gerbeur/src/test/pages/UserPublicProfile.test.tsx

import { API_URL } from "../../config/api.ts";
import { describe, expect, test, vi } from "vitest";
import { act, screen, waitFor, within } from "@testing-library/react";
import { userEvent } from "@testing-library/user-event";
import { UserPublicProfile } from "../../pages/UserPublicProfile.tsx";
import type { PublicUser } from "../../../shared/user.ts";
import { calls, fail, route } from "../fetch.ts";
import {
  makeCategory,
  makeDump,
  makePlaylist,
  makeSession,
  makeUser,
  page,
  wire,
} from "../fixtures.ts";
import { currentPath, renderApp } from "../render.tsx";
import { FakeWebSocket } from "../ws.ts";
import { AUTH_STORAGE_KEY } from "../../utils/auth/storage.ts";
import { FakeIntersectionObserver } from "../setup.ts";

const ann = makeUser({
  id: "ann",
  username: "ann",
  description: "I **dump** things",
  invitedByUsername: "root",
});
const annSession = makeSession({
  id: "ann",
  username: "ann",
  email: "ann@x.test",
});

function open(
  {
    session = null as ReturnType<typeof makeSession> | null,
    user = ann as PublicUser,
    url = "/@ann",
    dumps = [makeDump({ id: "d1", title: "Her dump", userId: "ann" })],
    votes = [makeDump({ id: "v1", title: "She liked this" })],
    playlists = [makePlaylist({ id: "p1", title: "Her mix", userId: "ann" })],
    categories = [] as ReturnType<typeof makeCategory>[],
  } = {},
) {
  route("GET /api/users/:u", () => wire(user));
  route("GET /api/users/:u/dumps", () => page(dumps));
  route("GET /api/users/:u/upvoted", () => page(votes));
  route("GET /api/users/:u/playlists", () => page(playlists));
  const u = userEvent.setup();
  renderApp(<UserPublicProfile />, {
    route: url,
    path: "/:handle/*",
    session,
    categories,
  });
  return { user: u, socket: FakeWebSocket.last };
}

describe("UserPublicProfile", () => {
  test("a user from another instance shows their home, and edits nothing here", async () => {
    const alice = makeUser({ id: "al", username: "alice@home.example" });
    open({
      user: alice,
      url: "/@alice@home.example",
      session: makeSession({ id: "al", username: "alice@home.example" }),
    });
    expect(await screen.findByRole("heading", { name: "alice@home.example" }))
      .toBeInTheDocument();
    // Through the API, which redirects to the home's pages.
    expect(screen.getByRole("link", { name: "home.example" })).toHaveAttribute(
      "href",
      `${API_URL}/api/users/@alice%40home.example/home`,
    );
    expect(screen.queryByTitle("Change avatar")).not.toBeInTheDocument();
    expect(screen.queryByTitle("Edit email")).not.toBeInTheDocument();
    expect(screen.queryByText("O.G.")).not.toBeInTheDocument();
    expect(calls("GET /api/users/:u")[0].path).toBe(
      "/api/users/@alice%40home.example",
    );
  });

  test("header, description, and the overview", async () => {
    open();
    expect(await screen.findByRole("heading", { name: "ann" }))
      .toBeInTheDocument();
    expect(screen.getByRole("link", { name: "@root" })).toHaveAttribute(
      "href",
      "/@root",
    );
    expect(screen.getByText("dump").tagName).toBe("STRONG");
    expect(await screen.findByText("Her dump")).toBeInTheDocument();
    expect(await screen.findByText("She liked this")).toBeInTheDocument();
    expect(screen.getByRole("heading", { name: "Dumps (1)" }))
      .toBeInTheDocument();
    const [dumpsAll, votesAll] = screen.getAllByRole("link", {
      name: "View all →",
    });
    expect(dumpsAll).toHaveAttribute("href", "/@ann/dumps");
    expect(votesAll).toHaveAttribute("href", "/@ann/upvoted");
    await waitFor(() => expect(document.title).toMatch(/^ann · /));
    // The lists are read by the user's id, which a rename doesn't change.
    expect(calls("GET /api/users/:u/dumps")[0].path).toBe(
      "/api/users/ann/dumps",
    );
    expect(calls("GET /api/users/:u")[0].path).toBe("/api/users/@ann");
  });

