grafana/public/app/features/alerting/unified/components/CollapseToggle.test.tsx

import { render, screen } from '@testing-library/react';
import { noop } from 'lodash';
import React from 'react';

import { CollapseToggle } from './CollapseToggle';

describe('TestToggle', () => {
  it('should render text', () => {
    render(<CollapseToggle isCollapsed={true} text="Hello, world" onToggle={noop} />);
    expect(screen.getByRole('button')).toHaveTextContent('Hello, world');
  });

  it('should respect isCollapsed', () => {
    const { rerender } = render(<CollapseToggle isCollapsed={false} text="Hello, world" onToggle={noop} />);
    expect(screen.getByRole('button', { expanded: true })).toBeInTheDocument();

    rerender(<CollapseToggle isCollapsed={true} text="Hello, world" onToggle={noop} />);
    expect(screen.getByRole('button', { expanded: false })).toBeInTheDocument();
  });

  it('should call onToggle', () => {
    const onToggle = jest.fn();
    render(<CollapseToggle isCollapsed={true} text="Hello, world" onToggle={onToggle} />);
    screen.getByRole('button').click();

    expect(onToggle).toHaveBeenCalledWith(false);
    // it should also not have any impact on the actual expanded state since the component does not track its own state
    expect(screen.getByRole('button', { expanded: false })).toBeInTheDocument();
  });
});