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

web-player/src/lib/server/guards.test.ts

@@ -0,0 +1,52 @@
+import { describe, expect, it } from 'vitest';
+import { loginRedirect, optionalUser, requireUser } from './guards';
+
+const user = { sub: 'u1', name: 'Ana' };
+
+function redirectOf(fn: () => unknown): { status: number; location: string } {
+	try {
+		fn();
+	} catch (thrown) {
+		return thrown as { status: number; location: string };
+	}
+	throw new Error('Expected a redirect');
+}
+
+describe('loginRedirect', () => {
+	it('redirects to /auth with the encoded path and query', () => {
+		const result = redirectOf(() => loginRedirect(new URL('http://x/albums/1?tab=a&b=c')));
+		expect(result.status).toBe(302);
+		expect(result.location).toBe(`/auth?returnTo=${encodeURIComponent('/albums/1?tab=a&b=c')}`);
+	});
+});
+
+describe('requireUser', () => {
+	it('returns the user when signed in', () => {
+		const locals = { user, accessToken: 't' } as App.Locals;
+		expect(requireUser(locals, new URL('http://x/'))).toBe(user);
+	});
+
+	it('redirects when there is no user', () => {
+		const locals = { user: null, accessToken: null } as App.Locals;
+		const result = redirectOf(() => requireUser(locals, new URL('http://x/library')));
+		expect(result.location).toBe('/auth?returnTo=%2Flibrary');
+	});
+});
+
+describe('optionalUser', () => {
+	it('returns the user when signed in', () => {
+		const locals = { user, accessToken: 't' } as App.Locals;
+		expect(optionalUser(locals, new URL('http://x/'), false)).toBe(user);
+	});
+
+	it('returns null for anonymous listening', () => {
+		const locals = { user: null, accessToken: null } as App.Locals;
+		expect(optionalUser(locals, new URL('http://x/'), true)).toBeNull();
+	});
+
+	it('redirects anonymous visitors when listening is not allowed', () => {
+		const locals = { user: null, accessToken: null } as App.Locals;
+		const result = redirectOf(() => optionalUser(locals, new URL('http://x/albums/1'), false));
+		expect(result.location).toBe('/auth?returnTo=%2Falbums%2F1');
+	});
+});