Add splitInteger tests

README.md

@@ -1,4 +1,4 @@
-# QA: Split integer ([uk](readme.uk.md))
+# QA: Split integer ([uk](https://github.com/AndrzejFront/js_split_integer/blob/main/readme.uk.md))
 
 Write tests for `splitInteger` function that takes 2 positive integers `value`
 and `numberOfParts` and returns an array containing exactly `numberOfParts`

src/splitInteger.test.js

@@ -3,11 +3,54 @@
 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(6, 2)).toEqual([3, 3]);
+});
 
 test(`should return a part equals to a value
-  when splitting into 1 part`, () => {});
+  when splitting into 1 part`, () => {
+  expect(splitInteger(8, 1)).toEqual([8]);
+});
 
-test('should sort parts ascending if they are not equal', () => {});
+test('should sort parts ascending if they are not equal', () => {
+  expect(splitInteger(17, 4)).toEqual([4, 4, 4, 5]);
+  expect(splitInteger(32, 6)).toEqual([5, 5, 5, 5, 6, 6]);
+  expect(splitInteger(29, 3)).toEqual([9, 10, 10]);
+});
 
-test('should add zeros if value < numberOfParts', () => {});
+test('should add zeros if value < numberOfParts', () => {
+  expect(splitInteger(3, 5)).toEqual([0, 0, 1, 1, 1]);
+});
+
+test('should split the smallest positive value', () => {
+  expect(splitInteger(1, 1)).toEqual([1]);
+  expect(splitInteger(1, 4)).toEqual([0, 0, 0, 1]);
+});
+
+test('should return ones if value equals numberOfParts', () => {
+  expect(splitInteger(4, 4)).toEqual([1, 1, 1, 1]);
+});
+
+test('should return exactly numberOfParts elements', () => {
+  expect(splitInteger(23, 7)).toHaveLength(7);
+});
+
+test('should preserve the total value', () => {
+  const parts = splitInteger(23, 7);
+
+  expect(parts.reduce((sum, part) => sum + part, 0)).toBe(23);
+});
+
+test('should return only integer parts', () => {
+  const parts = splitInteger(23, 7);
+
+  parts.forEach((part) => {
+    expect(Number.isInteger(part)).toBe(true);
+  });
+});
+
+test('should keep the difference between max and min parts at most 1', () => {
+  const parts = splitInteger(23, 7);
+
+  expect(Math.max(...parts) - Math.min(...parts)).toBeLessThanOrEqual(1);
+});