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:
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Running the app throught systemctl: if your app is started from /opt/nodejs/bin, so a sybaseConfig.properties must exists on /opt/nodejs/bin
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Running mocha tests: the sybaseConfig.properties must exists on the same directory that you executed mocha command