text: var test = require('tape');
  var removeClass = require('./remove-class');
  
  
  function getEl(className) {
      var div = document.createElement('div');
      div.className = className;
      return div;
  }
  
  
  test('amp-remove-class', function (t) {
      var el = getEl('oh hello there');
      
      removeClass(el, 'oh');
      t.equal(el.className, 'hello there');   
      
      removeClass(el, 'oh');
      t.equal(el.className, 'hello there', 'removing non-existant class should do nothing');   
      
      removeClass(el, 'hello', 'there');
      t.equal(el.className, '', 'should be able to remove several');   
      
      removeClass(el, 'oh', 'hello', 'there');
      t.equal(el.className, '', 'should be ok if doing again');
  
      // reset it
      el = getEl('oh hello there');
  
      removeClass(el, undefined, null, NaN, 0, '');
      t.equal(el.className, 'oh hello there', 'should be reasonably tolerant of nonsense');
  
      el = getEl('undefined null NaN');
      removeClass(el, undefined, null, NaN, 0, '');
      t.equal(el.className, 'undefined null NaN', 'should not remove classes named `undefined` etc.');
  
      el = getEl('oh hello there');
      t.equal(el.className, 'oh hello there');
      removeClass(el, ['oh', 'hello', 'there']);
      t.equal(el.className, '');
  
      el = getEl('  oh   hello there');
      var clsName = el.className;
  
      t.equal(clsName, removeClass(el, 'not', 'changing').className, 'should not touch classNames if not modifying');
      t.equal(removeClass(el, 'hello', 'yo').className, 'oh there', 'should clean up classNames whitespacing, if modifying anyway');
  
      el = removeClass(getEl('foobar'), 'foo', 'bar');
      t.equal(el.className, 'foobar');
  
      el = getEl('oh hello there');
      t.equal(removeClass(el, 'hello there').className, 'oh', 'should support space separated string of classes');
  
      el = getEl('oh hello there');
      t.equal(removeClass(el, '\r  hello \t \nthere  ').className, 'oh', 'should support other weird whitespace when using a string of classes');
  
      t.end();
  });
  