public function testCustomer()
{
$this->address->unsetData('cusomer_id');
$this->assertFalse($this->address->getCustomer());
$this->address->setCustomerId(self::ORIG_CUSTOMER_ID);
$customer = $this->address->getCustomer();
$this->assertEquals(self::ORIG_CUSTOMER_ID, $customer->getId());
/** @var \Magento\Customer\Model\Customer $customer */
$customer = $this->getMockBuilder('Magento\\Customer\\Model\\Customer')->disableOriginalConstructor()->getMock();
$customer->expects($this->any())->method('getId')->will($this->returnValue(self::ORIG_CUSTOMER_ID + 1));
$this->address->setCustomer($customer);
$this->assertEquals(self::ORIG_CUSTOMER_ID + 1, $this->address->getCustomerId());
}