nexarch/web/mail-postfach/lib/api.test.ts

import { describe, expect, it, vi } from "vitest";
import { fetchMailboxes, fetchMessages, type Fetcher } from "./api";

function fakeFetcher(body: unknown, status = 200): Fetcher {
  return vi.fn().mockResolvedValue(new Response(JSON.stringify(body), { status }));
}

describe("fetchMailboxes", () => {
  it("ruft /mailboxes auf und entpackt die Liste", async () => {
    const fetcher = fakeFetcher({ mailboxes: [{ name: "posteingang", messageCount: 3 }] });
    const result = await fetchMailboxes(fetcher);
    expect(result).toEqual([{ name: "posteingang", messageCount: 3 }]);
    expect(fetcher).toHaveBeenCalledWith(expect.stringContaining("/mailboxes"));
  });

  it("wirft bei Fehlerstatus", async () => {
    const fetcher = fakeFetcher({ error: "nicht angemeldet" }, 401);
    await expect(fetchMailboxes(fetcher)).rejects.toThrow();
  });
});

describe("fetchMessages", () => {
  it("haengt mailbox und q als Query-Parameter an, wenn gesetzt", async () => {
    const fetcher = fakeFetcher({ messages: [] });
    await fetchMessages({ mailbox: "archiv", q: "rechnung" }, fetcher);
    const url = new URL((fetcher as ReturnType<typeof vi.fn>).mock.calls[0][0] as string);
    expect(url.searchParams.get("mailbox")).toBe("archiv");
    expect(url.searchParams.get("q")).toBe("rechnung");
  });

  it("laesst mailbox/q weg, wenn nicht gesetzt", async () => {
    const fetcher = fakeFetcher({ messages: [] });
    await fetchMessages({}, fetcher);
    const url = new URL((fetcher as ReturnType<typeof vi.fn>).mock.calls[0][0] as string);
    expect(url.searchParams.has("mailbox")).toBe(false);
    expect(url.searchParams.has("q")).toBe(false);
  });

  it("entpackt die Nachrichtenliste aus der Antwort", async () => {
    const message = { messageId: "m1", subject: "Betreff", sender: "a@b.test", mailbox: "posteingang", sentAt: 100 };
    const fetcher = fakeFetcher({ messages: [message] });
    expect(await fetchMessages({}, fetcher)).toEqual([message]);
  });
});