import { child } from './child';


describe( 'child', () => {
  beforeEach( () => {
    document.body.innerHTML = `
      <div id="container">
        <span id="span1" class="active"></span>
        <button id="button1" class="active"></button>
        <span id="span2"></span>
        <button id="button2"></button>
        <span id="span3"></span>
        <button id="button3"></button>
      </div>
    `;
  } );

  test( 'can return the child that matches the specified selector.', () => {
    const container = document.getElementById( 'container' );
    const span1     = child( container, 'span' );
    expect( span1.id ).toBe( 'span1' );

    const span2 = child( container, '#span2' );
    expect( span2.id ).toBe( 'span2' );

    const active = child( container, '.active' );
    expect( active.id ).toBe( 'span1' );
  } );

  test( 'can return the firstElementChild if the selector is omitted.', () => {
    const container = document.getElementById( 'container' );
    const span1     = child( container );
    expect( span1.id ).toBe( 'span1' );
  } );

  test( 'should rerun undefined if no element is found.', () => {
    const container = document.getElementById( 'container' );
    const elm       = child( container, 'nothing' );
    expect( elm ).toBeUndefined();
  } );
} );