How to get started Unit testing with PHPUnit ( basic stand alone example no frameworks )

Very Basic Example Test with PHPUnit

In this very quick tutorial, we will write our first unit test.

Step #1

Let’s create Basic-Example-Test-PHPUnit/composer.json
In this composer file add the following:

    "require-dev": {
        "phpunit/phpunit": "^9"
	"autoload": {
      "psr-4": {
    "config": {
    "optimize-autoloader": true

Step #2

We will create a tiny class in Basic-Example-Test-PHPUnit/src/Hello.php

The name of the directory “Basic-Example-Test-PHPUnit” is up to you, now in our class Hello we will simply say Hello to some $name variable.

namespace SimpleTest;
class Hello
	private $name;

	function __construct( $name )
		$this->name = $name;

	public function say_hello(){
		return 'Hello ' . $this->name;


Step #3

Awesome now let’s run composer install to bring in our dependencies.

$ composer install

Step #4

We can now write our test, create the test in Basic-Example-Test-PHPUnit/tests/HelloTest.php
in HelloTest add the following:

use PHPUnit\Framework\TestCase;
use SimpleTest\Hello;
class HelloTest extends TestCase

	public function testSayHello(): void
		$hello = new Hello( 'World' );
            'Hello World',

Read more about PHPUnit here:


Try working example code on GitHub

clone this

git clone


composer install

Run the Tests

Execute all tests declared in *Test.php sourcecode files in the tests directory.

./vendor/bin/phpunit tests


PHPUnit 9.5.0 by Sebastian Bergmann and contributors.

.                                                                1 / 1 (100%)

Time: 00:00.004, Memory: 4.00 MB

OK (1 tests, 1 assertions)