public function testBindCustomerLogout()
{
$observer = new \Magento\Framework\Object();
$this->visitor->setCustomerId('1');
$this->visitor->bindCustomerLogout($observer);
$this->assertTrue($this->visitor->getDoCustomerLogout());
$this->visitor->unsetData();
$this->visitor->bindCustomerLogout($observer);
$this->assertNull($this->visitor->getDoCustomerLogout());
}