Solution

src/splitInteger.js

@@ -7,6 +7,16 @@
  * @returns {number[]}
  */
 function splitInteger(value, numberOfParts) {
+  if (value < numberOfParts) {
+    const output = [];
+
+    for (let i = 0; i < numberOfParts; i++) {
+      output[i] = 0;
+    }
+
+    return output;
+  }
+
   const parts = [];
   let rest = value;
 

src/splitInteger.test.js

@@ -1,21 +1,33 @@
 'use strict';
 
-const splitInteger = require('./splitInteger');
+const splitInteger = require('./splitInteger.js');
 
 test(`should split a number into equal parts
   if a value is divisible by a numberOfParts`, () => {
+  const value = [8, 8, 8, 8, 8, 8, 8, 8];
+  const recived = splitInteger(64, 8);
 
+  expect(value).toEqual(recived);
 });
 
 test(`should return a part equals to a value
   when splitting into 1 part`, () => {
+  const value = [9];
+  const recived = splitInteger(9, 1);
 
+  expect(value).toEqual(recived);
 });
 
 test('should sort parts ascending if they are not equal', () => {
+  const value = [5, 6, 6, 6];
+  const recived = splitInteger(23, 4);
 
+  expect(value).toEqual(recived);
 });
 
 test('should add zeros if value < numberOfParts', () => {
+  const value = [0, 0, 0, 0];
+  const recived = splitInteger(3, 4);
 
+  expect(value).toEqual(recived);
 });