Add tests for sessions, guards, API error details and the app layout load

web-player/src/routes/(app)/layout.server.test.ts

@@ -0,0 +1,64 @@
+import { beforeEach, describe, expect, it, vi } from 'vitest';
+
+const allowAnonymous = vi.hoisted(() => vi.fn());
+
+vi.mock('$lib/server/playbackConfig', () => ({ getAllowAnonymousListening: allowAnonymous }));
+vi.mock('$lib/server/config', () => ({
+	authConfig: { issuer: 'https://auth.example.com/' },
+	apiConfig: { baseUrl: 'http://api.test' }
+}));
+
+import { load } from './+layout.server';
+
+type LoadEvent = Parameters<typeof load>[0];
+
+function event(user: { sub: string; name: string } | null, fetchFn = vi.fn()) {
+	return {
+		locals: { user, accessToken: user ? 'token' : null },
+		url: new URL('http://x/library?q=1'),
+		fetch: fetchFn
+	} as unknown as LoadEvent;
+}
+
+beforeEach(() => {
+	allowAnonymous.mockReset();
+});
+
+describe('(app) layout load', () => {
+	it('redirects to login without a session or anonymous listening', async () => {
+		allowAnonymous.mockResolvedValue(false);
+		await expect(load(event(null))).rejects.toMatchObject({
+			status: 302,
+			location: `/auth?returnTo=${encodeURIComponent('/library?q=1')}`
+		});
+	});
+
+	it('returns empty data in anonymous mode without calling the API', async () => {
+		allowAnonymous.mockResolvedValue(true);
+		const fetchFn = vi.fn();
+		const data = await load(event(null, fetchFn));
+		expect(data).toMatchObject({
+			user: null,
+			allowAnonymousListening: true,
+			userPlaylists: [],
+			userPlaylistsTotal: 0,
+			likedTracks: [],
+			lastPlayedTrack: null,
+			accountUrl: 'https://auth.example.com/ui/console'
+		});
+		expect(fetchFn).not.toHaveBeenCalled();
+	});
+
+	it('falls back to empty data when the API fails for a signed in user', async () => {
+		allowAnonymous.mockResolvedValue(false);
+		const fetchFn = vi.fn().mockRejectedValue(new Error('down'));
+		const data = await load(event({ sub: 'u1', name: 'Ana' }, fetchFn));
+		expect(data).toMatchObject({
+			user: { sub: 'u1' },
+			userPlaylists: [],
+			userPlaylistsTotal: 0,
+			likedTracks: [],
+			lastPlayedTrack: null
+		});
+	});
+});