Testing a getter and a setter at the same time in a PHPUnit test

Published on 2022-10-26 • Modified on 2022-10-26

This snippet shows how to test a getter and a setter simultaneously in a PHPUnit test case. This small trick allows us to gain space and test both functions on the same line thanks to the fluent interface of the class. You can use a data provider if you don't want to duplicate the tested value.

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<?php

declare(strict_types=1);

namespace App\Tests\Unit\Entity;

use App\Entity\Article;
use PHPUnit\Framework\TestCase;

final class ArticleTest extends TestCase
{
    public function testArticleIcon(): void
    {
        self::assertNull((new Article())->getIcon()); // initial value, field is nullable
        self::assertSame('icon', (new Article())->setIcon('icon')->getIcon());
    }

    /**
     * @return iterable<array{0: string}>
     */
    public function providerForArticleIconWithProvider(): iterable
    {
        yield ['foo'];
        yield [''];
    }

    /**
     * @dataProvider providerForArticleIconWithProvider
     */
    public function testArticleIconWithProvider(string $value): void
    {
        self::assertSame($value, (new Article())->setIcon($value)->getIcon());
    }
}

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