1var assert = require('assert');
2
3function fizzBuzz(n) {
4  let finalArr = [];
5
6  for (let i = 1; i <= n; i++) {
7    if (i % 3 === 0 && i % 5 === 0) {
8      finalArr.push('fizzbuzz');
9    } else if (i % 3 === 0) {
10      finalArr.push('fizz');
11    } else if (i % 5 === 0) {
12      finalArr.push('buzz');
13    } else {
14      finalArr.push(i.toString());
15    }
16  }
17
18  return finalArr.join('');
19}
20
21try {
22  assert.equal(fizzBuzz(0), '');
23
24  console.log('PASSED: ' + "Expect `fizzBuzz(0)` to equal `''`");
25} catch (err) {
26  console.log(err);
27}
28
29try {
30  assert.equal(fizzBuzz(1), '1');
31
32  console.log('PASSED: ' + "Expect `fizzBuzz(1)` to equal `'1'`");
33} catch (err) {
34  console.log(err);
35}
36
37try {
38  assert.equal(fizzBuzz(15), '12fizz4buzzfizz78fizzbuzz11fizz1314fizzbuzz');
39
40  console.log(
41    'PASSED: ' +
42      "Expect `fizzBuzz(15)` to equal `'12fizz4buzzfizz78fizzbuzz11fizz1314fizzbuzz'`"
43  );
44} catch (err) {
45  console.log(err);
46}
47
48try {
49  assertIsFunction(fizzBuzz, '`fizzBuzz` should be a function');
50
51  console.log('PASSED: ' + '`fizzBuzz` should be a function');
52} catch (err) {
53  console.log(err);
54}
55
56function assertIsFunction(f) {
57  return typeof f === 'function';
58}