text: ( function() {
  
  'use strict';
  
  // position values can be off by 0.1% or 1px
  function isPositionApprox( value, expected ) {
    var isPercent = value.indexOf('%') != -1;
    value = parseFloat( value );
    var diff = Math.abs( expected - value );
    return isPercent ? diff < 0.1 : diff <= 1;
  }
  
  // loop through cells and check position values against expecteds
  function checkCellPositions( flkty, expecteds ) {
    var isOK;
    for ( var i=0, len = expecteds.length; i < len; i++ ) {
      var expected = expecteds[i];
      var cell = flkty.cells[i];
      var position = cell.element.style.left;
      isOK = isPositionApprox( position, expected );
      if ( !isOK ) {
        console.error( 'wrong cell position, index: ' + i + '. ' +
          'expected: ' + expected + '. position: ' + position );
        break;
      }
    }
    return isOK;
  }
  
  QUnit.test( 'position cells', function( assert ) {
  
    var flkty = new Flickity('#position-cells');
  
    assert.ok( checkCellPositions( flkty, [ 0, 40, 65, 125, 165, 225 ] ), 'percent cell position' );
    // .cell { margin: 0 2%; }
    flkty.element.classList.add('percent-margin');
    flkty.positionCells();
    assert.ok( checkCellPositions( flkty, [ 0, 44, 73, 137, 181, 245 ] ), 'percent cell position with margin' );
    flkty.element.classList.remove('percent-margin');
    // pixel-based position
    flkty.options.percentPosition = false;
    flkty.positionCells();
    assert.ok( checkCellPositions( flkty, [ 0, 160, 260, 500, 660, 900 ] ), 'pixel cell position' );
    // pixel margin, { margin: 0 10px; }
    flkty.element.classList.add('pixel-margin');
    flkty.positionCells();
    assert.ok( checkCellPositions( flkty, [ 0, 180, 300, 560, 740, 1000 ] ), 'pixel cell position with margin' );
  
  });
  
  })();
  