PHPUnit example test

AmountTest.php

<?php

declare(strict_types=1);

namespace App\Tests\Catalog\Value;

use App\Catalog\Value\Amount;
use PHPUnit\Framework\TestCase;

final class AmountTest extends TestCase
{
    protected function setUp(): void
    {
        // ...
    }

    public function testGetCents_WithValidCents_ReturnsUnchangedCents(): void
    {
        $amount = new Amount(1000);
        $cents = $amount->getCents();
        self::assertEquals(1000, $cents);
    }

    /**
     * @test
     * @dataProvider getInvalidMarkupValues
     * @param $cents
     */
    public function constructor_WithInvalidCents_ThrowsException($cents): void
    {
        $this->expectException(\Exception::class);
        new Amount(-1);
    }

    public function getInvalidMarkupValues(): array
    {
        return [
            'int' => [0],
            'sring' => ['0.25'],
            'boolean' => [true],
            'array' => [[]],
            'null' => [null],
            'object' => [new \stdClass()],
        ];
    }
}