🧪 TDD with Vitest

How to test JavaScript code with Vitest

Use Vitest to create a few basic unit test for the algorithims in the previous lessons.

npm init -y
npm i -D vitest

Update the package.json with a test script.

file_type_npm package.json 
  "scripts": {
    "test": "vitest"
  },

Vitest Basic Example

import { expect, test } from 'vitest';

import { cumSum } from './sum';
test('cumulative sum of an array', () => {
  expect(cumSum([1, 3, 5, 7])).toBe(16);
  expect(cumSum([-2, -4, -8])).toBe(-14);
});

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