diff --git a/src/splitInteger.test.js b/src/splitInteger.test.js
index a610317d..74e4480b 100644
--- a/src/splitInteger.test.js
+++ b/src/splitInteger.test.js
@@ -4,18 +4,51 @@ const splitInteger = require('./splitInteger');
 
 test(`should split a number into equal parts
   if a value is divisible by a numberOfParts`, () => {
+  const result = splitInteger(8, 2);
 
+  const min = Math.min(...result);
+  const max = Math.max(...result);
+
+  expect(max - min).toBeLessThanOrEqual(1);
+  expect(result).toStrictEqual([4, 4]);
 });
 
 test(`should return a part equals to a value
   when splitting into 1 part`, () => {
+  const result = splitInteger(6, 1);
 
+  expect(result[0]).toBe(6);
+  expect(result).toStrictEqual([6]);
 });
 
 test('should sort parts ascending if they are not equal', () => {
+  const result = splitInteger(5, 3);
+  const sorted = [...result].sort((a, b) => a - b);
+
+  const min = Math.min(...result);
+  const max = Math.max(...result);
 
+  expect(max - min).toBeLessThanOrEqual(1);
+  expect(result).toStrictEqual(sorted);
+  expect(result).toStrictEqual([1, 2, 2]);
 });
 
 test('should add zeros if value < numberOfParts', () => {
+  const result = splitInteger(6, 8);
+
+  function countZeros(arr) {
+    let count = 0;
+
+    for (const a of arr) {
+      if (a === 0) {
+        count++;
+      }
+    }
+
+    return count;
+  }
 
+  expect(result).toStrictEqual([0, 0, 1, 1, 1, 1, 1, 1]);
+  expect(countZeros(result)).toBe(2);
+  expect(result.reduce((a, b) => a + b, 0)).toBe(6);
 });