app/javascript/mastodon/features/ui/components/__tests__/column-test.js


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import { render, fireEvent, screen } from '@testing-library/react';
import React from 'react';
import Column from '../column';

describe('<Column />', () => {
  describe('<ColumnHeader /> click handler', () => {
    it('runs the scroll animation if the column contains scrollable content', () => {
      const scrollToMock = jest.fn();
      const { container } = render(
        <Column heading='notifications'>
          <div className='scrollable' />
        </Column>,
      );
      container.querySelector('.scrollable').scrollTo = scrollToMock;
      fireEvent.click(screen.getByText('notifications'));
      expect(scrollToMock).toHaveBeenCalledWith({ behavior: 'smooth', top: 0 });
    });

    it('does not try to scroll if there is no scrollable content', () => {
      render(<Column heading='notifications' />);
      fireEvent.click(screen.getByText('notifications'));
    });
  });
});