Solution

package.json

@@ -5,7 +5,7 @@
   "scripts": {
     "init": "mate-scripts init",
     "start": "mate-scripts start",
-    "format": "prettier --ignore-path .prettierignore --write './src/**/*.js'",
+    "format": "prettier --ignore-path .prettierignore --write ./src/**/*.js",
     "lint": "npm run format && mate-scripts lint",
     "test:only": "mate-scripts test",
     "update": "mate-scripts update",

src/splitInteger.test.js

@@ -3,11 +3,23 @@
 const splitInteger = require('./splitInteger');
 
 test(`should split a number into equal parts
-  if a value is divisible by a numberOfParts`, () => {});
+  if a value is divisible by a numberOfParts`, () => {
+  expect(splitInteger(12, 3)).toEqual([4, 4, 4]);
+});
 
 test(`should return a part equals to a value
-  when splitting into 1 part`, () => {});
+  when splitting into 1 part`, () => {
+  expect(splitInteger(7, 1)).toEqual([7]);
+});
 
-test('should sort parts ascending if they are not equal', () => {});
+test('should sort parts ascending if they are not equal', () => {
+  const result = splitInteger(10, 3);
 
-test('should add zeros if value < numberOfParts', () => {});
+  const sorted = [...result].sort((a, b) => a - b);
+
+  expect(result).toEqual(sorted);
+});
+
+test('should add zeros if value < numberOfParts', () => {
+  expect(splitInteger(3, 5)).toEqual([0, 0, 1, 1, 1]);
+});