  test("an unknown user", async () => {
    route("GET /api/users/:u", () => fail("User not found", 404));
    renderApp(<UserPublicProfile />, {
      route: "/@nobody",
      path: "/:handle/*",
    });
    expect(await screen.findByRole("alert")).toHaveTextContent(
      "User not found",
    );
  });

  test("a role chip for moderators, and none for users", async () => {
    open({ user: { ...ann, role: "moderator" } });
    expect(await screen.findByText("Moderator")).toBeInTheDocument();
  });

  test("tabs are plain segments, the overview the bare path", async () => {
    const { user } = open();
    await screen.findByRole("heading", { name: "ann" });
    const tabs = document.querySelector(".profile-tabs") as HTMLElement;
    await user.click(within(tabs).getByRole("button", { name: "Playlists" }));
    expect(currentPath()).toBe("/@ann/playlists");
    expect(await screen.findByText("Her mix")).toBeInTheDocument();
    await user.click(within(tabs).getByRole("button", { name: "Overview" }));
    expect(currentPath()).toBe("/@ann");
  });

  test("a tab or view the profile hasn't is not found", async () => {
    for (const url of ["/@ann/nope", "/@ann/follow/users", "/@ann/dumps/x"]) {
      const { unmount } = renderApp(<UserPublicProfile />, {
        route: url,
        path: "/:handle/*",
      });
      expect(await screen.findByText("This page does not exist."))
        .toBeInTheDocument();
      unmount();
    }
  });

  test("a former name or another case: the URL takes the current one", async () => {
    open({ url: "/@ANN_OLD/playlists?x=1" });
    await screen.findByRole("heading", { name: "ann" });
    await waitFor(() => expect(currentPath()).toBe("/@ann/playlists?x=1"));
    expect(await screen.findByText("Her mix")).toBeInTheDocument();
    // The URL's change names the user on screen, who isn't fetched again.
    expect(calls("GET /api/users/:u")).toHaveLength(1);
  });

  test("the dumps tab lists them all; a visitor loses one gone private, and gets it back", async () => {
    const list = ["x", "y", "z"].map((id) =>
      makeDump({ id, title: `T-${id}`, userId: "ann" })
    );
    const { socket } = open({ url: "/@ann/dumps", dumps: list });
    await screen.findByText("T-z");
    expect(screen.getByRole("heading", { name: "Dumps" })).toBeInTheDocument();
    expect(screen.queryByRole("button", { name: /New dump/ })).not
      .toBeInTheDocument();
    socket.welcome();
    socket.receive({
      type: "dump_updated",
      dump: wire({ ...list[1], isPrivate: true }),
    });
    expect(screen.queryByText("T-y")).not.toBeInTheDocument();
    socket.receive({
      type: "dump_updated",
      dump: wire({ ...list[1], isPrivate: false }),
    });
    const titles = Array.from(document.querySelectorAll(".dump-card-title"))
      .map((a) => a.textContent);
    expect(titles).toEqual(["T-x", "T-y", "T-z"]);
  });

  test("the dumps tab gains her new dumps live, and reads its pages again on a reconnect", async () => {
    const old = makeDump({
      id: "o",
      title: "Older",
      userId: "ann",
      createdAt: new Date(Date.now() - 60_000),
    });
    const { socket } = open({ url: "/@ann/dumps", dumps: [old] });
    await screen.findByText("Older");
    socket.welcome();
    socket.receive({
      type: "dump_created",
      dump: wire(makeDump({ id: "n", title: "Fresh", userId: "ann" })),
    });
    // Someone else's goes to their own profile.
    socket.receive({
      type: "dump_created",
      dump: wire(makeDump({ id: "x", title: "Not hers", userId: "bob" })),
    });
    const titles = () =>
      Array.from(document.querySelectorAll(".dump-card-title"))
        .map((a) => a.textContent);
    expect(titles()).toEqual(["Fresh", "Older"]);

