Solution

src/splitInteger.test.js

@@ -3,11 +3,33 @@
 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(8, 1)).toEqual([8]);
+  expect(splitInteger(6, 2)).toEqual([3, 3]);
+});
 
-test(`should return a part equals to a value
-  when splitting into 1 part`, () => {});
+test(`should split a number into as equal parts as possible
+  and return exactly numberOfParts elements`, () => {
+  const result = splitInteger(17, 4);
 
-test('should sort parts ascending if they are not equal', () => {});
+  expect(result).toEqual([4, 4, 4, 5]);
+  expect(result).toHaveLength(4);
+});
 
-test('should add zeros if value < numberOfParts', () => {});
+test('should sort parts ascending if they are not equal', () => {
+  const result = splitInteger(32, 6);
+
+  expect(result).toEqual([5, 5, 5, 5, 6, 6]);
+  expect(result).toEqual(result.slice().sort((a, b) => a - b));
+});
+
+test('should keep the difference between max and min values <= 1', () => {
+  const result = splitInteger(7, 3);
+
+  expect(Math.max(...result) - Math.min(...result)).toBeLessThanOrEqual(1);
+  expect(result).toEqual([2, 2, 3]);
+});
+
+test('should include zeros when value is smaller than numberOfParts', () => {
+  expect(splitInteger(2, 4)).toEqual([0, 0, 1, 1]);
+});