If you need to use the sybaseConfig.properties you should create the properties file at the same directory where you are running the node command to start you app.
i.e:
Running the app throught systemctl: if your app is started from /opt/nodejs/bin, so a sybaseConfig.properties must exists on /opt/nodejs/bin
Running mocha tests: the sybaseConfig.properties must exists on the same directory that you executed mocha command
If you need to use the sybaseConfig.properties you should create the properties file at the same directory where you are running the node command to start you app.
i.e:
Running the app throught systemctl: if your app is started from /opt/nodejs/bin, so a sybaseConfig.properties must exists on /opt/nodejs/bin
Running mocha tests: the sybaseConfig.properties must exists on the same directory that you executed mocha command