshalling

Author: p1c2u

tests/integration/unmarshalling/test_unmarshallers.py

@@ -73,6 +73,23 @@ def test_no_type(self, unmarshallers_factory, value):
 
         assert result == value
 
+    @pytest.mark.parametrize(
+        "factory",
+        [
+            oas30_write_schema_unmarshallers_factory,
+            oas31_schema_unmarshallers_factory,
+        ],
+    )
+    def test_no_type_object_with_array_of_null(self, factory):
+        schema = {}
+        spec = SchemaPath.from_dict(schema)
+        unmarshaller = factory.create(spec)
+        value = {"foo": [None]}
+
+        result = unmarshaller.unmarshal(value)
+
+        assert result == value
+
     @pytest.mark.parametrize(
         "type,value",
         [