added tests

src/splitInteger.js

@@ -1,4 +1,4 @@
-'use strict';
+"use strict";
 
 /**
  * @param {number} value

src/splitInteger.test.js

@@ -1,21 +1,52 @@
-'use strict';
+"use strict";
 
-const splitInteger = require('./splitInteger');
+const splitInteger = require("./splitInteger");
+
+function assertSplitProperties(value, numberOfParts) {
+  const result = splitInteger(value, numberOfParts);
+
+  expect(result).toHaveLength(numberOfParts);
+
+  expect(result.reduce((acc, val) => acc + val, 0)).toBe(value);
+
+  result.forEach((el) => expect(Number.isInteger(el)).toBe(true));
+
+  for (let i = 0; i < result.length - 1; i++) {
+    expect(result[i + 1]).toBeGreaterThanOrEqual(result[i]);
+  }
+
+  const min = Math.min(...result);
+  const max = Math.max(...result);
+
+  expect(max - min).toBeLessThanOrEqual(1);
+
+  return result;
+}
 
 test(`should split a number into equal parts
   if a value is divisible by a numberOfParts`, () => {
-
+  expect(assertSplitProperties(6, 2)).toEqual([3, 3]);
 });
 
 test(`should return a part equals to a value
   when splitting into 1 part`, () => {
+  expect(assertSplitProperties(8, 1)).toEqual([8]);
+});
+
+test("should sort parts ascending if they are not equal", () => {
+  const result = assertSplitProperties(17, 4);
 
+  expect(result).toEqual([4, 4, 4, 5]);
 });
 
-test('should sort parts ascending if they are not equal', () => {
+test("should add zeros if value < numberOfParts", () => {
+  const result = assertSplitProperties(5, 6);
 
+  expect(result).toContain(0);
 });
 
-test('should add zeros if value < numberOfParts', () => {
+test("should handle example splitInteger(32, 6)", () => {
+  const result = assertSplitProperties(32, 6);
 
+  expect(result).toEqual([5, 5, 5, 5, 6, 6]);
 });