    // Deleted while the socket was down.
    route("GET /api/users/:u/dumps", () => page([old]));
    socket.drop();
    await act(() => new Promise((r) => setTimeout(r, 600)));
    FakeWebSocket.last.welcome();
    await waitFor(() => expect(titles()).toEqual(["Older"]));
  });

  test("the dumps tab narrows to a category, in its URL, and drops a dump edited out of it; only the dump lists keep it", async () => {
    const music = makeCategory({ id: "c1", slug: "music", name: "Music" });
    const tagged = makeDump({
      id: "m",
      title: "Tagged",
      userId: "ann",
      categoryIds: ["c1"],
    });
    const { user, socket } = open({ url: "/@ann/dumps", categories: [music] });
    route("GET /api/users/:u/dumps", (req) =>
      page(
        req.url.searchParams.get("category") === "music"
          ? [tagged]
          : [tagged, makeDump({ id: "o", title: "Other", userId: "ann" })],
      ));
    await screen.findByText("Other");
    await user.click(screen.getByRole("button", { name: "All" }));
    await user.click(screen.getByRole("option", { name: "Music" }));
    expect(currentPath()).toBe("/@ann/dumps?category=music");
    await waitFor(() =>
      expect(screen.queryByText("Other")).not.toBeInTheDocument()
    );
    expect(screen.getByText("Tagged")).toBeInTheDocument();
    socket.welcome();
    socket.receive({
      type: "dump_updated",
      dump: wire({ ...tagged, categoryIds: [] }),
    });
    expect(screen.queryByText("Tagged")).not.toBeInTheDocument();
    // Switching to the upvoted list keeps the category.
    await user.click(screen.getByRole("button", { name: "Upvoted" }));
    expect(currentPath()).toBe("/@ann/upvoted?category=music");
    await waitFor(() =>
      expect(calls("GET /api/users/:u/upvoted").at(-1)!.url.searchParams.get(
        "category",
      )).toBe("music")
    );
    // Any other tab drops it.
    await user.click(screen.getByRole("button", { name: "Playlists" }));
    expect(currentPath()).toBe("/@ann/playlists");
  });

  test("the playlists tab narrows to a playlist category, in its URL", async () => {
    const music = makeCategory({ id: "c1", slug: "music", name: "Music" });
    const mixes = makeCategory({
      id: "pc1",
      kind: "playlist",
      slug: "mixes",
      name: "Mixes",
    });
    const filed = makePlaylist({
      id: "p1",
      title: "Filed mix",
      userId: "ann",
      categoryIds: ["pc1"],
    });
    const { user, socket } = open({
      url: "/@ann/playlists",
      categories: [music, mixes],
    });
    route("GET /api/users/:u/playlists", (req) =>
      page(
        req.url.searchParams.get("category") === "mixes"
          ? [filed]
          : [filed, makePlaylist({ id: "p2", title: "Loose", userId: "ann" })],
      ));
    await screen.findByText("Loose");
    await user.click(screen.getByRole("button", { name: "All" }));
    expect(screen.queryByRole("option", { name: "Music" })).toBeNull();
    await user.click(screen.getByRole("option", { name: "Mixes" }));
    expect(currentPath()).toBe("/@ann/playlists?category=mixes");
    await waitFor(() =>
      expect(screen.queryByText("Loose")).not.toBeInTheDocument()
    );
    expect(screen.getByText("Filed mix")).toBeInTheDocument();
    socket.welcome();
    socket.receive({
      type: "playlist_updated",
      playlist: wire({ ...filed, categoryIds: [] }),
    });
    expect(screen.queryByText("Filed mix")).not.toBeInTheDocument();
  });

