使用Spock的Spring Boot集成测试：stubbed方法返回null

Question

@SpringBootTest
class RoboApplicationTest extends Specification {

    @Autowired
    ApplicationContext context

    @SpringBean
    GpioController gpioController = Stub()

    def "test context loads"() {
        given:
        gpioController.provisionDigitalInputPin(_, _, _) >> { throw new RuntimeException("I'm stubbed!") }

        expect:
        context != null
        context.containsBean('gpioController')
    }
}

您可以在下面找到整个应用程序:https://github.com/ahlinist/raspberry-pi4j/tree/feature/integration-tests

我试图实现以下描述的结果：https://github.com/spockframework/spock/blob/master/spock-spring/boot-test/src/test/groovy/org/spockframework/boot/springbeanintegrationspec.groovy

我试过很多方法都没有结果。用Mockito进行类似的测试效果很好。我错过了什么？

./gradlew integrationTest

Answer 1

当我克隆你的项目并运行测试时，我还会看到一个NPE，······

java.lang.IllegalStateException: Failed to execute ApplicationRunner
    at org.springframework.boot.SpringApplication.callRunner(SpringApplication.java:778) ~[spring-boot-2.2.2.RELEASE.jar:2.2.2.RELEASE]
    (...)
Caused by: java.lang.NullPointerException: null
    at robot.controller.impl.RaspberryPiInputImpl.addListener(RaspberryPiInputImpl.java:19) ~[main/:na]
    at robot.sensor.AbstractSensor.init(AbstractSensor.java:21) ~[main/:na]
    at robot.TwoWheelRobot.init(TwoWheelRobot.java:20) ~[main/:na]
    at robot.RoboApplication.run(RoboApplication.java:26) ~[main/:na]
    at org.springframework.boot.SpringApplication.callRunner(SpringApplication.java:775) ~[spring-boot-2.2.2.RELEASE.jar:2.2.2.RELEASE]
    ... 61 common frames omitted

...但不是在你的测试中而是在这堂课上：

package robot.controller.impl;

import com.pi4j.io.gpio.GpioPinDigitalInput;
import com.pi4j.io.gpio.event.GpioPinListenerDigital;
import lombok.RequiredArgsConstructor;
import robot.controller.Input;
import robot.controller.Listener;

@RequiredArgsConstructor
public class RaspberryPiInputImpl implements Input {

    private final GpioPinDigitalInput gpioPinDigitalInput;

    @Override
    public void addListener(Listener listener) {
        GpioPinListenerDigital gpioListener = (GpioPinListenerDigital) listener;
        gpioPinDigitalInput.addListener(gpioListener);
    }
}

您有一个最后的GPIOPIndigitalInput字段，该字段永远不会初始化，即始终为NULL。那么，在调用AddListener(..)时，除了NPE之外，您还期望什么呢？也许你应该在那里注入一个值...