[英]Spock - mocked repository method save() giving NullPointerException
我正在使用Spock对应用程序中的服务进行单元测试。 最近,我遇到了一个我不太了解的怪异行为。
这是我的单元测试:
def setup() {
parkingSessionRepository = Mock(ParkingSessionRepository.class)
parkingSessionMapper = Stub(ParkingSessionMapper.class)
parkingMeterService = new ParkingMeterService(parkingSessionRepository, parkingSessionMapper)
}
def "should start parking session for vehicle that doesn't have an active parking session"() {
given:
String testVehicleId = "AWC1342"
long testParkingRateId = 1
ParkingStartDTO testParkingStartDTO = ParkingStartDTO.builder()
.vehicleId(testVehicleId)
.parkingRateId(testParkingRateId)
.build()
ParkingSession testParkingSession = ParkingSession.builder()
.vehicleId(testVehicleId)
.parkingRate(ParkingRate.REGULAR)
.build()
parkingSessionMapper.fromParkingStartDTO(_) >> testParkingSession
parkingSessionRepository.save(_ as ParkingSession) >> testParkingSession
parkingSessionRepository.findByVehicleIdAndStopTimeIsNull(_ as String) >> Optional.empty()
when:
ParkingMeterResponseDTO parkingMeterResponseDTO = parkingMeterService.startParkingMeter(testParkingStartDTO)
then:
1 * parkingSessionRepository.save(_ as ParkingSession)
parkingMeterResponseDTO.vehicleId == testVehicleId
Assert.assertNotNull(parkingMeterResponseDTO.parkingSessionId)
Assert.assertNotNull(parkingMeterResponseDTO.timestamp)
}
而经过测试的服务方法的代码是:
public ParkingMeterResponseDTO startParkingMeter(final ParkingStartDTO parkingStartDTO) {
String vehicleId = parkingStartDTO.getVehicleId();
if (isParkingSessionAlreadyActive(vehicleId)) {
throw new ParkingSessionAlreadyActiveException();
} else {
ParkingSession parkingSession = parkingSessionMapper.fromParkingStartDTO(parkingStartDTO);
parkingSession.setStartTime(Timestamp.from(Instant.now()));
parkingSession = parkingSessionRepository.save(parkingSession);
return ParkingMeterResponseDTO.builder()
.vehicleId(parkingSession.getVehicleId())
.parkingSessionId(parkingSession.getId())
.timestamp(parkingSession.getStartTime())
.build();
}
}
现在,当我运行单元测试时,来自“ when”块的结果是NullPointerException(save()方法返回null)。 但是,当我从'then'块中删除save()方法检查时-一切运行顺利,没有null。
发生这种行为的原因可能是什么? 我怀疑存储库存在一些模拟问题,但是我不确定幕后到底发生了什么以及如何解决该问题,因此“ then”块中的save()方法按预期工作了吗?
请检查Spock文档: http : //spockframework.org/spock/docs/1.0/interaction_based_testing.html
部分: 模拟和存根结合
结合:
given:
...
parkingSessionRepository.save(_ as ParkingSession) >> testParkingSession
...
then:
1 * parkingSessionRepository.save(_ as ParkingSession)
不管用。 您必须使用一个表达式:
1 * parkingSessionRepository.save(_ as ParkingSession) >> testParkingSession
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