public function testDeleteWithoutCard()
 {
     $this->backend = $this->getMockBuilder('OCA\\DAV\\CardDAV\\CardDavBackend')->setConstructorArgs([$this->db, $this->principal, null])->setMethods(['getCardId', 'addChange', 'purgeProperties', 'updateProperties'])->getMock();
     // create a new address book
     $this->backend->createAddressBook(self::UNIT_TEST_USER, 'Example', []);
     $books = $this->backend->getAddressBooksForUser(self::UNIT_TEST_USER);
     $this->assertEquals(1, count($books));
     $bookId = $books[0]['id'];
     $uri = $this->getUniqueID('card');
     // create a new address book
     $this->backend->expects($this->once())->method('getCardId')->with($bookId, $uri)->willThrowException(new \InvalidArgumentException());
     $this->backend->expects($this->exactly(2))->method('addChange')->withConsecutive([$bookId, $uri, 1], [$bookId, $uri, 3]);
     $this->backend->expects($this->never())->method('purgeProperties');
     // create a card
     $this->backend->createCard($bookId, $uri, '');
     // delete the card
     $this->assertTrue($this->backend->deleteCard($bookId, $uri));
 }