import { describe, it, expect } from "vitest";
import { getArticleBySlugUseCase } from "@/application/use-cases/get-article-by-slug.use-case";
import { MockArticlesRepository } from "@/infrastructure/repositories/articles.repository.mock";
import { ArticleNotFoundError } from "@/entities/errors/article";
import { articleFactory } from "@/__factories__/article.factory";

describe("getArticleBySlugUseCase", () => {
  it("returns the article when slug exists", async () => {
    const repo = new MockArticlesRepository();
    const seed = articleFactory.build({ slug: "test-slug" });
    await repo.createArticle(seed);

    const useCase = getArticleBySlugUseCase(repo);
    const result = await useCase({ slug: "test-slug" });

    expect(result?.slug).toBe("test-slug");
  });

  it("throws ArticleNotFoundError when slug is missing", async () => {
    const repo = new MockArticlesRepository();
    const useCase = getArticleBySlugUseCase(repo);
    await expect(useCase({ slug: "does-not-exist" })).rejects.toThrow(ArticleNotFoundError);
  });
});