testing in php

test-php.php

                                                                                                                                                                                      at  08:49:47 ─╮
╰─❯ tree . -I "vendor|composer.lock"                                                                                                                                                                                                       ─╯

.
├── composer.json
└── src
    ├── index.php
    └── MathFunctionsTest.php

1 directory, 3 files

### index.php 

<?php

function add($a, $b) {
    return $a + $b;
}

function sub($a, $b) {
    return $a - $b;
}

### MathFunctionsTest.php

<?php

use PHPUnit\Framework\TestCase;

class MathFunctionsTest extends TestCase {

    public function testAdd() {
        $this->assertEquals(3, add(1, 2));
        $this->assertEquals(0, add(-1, 1));
        $this->assertEquals(-2, add(-1, -1));
    }

    public function testSub() {
        $this->assertEquals(1, sub(2, 1));
        $this->assertEquals(0, sub(-1, -1));
        $this->assertEquals(-2, sub(-1, 1));
    }
}

## composer.json
╰─❯ cat composer.json                                                                                                                                                                                                                      ─╯
{
    "require-dev": {
        "phpunit/phpunit": "^9.5"
    },
    "autoload": {
        "files": ["src/index.php"]
    }
}

### bash 
composer install 
vendor/bin/phpunit src/MathFunctionsTest.php