public function testApply()
{
$stateKey = 'sk';
$this->registry->expects($this->once())->method('registry')->with($this->equalTo('current_category'))->will($this->returnValue($this->category));
$this->stateKeyGenerator->expects($this->once())->method('toString')->with($this->equalTo($this->category))->will($this->returnValue($stateKey));
$this->state->expects($this->any())->method('getFilters')->will($this->returnValue([$this->filter]));
$this->filter->expects($this->once())->method('getFilter')->will($this->returnValue($this->abstractFilter));
$this->filter->expects($this->once())->method('getValueString')->will($this->returnValue('t'));
$this->abstractFilter->expects($this->once())->method('getRequestVar')->will($this->returnValue('t'));
$result = $this->model->apply();
$this->assertInstanceOf('\\Magento\\Catalog\\Model\\Layer', $result);
}
