v4: /follow/playlists opens the followed playlists' feed, and a page's test opens it through the app's routes — the path was a 404 since the two views of the followed feed became pages: the route table held each feed tab as an exact path, /follow, so /follow/playlists fell to /:handle/*, which read "follow" as a category and "playlists" as a tab it hasn't. /music/follow/playlists, which goes through that route, worked. The tabs' routes now take what follows them (/${tab}/*), which Feed already reads and refuses when it names no view.

No test saw it because each page's test mounted the page on a route pattern of its own, a copy of App's, with stand-in pages where a redirect lands: Index's parsed the path itself, and passed on one the app doesn't serve. renderPage (src/test/render.tsx) now opens a URL through AppRoutes, which App.tsx exports for it, inside the real providers, and every page's test uses it: the page is the one the app routes that URL to, behind its guard, and a redirect is checked by the path it lands on. An entry may be a location, to arrive with the state a link hands over. Every page being loaded with its route, the first query after opening one waits. src/test/App.test.tsx tests the table itself: the paths that are a feed, those that are not found, those that send a guest to sign in and back, and those that send a signed-in user home.

The profile's test held /@ann/dumps/x to be a path the profile answers as not found, which only its own pattern made true: in the app it is a dump's page. It now asks for /@ann/dumps/x/y. The tests of the two guards still mount them around a stand-in child, being tests of the guard alone.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/test/App.test.tsx

@@ -0,0 +1,74 @@
+import { describe, expect, test } from "vitest";
+import { screen, waitFor } from "@testing-library/react";
+import { route } from "./fetch.ts";
+import { makeCategory, makeSession, page } from "./fixtures.ts";
+import { currentPath, renderPage } from "./render.tsx";
+
+const music = makeCategory({ id: "c-music", slug: "music", name: "Music" });
+const next = (path: string) => `/login?next=${encodeURIComponent(path)}`;
+
+function open(url: string, session: ReturnType<typeof makeSession> | null) {
+  route("GET /api/dumps", () => page([]));
+  renderPage(url, { session, categories: [music] });
+}
+
+describe("App's routes", () => {
+  test.each([
+    "/",
+    "/hot",
+    "/new",
+    "/journal",
+    "/follow",
+    "/follow/playlists",
+    "/music",
+    "/music/new",
+    "/music/follow",
+    "/music/follow/playlists",
+  ])("%s is a feed", async (url) => {
+    open(url, makeSession());
+    // The tab bar, which the feed draws at two widths.
+    expect(await screen.findAllByRole("button", { name: "Followed" })).not
+      .toHaveLength(0);
+    expect(currentPath()).toBe(url);
+    expect(screen.queryByRole("heading", { name: "404" })).toBeNull();
+  });
+
+  test.each([
+    "/hot/more",
+    "/follow/users",
+    "/follow/nope",
+    "/follow/playlists/more",
+    "/nope",
+    "/music/nope",
+    "/music/hot/more",
+    "/music/follow/users",
+    "/search/users/more",
+  ])("%s is not found", async (url) => {
+    open(url, makeSession());
+    expect(await screen.findByRole("heading", { name: "404" }))
+      .toBeInTheDocument();
+  });
+
+  test.each([
+    "/follow",
+    "/follow/playlists",
+    "/music/follow/playlists",
+    "/notifications",
+    "/settings",
+    "/manage",
+    "/community",
+    "/community/monthly",
+    "/@ann/dumps/a-find/edit",
+  ])("%s sends a guest to sign in, and back", async (url) => {
+    open(url, null);
+    await waitFor(() => expect(currentPath()).toBe(next(url)));
+  });
+
+  test.each(["/login", "/register"])(
+    "%s sends a signed-in user home",
+    async (url) => {
+      open(url, makeSession());
+      await waitFor(() => expect(currentPath()).toBe("/"));
+    },
+  );
+});