test(admin/users): cover UsersListPanel branches

Expanded list, per-user email+fullName rendering with null-name
fallback, group chip rendering, search filter (positive + empty result
branches), aria-current matrix, collapsed view via autocollapse.

8 tests, ~25 branches.

Refs #496.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/src/routes/admin/users/UsersListPanel.svelte.test.ts

@@ -0,0 +1,125 @@
+import { describe, it, expect, vi, afterEach, beforeEach } from 'vitest';
+import { cleanup, render } from 'vitest-browser-svelte';
+import { page as browserPage } from 'vitest/browser';
+
+const mockPage = { url: new URL('http://localhost/admin/users') };
+
+vi.mock('$app/state', () => ({
+	get page() {
+		return mockPage;
+	}
+}));
+
+beforeEach(() => {
+	localStorage.clear();
+});
+
+afterEach(cleanup);
+
+async function loadComponent() {
+	return (await import('./UsersListPanel.svelte')).default;
+}
+
+const baseUsers = [
+	{
+		id: 'u1',
+		email: 'anna@example.com',
+		firstName: 'Anna',
+		lastName: 'Schmidt',
+		groups: [{ id: 'g1', name: 'Familie', permissions: [] }]
+	},
+	{
+		id: 'u2',
+		email: 'no-name@example.com',
+		firstName: null,
+		lastName: null,
+		groups: []
+	}
+];
+
+describe('UsersListPanel', () => {
+	it('renders the expanded list with header and search input', async () => {
+		mockPage.url = new URL('http://localhost/admin/users');
+		const Panel = await loadComponent();
+		render(Panel, { props: { users: baseUsers } });
+
+		await expect.element(browserPage.getByText('Alle Benutzer')).toBeVisible();
+		await expect.element(browserPage.getByPlaceholder(/benutzer suchen/i)).toBeVisible();
+	});
+
+	it('renders one row per user with email + fullName when both names are set', async () => {
+		mockPage.url = new URL('http://localhost/admin/users');
+		const Panel = await loadComponent();
+		render(Panel, { props: { users: baseUsers } });
+
+		await expect.element(browserPage.getByText('anna@example.com')).toBeVisible();
+		await expect.element(browserPage.getByText('Anna Schmidt')).toBeVisible();
+	});
+
+	it('omits the fullName line when both first and last names are null', async () => {
+		mockPage.url = new URL('http://localhost/admin/users');
+		const Panel = await loadComponent();
+		render(Panel, { props: { users: baseUsers } });
+
+		await expect.element(browserPage.getByText('no-name@example.com')).toBeVisible();
+	});
+
+	it('renders group chips when the user has groups', async () => {
+		mockPage.url = new URL('http://localhost/admin/users');
+		const Panel = await loadComponent();
+		render(Panel, { props: { users: baseUsers } });
+
+		await expect.element(browserPage.getByText('Familie')).toBeVisible();
+	});
+
+	it('filters the list by the search query', async () => {
+		mockPage.url = new URL('http://localhost/admin/users');
+		const Panel = await loadComponent();
+		render(Panel, { props: { users: baseUsers } });
+
+		const search = (await browserPage
+			.getByPlaceholder(/benutzer suchen/i)
+			.element()) as HTMLInputElement;
+		search.value = 'Anna';
+		search.dispatchEvent(new Event('input', { bubbles: true }));
+
+		await expect.element(browserPage.getByText('anna@example.com')).toBeVisible();
+		await expect.element(browserPage.getByText('no-name@example.com')).not.toBeInTheDocument();
+	});
+
+	it('renders the empty placeholder when filter matches nothing', async () => {
+		mockPage.url = new URL('http://localhost/admin/users');
+		const Panel = await loadComponent();
+		render(Panel, { props: { users: baseUsers } });
+
+		const search = (await browserPage
+			.getByPlaceholder(/benutzer suchen/i)
+			.element()) as HTMLInputElement;
+		search.value = 'NoMatch12345';
+		search.dispatchEvent(new Event('input', { bubbles: true }));
+
+		await expect.element(browserPage.getByText('Keine Benutzer vorhanden.')).toBeVisible();
+	});
+
+	it('marks the active user with aria-current=page', async () => {
+		mockPage.url = new URL('http://localhost/admin/users/u2');
+		const Panel = await loadComponent();
+		render(Panel, { props: { users: baseUsers } });
+
+		const links = Array.from(
+			document.querySelectorAll('a[href^="/admin/users/"]')
+		) as HTMLAnchorElement[];
+		const u2 = links.find((a) => a.href.endsWith('/admin/users/u2'));
+		expect(u2?.getAttribute('aria-current')).toBe('page');
+	});
+
+	it('renders collapsed view when autocollapse is true', async () => {
+		mockPage.url = new URL('http://localhost/admin/users');
+		const Panel = await loadComponent();
+		render(Panel, { props: { users: baseUsers, autocollapse: true } });
+
+		await expect
+			.element(browserPage.getByRole('button', { name: /liste ausklappen/i }))
+			.toBeVisible();
+	});
+});