public function testDeleteHeadersByEmptyValue()
 {
     $this->module->setHeader('xxx', 'yyyy');
     $this->module->setHeader('xxx', '');
     $this->module->amOnPage('/');
     $this->assertFalse($this->history->getLastRequest()->hasHeader('xxx'));
 }
 public function testHeadersBySetHeader()
 {
     $this->module->setHeader('xxx', 'yyyy');
     $this->module->amOnPage('/');
     $this->assertTrue($this->history->getLastRequest()->hasHeader('xxx'));
 }