describe('pingPong', function() {
  it("is true for a number that is divisible by 3", function() {
    expect(pingPong(6)).to.equal(true);
  });

  it("is true for a number that is divisible by 5", function() {
    expect(pingPong(10)).to.equal(true);
  });

});

describe('pingPong', function() {
  it("is true for a number that is divisible by 3", function() {
    expect(pingPong(6)).to.equal(true);
  });

  it("is true for a number that is divisible by 5", function() {
    expect(pingPong(10)).to.equal(true);
  });

  it("is true for a number that is divisible by 15", function() {
    expect(pingPong(30)).to.equal.(true);
  });

});

Add an additional spec test for userNumbers divisible by 15
Add an additional spec test for userNumbers divisible by 15
