@parithon's example of binding this to resolve the issue with our tests for these functions while attempting to wrap in a spy from sinonjs

stream.js

function startMonitoring(milliseconds) {
  return getStatusEvery.bind(this).(milliseconds)
}

function getStatusEvery(milliseconds) {
  this.getStreamStatus();
  return setInterval(this.getStreamStatus, milliseconds);
}