Created by Pest Playground

app\Math.php

<?php

namespace App;

class Math
{
    public static function add($a, $b)
    {
        return $a + $b;
    }

    public static function subtract($a, $b)
    {
        return $a - $b;
    }

    public static function multiply($a, $b)
    {
        return $a * $b;
    }

    public static function divide($a, $b)
    {
        return $a / $b;
    }
}

tests\MathTest.php

<?php

use App\Math;

it('can add two numbers', function () {
    expect(Math::add(1, 2))->toBe(3);
});

it('can subtract two numbers', function () {
    expect(Math::subtract(3, 2))->toBe(1);
});

it('can multiply two numbers', function ($a, $b, $result) {
    expect(Math::multiply($a, $b))->toBe($result);
})->with([
    [1, 1, 1],
    [1, 2, 2],
    [2, 3, 6],
]);

it('can divide two numbers');

tests\Pest.php

<?php

/*
|--------------------------------------------------------------------------
| Test Case
|--------------------------------------------------------------------------
|
| The closure you provide to your test functions is always bound to a specific PHPUnit test
| case class. By default, that class is "PHPUnit\Framework\TestCase". Of course, you may
| need to change it using the "uses()" function to bind a different classes or traits.
|
*/

// uses(Tests\TestCase::class)->in('Feature');

/*
|--------------------------------------------------------------------------
| Expectations
|--------------------------------------------------------------------------
|
| When you're writing tests, you often need to check that values meet certain conditions. The
| "expect()" function gives you access to a set of "expectations" methods that you can use
| to assert different things. Of course, you may extend the Expectation API at any time.
|
*/

expect()->extend('toBeOne', function () {
    return $this->toBe(1);
});

/*
|--------------------------------------------------------------------------
| Functions
|--------------------------------------------------------------------------
|
| While Pest is very powerful out-of-the-box, you may have some testing code specific to your
| project that you don't want to repeat in every file. Here you can also expose helpers as
| global functions to help you to reduce the number of lines of code in your test files.
|
*/

function something()
{
    // ..
}