Oinktube/node_modules/fizzy-ui-utils/test/unit/get-parent.js

QUnit.test( 'getParent', function( assert ) {

  let getParent = fizzyUIUtils.getParent;

  let gridA = document.querySelector('.grid-a');
  let itemA1 = document.querySelector('.item-a1');

  let parent = getParent( itemA1, '.grid' );
  assert.equal( parent, gridA, 'got grid parent from item' );

  parent = getParent( document.querySelector('.span-a3'), '.grid' );
  assert.equal( parent, gridA, 'got grid parent from span' );

  parent = getParent( itemA1, '#qunit' );
  assert.ok( parent === undefined, 'parent not tree is undefined' );

  let treeNotInDocument = document.createElement('div');
  treeNotInDocument.innerHTML =
    '<div class="a">' +
      '<div class="a1">' +
    '</div>';

  parent = getParent( treeNotInDocument.querySelector('.a1'), '.not-found' );

  assert.ok(
      parent === undefined,
      'Parent should be `undefined` even when the given tree is not in the document',
  );

} );