adding null stream test
adding null stream test

nytlabs/st-core,mikedewar/st-core,mikedewar/st-core,nikhan/st-core,mikedewar/st-core,nytlabs/st-core,nikhan/st-core,nikhan/st-core,nikhan/st-core,mikedewar/st-core,nytlabs/st-core,nytlabs/st-core