Testing filter-grayscale

describe('filter-grayscale', function() {
  var mixin;
  var called;
  
  beforeEach(function() {
    mixin = sassaby.includedMixin('filter-grayscale');
    called = mixin.calledWith('50%');
  });
  
  it('should make the correct declarations', function() {
    called.declares('-webkit-filter', 'grayscale(50%)');
    called.declares('-moz-filter', 'grayscale(50%)');
    called.declares('-ms-filter', 'grayscale(50%)');
    called.declares('-o-filter', 'grayscale(50%)');
    called.declares('filter', 'grayscale(50%)');
  });
});