diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index def73e60..f5219f8c 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -2,7 +2,7 @@ name: Test
 
 on:
   pull_request:
-    branches: [ master ]
+    branches: [ main ]
 
 jobs:
   build:
diff --git a/.reviewrelatedfiles b/.reviewrelatedfiles
new file mode 100644
index 00000000..cc4c348e
--- /dev/null
+++ b/.reviewrelatedfiles
@@ -0,0 +1 @@
+src/**/*
diff --git a/src/splitInteger.js b/src/splitInteger.js
index dd5009ff..d3da7485 100644
--- a/src/splitInteger.js
+++ b/src/splitInteger.js
@@ -1,3 +1,5 @@
+'use strict';
+
 /**
  * @param {number} value
  * @param {number} numberOfParts
diff --git a/src/splitInteger.test.js b/src/splitInteger.test.js
index a610317d..023e3cd3 100644
--- a/src/splitInteger.test.js
+++ b/src/splitInteger.test.js
@@ -5,17 +5,34 @@ const splitInteger = require('./splitInteger');
 test(`should split a number into equal parts
   if a value is divisible by a numberOfParts`, () => {
 
+  const result = splitInteger(6, 2)
+
+  expect(result).toEqual([3, 3])
+  expect(result).toHaveLength(2)
 });
 
 test(`should return a part equals to a value
   when splitting into 1 part`, () => {
 
+  const result = splitInteger(8, 1)
+
+  expect(result).toEqual([8])
 });
 
 test('should sort parts ascending if they are not equal', () => {
 
+  const result = splitInteger(32, 6)
+  const diff = Math.max(...result) - Math.min(...result)
+
+  expect(result).toEqual([5, 5, 5, 5, 6, 6])
+  expect(result).toHaveLength(6)
+  expect(diff).toBeLessThanOrEqual(1)
 });
 
 test('should add zeros if value < numberOfParts', () => {
 
+  const result = splitInteger(1, 2)
+
+  expect(result).toEqual([0, 1])
+  expect(result).toHaveLength(2)
 });