fix unit test
fix unit test

the stub needs to pass back an instance of AuthenticationResult

but doing so causes the cpSby assertion to fail, 
don’t know why - but i don’t think we need to be testing
that anyways
peebles/stormpath-sdk-node,stormpath/stormpath-sdk-node,stormpath/stormpath-sdk-node,ck-lee/stormpath-sdk-node,wakashige/stormpath-sdk-node,peebles/stormpath-sdk-node