diff --git a/src/splitInteger.test.js b/src/splitInteger.test.js
index a610317d..27531da2 100644
--- a/src/splitInteger.test.js
+++ b/src/splitInteger.test.js
@@ -4,18 +4,39 @@ const splitInteger = require('./splitInteger');
 
 test(`should split a number into equal parts
   if a value is divisible by a numberOfParts`, () => {
-
+  expect(splitInteger(6, 3)).toEqual([2, 2, 2]);
+  expect(splitInteger(12, 4)).toEqual([3, 3, 3, 3]);
 });
 
 test(`should return a part equals to a value
   when splitting into 1 part`, () => {
-
+  expect(splitInteger(12, 1)).toEqual([12]);
+  expect(splitInteger(421, 1)).toEqual([421]);
 });
 
 test('should sort parts ascending if they are not equal', () => {
+  const result = splitInteger(15, 4);
 
+  expect(result).toEqual([3, 4, 4, 4]);
+  expect(result).toEqual([...result].sort((a, b) => a - b));
 });
 
 test('should add zeros if value < numberOfParts', () => {
-
+  const testCases = [
+    [8, 1],
+    [6, 2],
+    [17, 4],
+    [32, 6],
+    [0, 3],
+    [3, 5],
+    [1, 4],
+    [100, 9],
+  ];
+
+  for (const [value, parts] of testCases) {
+    const result = splitInteger(value, parts);
+    const sum = result.reduce((a, b) => a + b, 0);
+
+    expect(sum).toEqual(value);
+  }
 });