test(shared/primitives): cover Pagination branches

Hidden when totalPages <= 1, prev/next disabled state matrix at
boundaries, link form when in range, aria-current for active page,
mobile page label, left ellipsis / right ellipsis branches based on
window position, custom ariaLabel.

11 tests covering ~30 of Pagination's branches.

Refs #496.

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

frontend/src/lib/shared/primitives/Pagination.svelte.test.ts

@@ -0,0 +1,87 @@
+import { describe, it, expect, afterEach } from 'vitest';
+import { cleanup, render } from 'vitest-browser-svelte';
+import Pagination from './Pagination.svelte';
+
+afterEach(cleanup);
+
+const makeHref = (p: number) => `/?page=${p}`;
+
+describe('Pagination', () => {
+	it('renders nothing when totalPages is 1 or less', async () => {
+		render(Pagination, { props: { page: 0, totalPages: 1, makeHref } });
+
+		expect(document.querySelector('nav')).toBeNull();
+	});
+
+	it('renders the nav when totalPages > 1', async () => {
+		render(Pagination, { props: { page: 0, totalPages: 5, makeHref } });
+
+		expect(document.querySelector('nav')).not.toBeNull();
+	});
+
+	it('disables the prev control on the first page', async () => {
+		render(Pagination, { props: { page: 0, totalPages: 5, makeHref } });
+
+		const prev = document.querySelector('[data-testid="pagination-prev"]') as HTMLElement;
+		expect(prev.tagName).toBe('SPAN');
+	});
+
+	it('renders the prev control as a link when not on the first page', async () => {
+		render(Pagination, { props: { page: 2, totalPages: 5, makeHref } });
+
+		const prev = document.querySelector('[data-testid="pagination-prev"]') as HTMLAnchorElement;
+		expect(prev.tagName).toBe('A');
+		expect(prev.href).toContain('page=1');
+	});
+
+	it('disables the next control on the last page', async () => {
+		render(Pagination, { props: { page: 4, totalPages: 5, makeHref } });
+
+		const next = document.querySelector('[data-testid="pagination-next"]') as HTMLElement;
+		expect(next.tagName).toBe('SPAN');
+	});
+
+	it('renders the next control as a link when not on the last page', async () => {
+		render(Pagination, { props: { page: 0, totalPages: 5, makeHref } });
+
+		const next = document.querySelector('[data-testid="pagination-next"]') as HTMLAnchorElement;
+		expect(next.tagName).toBe('A');
+		expect(next.href).toContain('page=1');
+	});
+
+	it('marks the active page button with aria-current=page', async () => {
+		render(Pagination, { props: { page: 2, totalPages: 5, makeHref } });
+
+		const active = document.querySelector('[data-testid="pagination-page-3"]') as HTMLElement;
+		expect(active.getAttribute('aria-current')).toBe('page');
+	});
+
+	it('renders the mobile page label', async () => {
+		render(Pagination, { props: { page: 1, totalPages: 5, makeHref } });
+
+		const label = document.querySelector('[data-testid="pagination-page-label"]');
+		expect(label?.textContent).toContain('2');
+		expect(label?.textContent).toContain('5');
+	});
+
+	it('renders left ellipsis when current page is far enough from page 1', async () => {
+		render(Pagination, { props: { page: 7, totalPages: 10, makeHref } });
+
+		expect(document.querySelector('[data-testid="pagination-ellipsis-left"]')).not.toBeNull();
+	});
+
+	it('renders right ellipsis when current page is far from last', async () => {
+		render(Pagination, { props: { page: 1, totalPages: 10, makeHref } });
+
+		expect(document.querySelector('[data-testid="pagination-ellipsis-right"]')).not.toBeNull();
+	});
+
+	it('uses the supplied ariaLabel when provided', async () => {
+		render(Pagination, {
+			props: { page: 0, totalPages: 5, makeHref, ariaLabel: 'Custom pagination' }
+		});
+
+		const nav = document.querySelector('nav');
+		expect(nav?.getAttribute('aria-label')).toBe('Custom pagination');
+	});
+});