SuperSeller3000/tests/Unit/Domain/Article/ArticleTest.php

<?php

declare(strict_types=1);

namespace App\Tests\Unit\Domain\Article;

use App\Domain\Article\Article;
use App\Domain\Article\ArticleCondition;
use App\Domain\Article\ArticleStatus;
use App\Domain\Article\ArticleType;
use PHPUnit\Framework\TestCase;

final class ArticleTest extends TestCase
{
    private ArticleType $type;

    protected function setUp(): void
    {
        $this->type = new ArticleType('Notebook');
    }

    public function test_new_article_has_ingesting_status(): void
    {
        $article = new Article($this->type, 'NB-001', 'INV-001', 1, ArticleCondition::Good);

        $this->assertSame(ArticleStatus::Ingesting, $article->getStatus());
        $this->assertSame(1, $article->getStock());
    }

    public function test_valid_status_transition(): void
    {
        $article = new Article($this->type, 'NB-001', 'INV-001', 1, ArticleCondition::Good);
        $article->transitionTo(ArticleStatus::Draft);

        $this->assertSame(ArticleStatus::Draft, $article->getStatus());
    }

    public function test_invalid_status_transition_throws(): void
    {
        $article = new Article($this->type, 'NB-001', 'INV-001', 1, ArticleCondition::Good);

        $this->expectException(\DomainException::class);
        $article->transitionTo(ArticleStatus::Sold);
    }

    public function test_decrement_stock(): void
    {
        $article = new Article($this->type, 'NB-001', 'INV-001', 3, ArticleCondition::Good);
        $article->decrementStock();

        $this->assertSame(2, $article->getStock());
        $this->assertFalse($article->isOutOfStock());
    }

    public function test_decrement_to_zero_marks_out_of_stock(): void
    {
        $article = new Article($this->type, 'NB-001', 'INV-001', 1, ArticleCondition::Good);
        $article->decrementStock();

        $this->assertTrue($article->isOutOfStock());
    }

    public function test_decrement_below_zero_throws(): void
    {
        $article = new Article($this->type, 'NB-001', 'INV-001', 0, ArticleCondition::Good);

        $this->expectException(\DomainException::class);
        $article->decrementStock();
    }
}