agentic-dev/packages/blog/src/interface-adapters/controllers/get-article-by-slug.controller.test.ts

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

describe("getArticleBySlugController", () => {
  it("returns 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 controller = getArticleBySlugController(useCase);

    const result = await controller({ slug: "test-slug" });
    expect(result.slug).toBe("test-slug");
  });

  it("throws ArticleNotFoundError for missing slug", async () => {
    const repo = new MockArticlesRepository();
    const useCase = getArticleBySlugUseCase(repo);
    const controller = getArticleBySlugController(useCase);

    await expect(controller({ slug: "nope" })).rejects.toBeInstanceOf(ArticleNotFoundError);
  });

  it("throws InputParseError on empty slug", async () => {
    const repo = new MockArticlesRepository();
    const useCase = getArticleBySlugUseCase(repo);
    const controller = getArticleBySlugController(useCase);

    await expect(
      controller({} as { slug: string }),
    ).rejects.toBeInstanceOf(InputParseError);
  });
});