text: var fs = require('./fibonacci.js');
  
  console.log("Calculating Fibonacci sequence");
  console.log("-7: " + fs.calculate(-7));
  console.log("-1: " + fs.calculate(-1));
  console.log("0: " + fs.calculate(0));
  console.log("1: " + fs.calculate(1));
  console.log("2: " + fs.calculate(2));
  console.log("4: " + fs.calculate(4));
  console.log("7: " + fs.calculate(7));