/**
  * @depends	testAddFilterGetFiltersIsFilters
  * @return	null
  */
 public function testAddFilterDoesNotPreventDuplicates()
 {
     $filter = $this->getMock($this->filterInterface);
     $this->chain->addFilter($filter)->addFilter($filter);
     $this->assertTrue($this->chain->isFilters());
     $expected = array($filter, $filter);
     $this->assertEquals($expected, $this->chain->getFilters());
 }