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Md Ariful Haque @mah-shamim

How To Start Testing In PHP With PHPUnit Step-by-Step Guide

Install PHPUnit via Composer, create a sample class & test case, arrange, act, assert, run tests & expand with new methods for robust testing.

How to Start Testing in PHP with PHPUnit with a step-by-step guide.

  
  
  Step 1: Install PHPUnit

Before you start writing tests, you need to install PHPUnit in your project.
You can install it globally using Composer:

composer global require phpunit/phpunit

    
    

    
    




Or install it locally for a specific project:

composer require --dev phpunit/phpunit

    
    

    
    




Once installed, you can confirm the installation by running:

./vendor/bin/phpunit --version

    
    

    
    




  
  
  Step 2: Create a Sample Class to Test

Let’s create a simple Calculator...