javascript fizzbuzz

FizzBuzzSpec.js

describe('FizzBuzz', function(){
  it('should say number', function(){
    expect(fizzBuzz.say(1)).toEqual(1);
  });
  it('should say fizz on 3', function(){
    expect(fizzBuzz.say(3)).toEqual('fizz');
  });
  it('should say buzz on 5', function(){
    expect(fizzBuzz.say(5)).toEqual('buzz');
  });
  it('should say fizzbuzz on 15', function(){
    expect(fizzBuzz.say(15)).toEqual('fizzbuzz');
  });
});
var fizzBuzz = (function () {
  var say = function (number){
    if (number % 3 == 0 && number % 5 == 0) {
      return 'fizzbuzz';
    } else if (number % 3 == 0) {
      return 'fizz';
    } else if (number % 5 == 0) {
      return 'buzz';
    }
    return number;
  };
  return {
    say: say
  };
}());

How can I use this fizzBuzz variable?

In node repl, in my expect:

var fizzBuzz = require('./FizzBuzzSpec.js')
But it does not work:
ReferenceError: describe is not defined
Then I commented out describe block, but it does also not work.

copy and paste from var fizzBuzz [line:15] to }()); [line:29],
then

for (var i = 1; i<=100; i++) { console.log(fizzBuzz.say(i)) }
I soloved my executing problem.