  test("the playlists tab's order is in its URL, beside the category, and no other tab's", async () => {
    const mixes = makeCategory({
      id: "pc1",
      kind: "playlist",
      slug: "mixes",
      name: "Mixes",
    });
    const { user } = open({ url: "/@ann/playlists", categories: [mixes] });
    route(
      "GET /api/users/:u/playlists",
      () => page([makePlaylist({ title: "Mix", userId: "ann" })]),
    );
    const asked = () =>
      calls("GET /api/users/:u/playlists").at(-1)!.url.searchParams;
    await screen.findByText("Mix");
    expect(asked().get("sort")).toBeNull();

    await user.click(screen.getByRole("button", { name: "New" }));
    expect(currentPath()).toBe("/@ann/playlists?sort=new");
    await waitFor(() => expect(asked().get("sort")).toBe("new"));
    await user.click(screen.getByRole("button", { name: "All" }));
    await user.click(screen.getByRole("option", { name: "Mixes" }));
    expect(currentPath()).toBe("/@ann/playlists?sort=new&category=mixes");
    await waitFor(() => expect(asked().get("category")).toBe("mixes"));
    expect(asked().get("sort")).toBe("new");
    // The default order is the bare tab's.
    await user.click(screen.getByRole("button", { name: "Updated" }));
    expect(currentPath()).toBe("/@ann/playlists?category=mixes");

    // Neither the order nor a playlist category means anything to the dumps.
    await user.click(screen.getByRole("button", { name: "Most dumps" }));
    expect(currentPath()).toBe("/@ann/playlists?category=mixes&sort=dumps");
    await user.click(screen.getByRole("button", { name: "Dumps" }));
    expect(currentPath()).toBe("/@ann/dumps");
  });

  test("the dumps tab loads more as its end scrolls into view", async () => {
    open({ url: "/@ann/dumps" });
    // After open's, so that it wins.
    route(
      "GET /api/users/:u/dumps",
      (req) =>
        req.url.searchParams.get("page") === "1"
          ? page([makeDump({ title: "First", userId: "ann" })], true)
          : page([makeDump({ title: "Second", userId: "ann" })]),
    );
    await screen.findByText("First");
    act(() => FakeIntersectionObserver.instances.at(-1)!.report(true));
    expect(await screen.findByText("Second")).toBeInTheDocument();
    expect(screen.getByText("You've reached the end.")).toBeInTheDocument();
  });

  test("the upvoted tab follows their votes", async () => {
    route(
      "GET /api/dumps/:id",
      () => wire(makeDump({ id: "v3", title: "Fresh like" })),
    );
    const { socket } = open({ url: "/@ann/upvoted" });
    await screen.findByText("She liked this");
    expect(screen.getByRole("heading", { name: "Upvoted" }))
      .toBeInTheDocument();
    socket.welcome();
    socket.receive({
      type: "votes_update",
      dumpId: "v3",
      voteCount: 1,
      voterId: "ann",
      action: "cast",
    });
    await waitFor(() =>
      expect(document.querySelector(".dump-card-title")).toHaveTextContent(
        "Fresh like",
      )
    );
  });

  test("the playlists tab holds hers only, kept live", async () => {
    const { socket } = open({ url: "/@ann/playlists" });
    await screen.findByText("Her mix");
    expect(calls("GET /api/users/:u/follow/playlists")).toHaveLength(0);
    expect(screen.queryByRole("button", { name: "Delete playlist" })).not
      .toBeInTheDocument();
    socket.welcome();
    socket.receive({
      type: "playlist_created",
      playlist: wire(
        makePlaylist({ id: "p2", title: "Brand new mix", userId: "ann" }),
      ),
    });
    expect(screen.getByText("Brand new mix")).toBeInTheDocument();
    socket.receive({
      type: "playlist_updated",
      playlist: wire(
        makePlaylist({
          id: "p1",
          title: "Her mix",
          userId: "ann",
          isPublic: false,
        }),
      ),
    });
    expect(screen.queryByText("Her mix")).not.toBeInTheDocument();
  });

