use userData from fixtures in Footer and Header

tests/components/Footer.test.ts

@@ -2,6 +2,7 @@ import { render, screen } from '@testing-library/svelte';
 import { describe, test, expect } from 'vitest';
 
 import { ROUTE_NAMES } from '../../src/routes';
+import { baseData } from '../fixtures';
 
 import Footer from '$lib/components/Footer.svelte';
 
@@ -19,12 +20,7 @@ describe('Footer component', () => {
 		expect(linkElement).toHaveAttribute('href', ROUTE_NAMES.ROOT);
 	});
 	test('Enthält Profil-Icon und entsprechenden Link: angemeldet', () => {
-		const mockData = {
-			user: {
-				id: 'admin'
-			}
-		};
-		render(Footer, { props: { data: mockData } });
+		render(Footer, { props: { data: baseData } });
 		const linkElement = screen.getByText('admin', { exact: false });
 		expect(linkElement).toBeInTheDocument();
 		expect(linkElement).toHaveAttribute('href', ROUTE_NAMES.ROOT);