content: import { render, fireEvent, screen } from '@testing-library/react';
  import React from 'react';
  import renderer from 'react-test-renderer';
  import Button from '../button';
  
  describe('<Button />', () => {
    it('renders a button element', () => {
      const component = renderer.create(<Button />);
      const tree      = component.toJSON();
  
      expect(tree).toMatchSnapshot();
    });
  
    it('renders the given text', () => {
      const text      = 'foo';
      const component = renderer.create(<Button text={text} />);
      const tree      = component.toJSON();
  
      expect(tree).toMatchSnapshot();
    });
  
    it('handles click events using the given handler', () => {
      const handler = jest.fn();
      render(<Button onClick={handler}>button</Button>);
      fireEvent.click(screen.getByText('button'));
  
      expect(handler.mock.calls.length).toEqual(1);
    });
  
    it('does not handle click events if props.disabled given', () => {
      const handler = jest.fn();
      render(<Button onClick={handler} disabled>button</Button>);
      fireEvent.click(screen.getByText('button'));
  
      expect(handler.mock.calls.length).toEqual(0);
    });
  
    it('renders a disabled attribute if props.disabled given', () => {
      const component = renderer.create(<Button disabled />);
      const tree      = component.toJSON();
  
      expect(tree).toMatchSnapshot();
    });
  
    it('renders the children', () => {
      const children  = <p>children</p>;
      const component = renderer.create(<Button>{children}</Button>);
      const tree      = component.toJSON();
  
      expect(tree).toMatchSnapshot();
    });
  
    it('renders the props.text instead of children', () => {
      const text      = 'foo';
      const children  = <p>children</p>;
      const component = renderer.create(<Button text={text}>{children}</Button>);
      const tree      = component.toJSON();
  
      expect(tree).toMatchSnapshot();
    });
  
    it('renders class="button--block" if props.block given', () => {
      const component = renderer.create(<Button block />);
      const tree      = component.toJSON();
  
      expect(tree).toMatchSnapshot();
    });
  
    it('adds class "button-secondary" if props.secondary given', () => {
      const component = renderer.create(<Button secondary />);
      const tree      = component.toJSON();
  
      expect(tree).toMatchSnapshot();
    });
  });
  