change CreateOpts from structure to map to avoid default null values
diff --git a/acceptance/openstack/blockstorage_test.go b/acceptance/openstack/blockstorage_test.go
index ad40590..31a2d6b 100644
--- a/acceptance/openstack/blockstorage_test.go
+++ b/acceptance/openstack/blockstorage_test.go
@@ -61,10 +61,12 @@
 		return
 	}
 	v, err := volumes.Create(client, volumes.CreateOpts{
-		Size: 1,
+		"size":         1,
+		"display_name": "test-volume",
 	})
 	if err != nil {
 		t.Error(err)
 		return
 	}
+	fmt.Printf("%+v\n", v)
 }