feat: GetChapters endpoint + tests

tests/Domain/Manga/Adapter/InMemoryMangaRepository.php

@@ -3,12 +3,17 @@
 namespace App\Tests\Domain\Manga\Adapter;
 
 use App\Domain\Manga\Domain\Contract\Repository\MangaRepositoryInterface;
+use App\Domain\Manga\Domain\Model\Chapter;
 use App\Domain\Manga\Domain\Model\Manga;
+use App\Domain\Manga\Domain\Model\ValueObject\ChapterId;
 
 class InMemoryMangaRepository implements MangaRepositoryInterface
 {
     /** @var Manga[] */
     private array $mangas = [];
+    
+    /** @var array<string, Chapter[]> */
+    private array $chapters = [];
 
     public function findAll(int $page = 1, int $limit = 20, string $sortBy = 'title', string $sortOrder = 'asc'): array
     {
@@ -66,8 +71,49 @@ class InMemoryMangaRepository implements MangaRepositoryInterface
         };
     }
 
+    public function findChapters(string $mangaId, int $page = 1, int $limit = 20, string $sortOrder = 'desc'): array
+    {
+        if (!isset($this->chapters[$mangaId])) {
+            return [];
+        }
+
+        $chapters = $this->chapters[$mangaId];
+
+        usort($chapters, function (Chapter $a, Chapter $b) use ($sortOrder) {
+            return $sortOrder === 'desc'
+                ? $b->getNumber() <=> $a->getNumber()
+                : $a->getNumber() <=> $b->getNumber();
+        });
+
+        $offset = ($page - 1) * $limit;
+        return array_slice($chapters, $offset, $limit);
+    }
+
+    public function countChapters(string $mangaId): int
+    {
+        return isset($this->chapters[$mangaId]) ? count($this->chapters[$mangaId]) : 0;
+    }
+
+    public function addChaptersToManga(string $mangaId, int $count): void
+    {
+        $this->chapters[$mangaId] = [];
+        
+        for ($i = 1; $i <= $count; $i++) {
+            $this->chapters[$mangaId][] = new Chapter(
+                id: new ChapterId((string)$i),
+                mangaId: $mangaId,
+                number: (float)$i,
+                title: "Chapter $i",
+                volume: (int)ceil($i / 10),
+                isVisible: true,
+                createdAt: new \DateTimeImmutable()
+            );
+        }
+    }
+
     public function clear(): void
     {
         $this->mangas = [];
+        $this->chapters = [];
     }
 } 

tests/Domain/Manga/Application/QueryHandler/GetMangaChaptersHandlerTest.php

@@ -0,0 +1,104 @@
+<?php
+
+namespace App\Tests\Domain\Manga\Application\QueryHandler;
+
+use App\Domain\Manga\Application\Query\GetMangaChapters;
+use App\Domain\Manga\Application\QueryHandler\GetMangaChaptersHandler;
+use App\Domain\Manga\Domain\Exception\MangaNotFoundException;
+use App\Domain\Manga\Domain\Model\Manga;
+use App\Domain\Manga\Domain\Model\ValueObject\MangaId;
+use App\Domain\Manga\Domain\Model\ValueObject\MangaSlug;
+use App\Domain\Manga\Domain\Model\ValueObject\MangaTitle;
+use App\Tests\Domain\Manga\Adapter\InMemoryMangaRepository;
+use PHPUnit\Framework\TestCase;
+
+class GetMangaChaptersHandlerTest extends TestCase
+{
+    private InMemoryMangaRepository $repository;
+    private GetMangaChaptersHandler $handler;
+
+    protected function setUp(): void
+    {
+        $this->repository = new InMemoryMangaRepository();
+        $this->handler = new GetMangaChaptersHandler($this->repository);
+    }
+
+    public function testHandleThrowsExceptionWhenMangaNotFound(): void
+    {
+        $this->expectException(MangaNotFoundException::class);
+        
+        $query = new GetMangaChapters('non-existent-id');
+        $this->handler->handle($query);
+    }
+
+    public function testHandleReturnsEmptyListWhenNoChapters(): void
+    {
+        // Arrange
+        $this->givenMangaExists('123');
+        
+        // Act
+        $query = new GetMangaChapters('123');
+        $response = $this->handler->handle($query);
+        
+        // Assert
+        $this->assertEmpty($response->chapters);
+        $this->assertEquals(0, $response->total);
+        $this->assertEquals(1, $response->page);
+        $this->assertEquals(20, $response->limit);
+        $this->assertFalse($response->hasNextPage());
+        $this->assertFalse($response->hasPreviousPage());
+    }
+
+    public function testHandleReturnsPaginatedChapters(): void
+    {
+        // Arrange
+        $this->givenMangaExistsWithChapters('123', 25);
+        
+        // Act
+        $query = new GetMangaChapters('123', page: 2, limit: 10);
+        $response = $this->handler->handle($query);
+        
+        // Assert
+        $this->assertCount(10, $response->chapters);
+        $this->assertEquals(25, $response->total);
+        $this->assertEquals(2, $response->page);
+        $this->assertEquals(10, $response->limit);
+        $this->assertTrue($response->hasNextPage());
+        $this->assertTrue($response->hasPreviousPage());
+    }
+
+    protected function tearDown(): void
+    {
+        $this->repository->clear();
+    }
+
+    private function givenMangaExists(string $id): void
+    {
+        $manga = $this->createManga($id);
+        $this->repository->save($manga);
+    }
+
+    private function givenMangaExistsWithChapters(string $id, int $chapterCount): void
+    {
+        $this->givenMangaExists($id);
+        // Note: We'll need to implement this in InMemoryMangaRepository
+        $this->repository->addChaptersToManga($id, $chapterCount);
+    }
+
+    private function createManga(string $id): Manga
+    {
+        return new Manga(
+            id: new MangaId($id),
+            title: new MangaTitle('Test Manga'),
+            slug: new MangaSlug('test-manga'),
+            description: 'This is a test manga',
+            author: 'Test Author',
+            publicationYear: 2024,
+            genres: ['Action', 'Adventure'],
+            status: 'Ongoing',
+            externalId: null,
+            imageUrl: null,
+            rating: null
+        );
+    }
+}