public function testClearHeaderAndHeaderNotExists()
{
$response = $this->response = $this->getMock('Magento\\Framework\\HTTP\\PhpEnvironment\\Response', ['getHeaders', 'send']);
$this->headers->addHeaderLine('Header-name: header-value');
$header = \Zend\Http\Header\GenericHeader::fromString('Header-name: header-value');
$this->headers->expects($this->once())->method('has')->with('Header-name')->will($this->returnValue(false));
$this->headers->expects($this->never())->method('get')->with('Header-name')->will($this->returnValue($header));
$this->headers->expects($this->never())->method('removeHeader')->with($header);
$response->expects($this->once())->method('getHeaders')->will($this->returnValue($this->headers));
$response->clearHeader('Header-name');
}
