add pagination tests (#88)

src/components/Pagination/Pagination.test.tsx

@@ -0,0 +1,40 @@
+import '@testing-library/jest-dom';
+import { fireEvent, render, screen, waitFor } from '@testing-library/react';
+import { Pagination } from './Pagination';
+
+describe('<Pagination />', () => {
+  it('displays pagination controls when provided', () => {
+    render(<Pagination page={2} pageCount={3} />);
+    const next = screen.getByText('Next');
+    expect(next).toBeInTheDocument();
+
+    const prev = screen.getByText('Previous');
+    expect(prev).toBeInTheDocument();
+  });
+
+  it('disables previous button on first page', () => {
+    render(<Pagination page={1} pageCount={3} />);
+    const prev = screen.getByText('Previous');
+    expect(prev.classList.contains('a-btn__disabled')).toBe(true);
+  });
+
+  it('disables next button on last page', () => {
+    render(<Pagination page={3} pageCount={3} />);
+    const next = screen.getByText('Next');
+    expect(next.classList.contains('a-btn__disabled')).toBe(true);
+  });
+
+  it('goes to page on submit', () => {
+    render(<Pagination page={2} pageCount={3} />);
+    const next = screen.getByText('Next');
+    const input = screen.getByDisplayValue('2');
+    const go = screen.getByText('Go');
+
+    fireEvent.change(input, { target: { value: '3' } });
+    fireEvent.click(go);
+
+    waitFor(() => {
+      expect(next.classList.contains('a-btn__disabled')).toBe(true);
+    });
+  });
+});