frontend/__tests__/Pagination.test.js


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import React from 'react';
import { shallow, mount } from 'enzyme';
import toJSON from 'enzyme-to-json';
import { Pagination } from '../components/Pagination';

const fakeQuery = {
  itemsConnection: { aggregate: { count: 18 } },
};

describe('<Pagination/>', () => {
  it('displays loading message', () => {
    const wrapper = shallow(<Pagination loading page={1} itemsQuery={fakeQuery} />);
    expect(toJSON(wrapper)).toMatchSnapshot();
  });

  it('renders pagination for 18 items', () => {
    const wrapper = shallow(<Pagination loading={false} page={1} itemsQuery={fakeQuery} />);
    expect(toJSON(wrapper)).toMatchSnapshot();
    expect(wrapper.find('.totalPages').text()).toEqual('2');
  });

  it('renders pagination for 28 items', () => {
    const fakeQuery2 = {
      itemsConnection: { aggregate: { count: 28 } },
    };
    const wrapper = shallow(<Pagination loading={false} page={1} itemsQuery={fakeQuery2} />);
    expect(wrapper.find('.totalPages').text()).toEqual('4');
  });

  it('disables and enables next/prev buttons', () => {
    const fakeQuery3 = {
      itemsConnection: { aggregate: { count: 100 } },
    };
    const wrapper = shallow(<Pagination loading={false} page={1} itemsQuery={fakeQuery} />);

    expect(wrapper.find('a.prev').props()['aria-disabled']).toEqual(true);
    expect(wrapper.find('a.next').props()['aria-disabled']).toEqual(false);
    wrapper.setProps({ page: 2 });
    expect(wrapper.find('a.prev').props()['aria-disabled']).toEqual(false);
    expect(wrapper.find('a.next').props()['aria-disabled']).toEqual(true);
    // when in the middle, both should work
    wrapper.setProps({ itemsQuery: fakeQuery3, page: 3 });
    expect(wrapper.find('a.prev').props()['aria-disabled']).toEqual(false);
    expect(wrapper.find('a.next').props()['aria-disabled']).toEqual(false);
  });
});