  test("follow: users at the bare tab, playlists one segment further", async () => {
    route(
      "GET /api/users/:u/follow/users",
      () => page([makeUser({ username: "bob" })]),
    );
    route(
      "GET /api/users/:u/follow/playlists",
      () => page([makePlaylist({ title: "Their mix" })]),
    );
    const { user } = open({ url: "/@ann/follow" });
    expect(await screen.findByRole("link", { name: /@bob/ })).toHaveAttribute(
      "href",
      "/@bob",
    );
    expect(calls("GET /api/users/:u/follow/playlists")).toHaveLength(0);
    const views = document.querySelector(".followed-sub-nav") as HTMLElement;
    await user.click(within(views).getByRole("button", { name: "Playlists" }));
    expect(currentPath()).toBe("/@ann/follow/playlists");
    expect(await screen.findByText("Their mix")).toBeInTheDocument();
    await user.click(within(views).getByRole("button", { name: "Users" }));
    expect(currentPath()).toBe("/@ann/follow");
  });

  test("follow: more users as the list's end scrolls into view", async () => {
    route(
      "GET /api/users/:u/follow/users",
      (req) =>
        req.url.searchParams.get("page") === "1"
          ? page([makeUser({ username: "bob" })], true)
          : page([makeUser({ username: "cy" })]),
    );
    open({ url: "/@ann/follow" });
    await screen.findByRole("link", { name: /@bob/ });
    act(() => FakeIntersectionObserver.instances.at(-1)!.report(true));
    expect(await screen.findByRole("link", { name: /@cy/ }))
      .toBeInTheDocument();
  });

  test("invitees as a tree", async () => {
    route("GET /api/users/:u/invitees", () =>
      wire([
        { id: "b", username: "bob", invitedById: "ann", createdAt: new Date() },
        { id: "c", username: "cy", invitedById: "b", createdAt: new Date() },
      ]));
    open({ url: "/@ann/invitees" });
    const bob = (await screen.findByRole("link", { name: /@bob/ })).closest(
      "li",
    )!;
    expect(within(bob).getByRole("link", { name: /@cy/ })).toBeInTheDocument();
  });

  test("visitors can follow; inviting is only on your own profile", async () => {
    open({ session: makeSession({ id: "bob" }) });
    expect(await screen.findByRole("button", { name: "Follow ann" }))
      .toBeInTheDocument();
    expect(screen.queryByRole("button", { name: "+ Invite someone" })).not
      .toBeInTheDocument();
  });

  describe("your own profile", () => {
    test("edit the description; clearing it really clears it", async () => {
      route(
        "PATCH /api/me",
        (req) => wire({ ...ann, ...(req.body as object) }),
      );
      const { user } = open({ session: annSession });
      const view = (await screen.findByText("dump")).closest(
        "[title='Edit description']",
      ) as HTMLElement;
      view.focus();
      await user.keyboard("{Enter}");
      const box = screen.getByPlaceholderText("Who am I?");
      await user.clear(box);
      await user.click(screen.getByRole("button", { name: "Save" }));
      expect(await screen.findByText("Who am I?")).toBeInTheDocument();
      expect(calls("PATCH /api/me")[0].body).toEqual({ description: "" });
    });

