Refactor and fix main app tests

shlink-web-component/test/utils/components/SimplePaginator.test.tsx

@@ -0,0 +1,47 @@
+import { render, screen } from '@testing-library/react';
+import { SimplePaginator } from '../../../src/utils/components/SimplePaginator';
+import { ELLIPSIS } from '../../../src/utils/helpers/pagination';
+
+describe('<SimplePaginator />', () => {
+  const setUp = (pagesCount: number, currentPage = 1) => render(
+    <SimplePaginator pagesCount={pagesCount} currentPage={currentPage} setCurrentPage={vi.fn()} />,
+  );
+
+  it.each([-3, -2, 0, 1])('renders empty when the amount of pages is smaller than 2', (pagesCount) => {
+    const { container } = setUp(pagesCount);
+    expect(container.firstChild).toBeNull();
+  });
+
+  describe('ELLIPSIS are rendered where expected', () => {
+    const getItemsForPages = (pagesCount: number, currentPage: number) => {
+      setUp(pagesCount, currentPage);
+
+      const items = screen.getAllByRole('link');
+      const itemsWithEllipsis = items.filter((item) => item.innerHTML.includes(ELLIPSIS));
+
+      return { items, itemsWithEllipsis };
+    };
+
+    it('renders first ELLIPSIS', () => {
+      const { items, itemsWithEllipsis } = getItemsForPages(9, 7);
+
+      expect(items[1]).toHaveTextContent(ELLIPSIS);
+      expect(itemsWithEllipsis).toHaveLength(1);
+    });
+
+    it('renders last ELLIPSIS', () => {
+      const { items, itemsWithEllipsis } = getItemsForPages(9, 2);
+
+      expect(items[items.length - 2]).toHaveTextContent(ELLIPSIS);
+      expect(itemsWithEllipsis).toHaveLength(1);
+    });
+
+    it('renders both ELLIPSIS', () => {
+      const { items, itemsWithEllipsis } = getItemsForPages(20, 9);
+
+      expect(items[1]).toHaveTextContent(ELLIPSIS);
+      expect(items[items.length - 2]).toHaveTextContent(ELLIPSIS);
+      expect(itemsWithEllipsis).toHaveLength(2);
+    });
+  });
+});