PHPUnit

1234567891011121314151617181920212223242526272829303132<?php
use PHPUnit\Framework\TestCase;
use PHPUnit\Framework\Attributes\{Test, DataProvider};

final class SlugifyTest extends TestCase
{
    private Slugifier $sut;

    protected function setUp(): void
    {
        $this->sut = new Slugifier();   // fresh per test
    }

    #[Test]
    public function it_handles_empty_input(): void
    {
        self::assertSame('', $this->sut->slugify(''));
    }

    #[Test]
    #[DataProvider('cases')]
    public function it_slugifies(string $input, string $expected): void
    {
        self::assertSame($expected, $this->sut->slugify($input));
    }

    public static function cases(): iterable
    {
        yield 'spaces'      => ['Hello World', 'hello-world'];
        yield 'punctuation' => ['C++ & Go!', 'c-go'];
    }
}

12345678910111213141516171819202122<?php
#[Test]
public function it_returns_the_title(): void
{
    $repo = $this->createMock(BookRepository::class);
    $repo->expects(self::once())
         ->method('find')
         ->with(42)
         ->willReturn(new Book('Dune'));

    $service = new BookService($repo);
    self::assertSame('Dune', $service->title(42));
}

#[Test]
public function it_rejects_a_missing_book(): void
{
    $this->expectException(NotFoundException::class);
    $this->expectExceptionMessage('Book 99 not found');

    (new BookService($this->createStub(BookRepository::class)))->title(99);
}