    test("edit the email", async () => {
      route(
        "PATCH /api/me",
        (req) => wire({ ...ann, ...(req.body as object) }),
      );
      const { user } = open({ session: annSession });
      await user.click(
        await screen.findByRole("button", { name: /ann@x\.test/ }),
      );
      const input = screen.getByDisplayValue("ann@x.test");
      await user.clear(input);
      await user.type(input, "new@x.test{Enter}");
      expect(await screen.findByRole("button", { name: /new@x\.test/ }))
        .toBeInTheDocument();
      expect(JSON.parse(localStorage.getItem(AUTH_STORAGE_KEY)!).user.email)
        .toBe("new@x.test");
    });

    test("a refused email says why", async () => {
      route("PATCH /api/me", () => fail("Email already in use", 409));
      const { user } = open({ session: annSession });
      await user.click(
        await screen.findByRole("button", { name: /ann@x\.test/ }),
      );
      await user.type(screen.getByDisplayValue("ann@x.test"), "x{Enter}");
      expect(await screen.findByRole("alert")).toHaveTextContent(
        "Email already in use",
      );
    });

    test("upload an avatar", async () => {
      route(
        "PUT /api/me/avatar",
        () =>
          wire({ ...ann, avatarMime: "image/png", updatedAt: new Date(7000) }),
      );
      const { user } = open({ session: annSession });
      await screen.findByRole("heading", { name: "ann" });
      const input = document.querySelector<HTMLInputElement>(
        ".avatar-change-overlay input",
      )!;
      await user.upload(
        input,
        new File([new Uint8Array(3)], "me.png", { type: "image/png" }),
      );
      await waitFor(() =>
        expect(document.querySelector(".profile-avatar-wrapper img"))
          .toHaveAttribute(
            "src",
            "http://localhost:8000/api/users/ann/avatar?v=7000",
          )
      );
    });

    test("a rejected avatar says why", async () => {
      route("PUT /api/me/avatar", () => fail("Not an image", 400));
      const { user } = open({ session: annSession });
      await screen.findByRole("heading", { name: "ann" });
      const input = document.querySelector<HTMLInputElement>(
        ".avatar-change-overlay input",
      )!;
      await user.upload(
        input,
        new File([new Uint8Array(3)], "me.png", { type: "image/png" }),
      );
      expect(await screen.findByRole("alert")).toHaveTextContent(
        "Not an image",
      );
    });

    test("invite someone: a link to copy", async () => {
      route("POST /api/invites", () => ({ token: "tok123" }));
      const { user } = open({ session: annSession });
      await user.click(
        await screen.findByRole("button", { name: "+ Invite someone" }),
      );
      const link = await screen.findByRole("textbox", { name: "Invite link" });
      expect(link).toHaveValue(`${location.origin}/register?token=tok123`);
      await user.click(screen.getByRole("button", { name: "Copy" }));
      // user-event stands in for the clipboard.
      expect(await navigator.clipboard.readText()).toBe(
        `${location.origin}/register?token=tok123`,
      );
      expect(screen.getByRole("button", { name: "Copied!" }))
        .toBeInTheDocument();
    });

    test("your upvotes show before the live connection welcomes you", async () => {
      open({ session: annSession });
      // No welcome is sent.
      expect(await screen.findByText("She liked this")).toBeInTheDocument();
    });

    test("unvoting fades it out of your upvoted column", async () => {
      vi.useFakeTimers({ shouldAdvanceTime: true });
      try {
        const { socket } = open({ session: annSession });
        await screen.findByText("She liked this");
        socket.welcome({ myVotes: ["v1"] });
        socket.receive({
          type: "vote_ack",
          dumpId: "v1",
          action: "remove",
          voteCount: 0,
        });
        expect(screen.getByText("She liked this").closest(".dump-card"))
          .toHaveClass("dump-card--fading");
      } finally {
        vi.useRealTimers();
      }
    });

