describe("analizOfNumber", function() {
  it("numbers divisible by 3 become 'ping'", function() {
    expect(analizOfNumber(6)).to.equal("ping");
  });

  it("numbers divisible by 5 become 'pong'", function() {
    expect(analizOfNumber(10)).to.equal("pong");
  });

  it("numbers divisible by 3 and 5 become 'pingpong'", function() {
    expect(analizOfNumber(15)).to.equal("pingpong");
  });

  it("number divisible by 3 and 5 have to be only 'pingpong'", function() {
    expect(analizOfNumber(30)).to.equal("pingpong");
  });

  it("number not divisible by 3 or 5 supposed to stay number", function() {
    expect(analizOfNumber(26)).to.equal(26);
  });
});

describe("pingPongSequence", function() {
  it("chosen number must be equal to sequence of elements according rulls", function() {
    expect(pingPongSequence(16)).to.eql([1, 2, "ping", 4, "pong", "ping", 7, 8, "ping", "pong", 11, "ping", 13, 14, "pingpong", 16]);
  });
});

@@ -694,24 +694,149 @@
 unction() %7B%0A
+  it(%22array length must be equal to user input%22, function () %7B%0A    expect(pingPongSequence(103)).to.have.length(103);%0A  %7D);%0A%0A
   it(%22chosen

add test code to check array length