From 3f8ae3f558446aba3870e90c899db25ad9321499 Mon Sep 17 00:00:00 2001
From: Armand Philippot <git@armandphilippot.com>
Date: Tue, 24 Oct 2023 18:48:57 +0200
Subject: refactor(components): rewrite Pagination component

---
 .../organisms/nav/pagination/pagination.test.tsx   | 176 +++++++++++++++++++++
 1 file changed, 176 insertions(+)
 create mode 100644 src/components/organisms/nav/pagination/pagination.test.tsx

(limited to 'src/components/organisms/nav/pagination/pagination.test.tsx')

diff --git a/src/components/organisms/nav/pagination/pagination.test.tsx b/src/components/organisms/nav/pagination/pagination.test.tsx
new file mode 100644
index 0000000..336e306
--- /dev/null
+++ b/src/components/organisms/nav/pagination/pagination.test.tsx
@@ -0,0 +1,176 @@
+import { describe, expect, it } from '@jest/globals';
+import { render, screen as rtlScreen } from '@testing-library/react';
+import {
+  Pagination,
+  type RenderPaginationItemAriaLabel,
+  type RenderPaginationLink,
+} from './pagination';
+
+const pagePrefix = '#page-';
+const backwardLabel = 'omnis assumenda ex';
+const forwardLabel = 'voluptatum aut molestiae';
+const currentPageLabelPrefix = 'est nostrum a';
+const pageLabelPrefix = 'reprehenderit qui unde';
+
+const renderLink: RenderPaginationLink = (num: number) => `${pagePrefix}${num}`;
+
+const renderItemAriaLabel: RenderPaginationItemAriaLabel = ({
+  kind,
+  pageNumber,
+  isCurrentPage,
+}) => {
+  switch (kind) {
+    case 'backward':
+      return backwardLabel;
+    case 'forward':
+      return forwardLabel;
+    case 'number':
+    default:
+      return isCurrentPage
+        ? `${currentPageLabelPrefix}${pageNumber}`
+        : `${pageLabelPrefix}${pageNumber}`;
+  }
+};
+
+describe('Pagination', () => {
+  it('renders a list of items in a nav element', () => {
+    const ariaLabel = 'expedita repellat rem';
+    const current = 1;
+    const total = 1;
+
+    render(
+      <Pagination
+        aria-label={ariaLabel}
+        current={current}
+        renderItemAriaLabel={renderItemAriaLabel}
+        renderLink={renderLink}
+        total={total}
+      />
+    );
+
+    expect(
+      rtlScreen.getByRole('navigation', { name: ariaLabel })
+    ).toBeInTheDocument();
+    expect(rtlScreen.getAllByRole('listitem')).toHaveLength(total);
+  });
+
+  it('can render a forward link when there is more than one page', () => {
+    const ariaLabel = 'expedita repellat rem';
+    const current = 1;
+    const total = 3;
+
+    render(
+      <Pagination
+        aria-label={ariaLabel}
+        current={current}
+        renderItemAriaLabel={renderItemAriaLabel}
+        renderLink={renderLink}
+        total={total}
+      />
+    );
+
+    expect(
+      rtlScreen.getByRole('link', { name: forwardLabel })
+    ).toBeInTheDocument();
+    // the pages links + the forward link
+    expect(rtlScreen.getAllByRole('listitem')).toHaveLength(total + 1);
+  });
+
+  it('can render a backward link when the last page is selected', () => {
+    const ariaLabel = 'expedita repellat rem';
+    const total = 3;
+
+    render(
+      <Pagination
+        aria-label={ariaLabel}
+        current={total}
+        renderItemAriaLabel={renderItemAriaLabel}
+        renderLink={renderLink}
+        total={total}
+      />
+    );
+
+    expect(
+      rtlScreen.getByRole('link', { name: backwardLabel })
+    ).toBeInTheDocument();
+    // the pages links + the backward link
+    expect(rtlScreen.getAllByRole('listitem')).toHaveLength(total + 1);
+  });
+
+  it('can skip next pages when the total is high and first page is selected', () => {
+    const ariaLabel = 'expedita repellat rem';
+    const current = 1;
+    const total = 50;
+    /*
+     * First page & the two next pages + 1 ellipsis + last page + forward link
+     */
+    const expectedItemsCount = 6;
+
+    render(
+      <Pagination
+        aria-label={ariaLabel}
+        current={current}
+        renderItemAriaLabel={renderItemAriaLabel}
+        renderLink={renderLink}
+        total={total}
+      />
+    );
+
+    expect(rtlScreen.getAllByRole('listitem')).toHaveLength(expectedItemsCount);
+    // The current page and the ellipsis should not be linked.
+    expect(rtlScreen.getAllByRole('link')).toHaveLength(expectedItemsCount - 2);
+  });
+
+  it('can skip previous pages when the total is high and last page is selected', () => {
+    const ariaLabel = 'expedita repellat rem';
+    const current = 50;
+    const total = 50;
+    /*
+     * Last page & the two previous pages + 1 ellipsis + first page + backward
+     * link
+     */
+    const expectedItemsCount = 6;
+
+    render(
+      <Pagination
+        aria-label={ariaLabel}
+        current={current}
+        renderItemAriaLabel={renderItemAriaLabel}
+        renderLink={renderLink}
+        total={total}
+      />
+    );
+
+    expect(rtlScreen.getAllByRole('listitem')).toHaveLength(expectedItemsCount);
+    // The current page and the ellipsis should not be linked.
+    expect(rtlScreen.getAllByRole('link')).toHaveLength(expectedItemsCount - 2);
+  });
+
+  it('can render a custom number of siblings', () => {
+    const ariaLabel = 'expedita repellat rem';
+    const siblings = 3;
+    const current = 10;
+    const total = 20;
+    /*
+     * Current page + 3 siblings on each side + first page + last page + 2
+     * ellipsis + backward and forward links
+     */
+    const expectedItemsCount = 13;
+
+    render(
+      <Pagination
+        aria-label={ariaLabel}
+        current={current}
+        renderItemAriaLabel={renderItemAriaLabel}
+        renderLink={renderLink}
+        siblings={siblings}
+        total={total}
+      />
+    );
+
+    expect(rtlScreen.getAllByRole('listitem')).toHaveLength(expectedItemsCount);
+    /* eslint-disable-next-line @typescript-eslint/no-magic-numbers -- The
+    current page and the two ellipsis should not be linked. */
+    expect(rtlScreen.getAllByRole('link')).toHaveLength(expectedItemsCount - 3);
+  });
+});
-- 
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