Install NENE2 (PHP) first

The npm client does not include a server. Start NENE2 before client.smoke().

git clone https://github.com/hideyukiMORI/NENE2.git
cd NENE2
composer install
# follow NENE2 docs — default http://localhost:8080

Docs: https://hideyukimori.github.io/NENE2/

Then Getting started.