    test("an admin's own profile has no manage tab: that's for others'", async () => {
      open({
        session: { ...annSession, user: { ...annSession.user, role: "admin" } },
        user: { ...ann, role: "admin" },
      });
      expect(await screen.findByRole("button", { name: "+ Invite someone" }))
        .toBeInTheDocument();
      expect(
        within(document.querySelector(".profile-tabs") as HTMLElement)
          .queryByRole("button", { name: "Manage" }),
      ).not.toBeInTheDocument();
    });
  });

  describe("manage", () => {
    test("an admin can change someone's role", async () => {
      route(
        "PATCH /api/users/:id/role",
        (req) => wire({ ...ann, role: (req.body as { role: string }).role }),
      );
      const { user } = open({
        session: makeSession({ id: "admin", role: "admin" }),
        url: "/@ann/manage",
      });
      await user.click(
        await screen.findByRole("button", { name: "Moderator" }),
      );
      await waitFor(() =>
        expect(screen.getByRole("button", { name: "Moderator" })).toHaveClass(
          "active",
        )
      );
      expect(calls("PATCH /api/users/:id/role")[0].path).toBe(
        "/api/users/ann/role",
      );
      expect(document.querySelector(".profile-role-chip")).toHaveTextContent(
        "Moderator",
      );
    });

    test("a refused role change says why", async () => {
      route(
        "PATCH /api/users/:id/role",
        () => fail("Cannot demote the last admin", 400),
      );
      const { user } = open({
        session: makeSession({ id: "admin", role: "admin" }),
        url: "/@ann/manage",
      });
      await user.click(await screen.findByRole("button", { name: "Admin" }));
      expect(await screen.findByRole("alert")).toHaveTextContent(
        "Cannot demote the last admin",
      );
    });

    test("an admin renames someone, and the URL follows", async () => {
      route(
        "PATCH /api/users/:id/username",
        (req) =>
          wire({
            ...ann,
            username: (req.body as { username: string }).username,
          }),
      );
      const { user } = open({
        session: makeSession({ id: "admin", role: "admin" }),
        url: "/@ann/manage",
      });
      const name = await screen.findByRole("textbox", { name: "Username" });
      await user.clear(name);
      await user.type(name, "annie{Enter}");
      await waitFor(() => expect(currentPath()).toBe("/@annie/manage"));
      expect(screen.getByRole("heading", { name: "annie" }))
        .toBeInTheDocument();
      expect(calls("PATCH /api/users/:id/username")[0]).toMatchObject({
        path: "/api/users/ann/username",
        body: { username: "annie" },
      });
    });

    test("a refused rename says why, and a malformed one isn't sent", async () => {
      route(
        "PATCH /api/users/:id/username",
        () => fail("Username already exists", 409),
      );
      const { user } = open({
        session: makeSession({ id: "admin", role: "admin" }),
        url: "/@ann/manage",
      });
      const name = await screen.findByRole("textbox", { name: "Username" });
      await user.type(name, " x{Enter}");
      expect(await screen.findByText(/Letters, numbers and underscores/))
        .toBeInTheDocument();
      expect(calls("PATCH /api/users/:id/username")).toHaveLength(0);
      await user.clear(name);
      await user.type(name, "annx{Enter}");
      expect(await screen.findByRole("alert")).toHaveTextContent(
        "Username already exists",
      );
    });

    test("a user from another instance is named there, not here", async () => {
      open({
        session: makeSession({ id: "admin", role: "admin" }),
        user: { ...ann, username: "ann@home.example" },
        url: "/@ann@home.example/manage",
      });
      expect(
        await screen.findByText("ann@home.example", {
          selector: ".profile-appearance-value",
        }),
      ).toBeInTheDocument();
      expect(screen.queryByRole("textbox", { name: "Username" })).toBeNull();
    });

    test("non-admins get no manage tab, nor its page", async () => {
      open({
        session: makeSession({ id: "mod", role: "moderator" }),
        url: "/@ann/manage",
      });
      expect(await screen.findByText("This page does not exist."))
        .toBeInTheDocument();
    });
  });
});