Implement a solution for fizzbuzz problem, write tests

Author: somekindofwallflower

05_fizzbuzz/index.js

@@ -0,0 +1,32 @@
+// --- Directions
+// Write a program that console logs the numbers
+// from 1 to n. But for multiples of three print
+// “fizz” instead of the number and for the multiples
+// of five print “buzz”. For numbers which are multiples
+// of both three and five print “fizzbuzz”.
+// --- Example
+//   fizzBuzz(5);
+//   1
+//   2
+//   fizz
+//   4
+//   buzz
+
+function fizzBuzz(n) {
+    for (let i = 1; i <= n; i++) {
+        // Is the number multiple of 3 and 5?
+        if(i % 3 === 0 && i % 5 === 0) {
+            console.log('fizzbuzz');
+        // Is the number multiple of 3?
+        } else if (i % 3 === 0) {
+            console.log('fizz');
+        // Is the number multiple of 5?
+        } else if (i % 5 === 0) {
+            console.log('buzz');
+        } else {
+            console.log(i);
+        }
+    }
+}
+
+module.exports = fizzBuzz;

05_fizzbuzz/test.js

@@ -0,0 +1,39 @@
+const fizzBuzz = require('./index');
+
+test('fizzBuzz function is defined', () => {
+    expect(fizzBuzz).toBeDefined();
+});
+
+test('Calling fizzbuzz with `5` prints out 5 statements', () => {
+    fizzBuzz(5);
+
+    expect(console.log.mock.calls.length).toEqual(5);
+});
+
+test('Calling fizzbuzz with 15 prints out the correct values', () => {
+    fizzBuzz(15);
+
+    expect(console.log.mock.calls[0][0]).toEqual(1);
+    expect(console.log.mock.calls[1][0]).toEqual(2);
+    expect(console.log.mock.calls[2][0]).toEqual('fizz');
+    expect(console.log.mock.calls[3][0]).toEqual(4);
+    expect(console.log.mock.calls[4][0]).toEqual('buzz');
+    expect(console.log.mock.calls[5][0]).toEqual('fizz');
+    expect(console.log.mock.calls[6][0]).toEqual(7);
+    expect(console.log.mock.calls[7][0]).toEqual(8);
+    expect(console.log.mock.calls[8][0]).toEqual('fizz');
+    expect(console.log.mock.calls[9][0]).toEqual('buzz');
+    expect(console.log.mock.calls[10][0]).toEqual(11);
+    expect(console.log.mock.calls[11][0]).toEqual('fizz');
+    expect(console.log.mock.calls[12][0]).toEqual(13);
+    expect(console.log.mock.calls[13][0]).toEqual(14);
+    expect(console.log.mock.calls[14][0]).toEqual('fizzbuzz');
+});
+
+beforeEach(() => {
+    jest.spyOn(console, 'log');
+});
+
+afterEach(() => {
+    console.log.mockRestore();
+});