Spock模拟私有变量

时间:2018-03-15 17:03:50

标签: groovy mockito spock

我想知道如何使用Groovy / Spock在类中模拟一些私有变量。 假设我们有这个代码:

public class Car {
    private Engine engine;

    public void drive(){
        System.out.println("test");
        if (engine.isState()) {
            // Do something
        } else {
           // Do something
        }
    }
}

在Mockito,我可以写:

@Mock
private Engine engine;

@InjectMocks
private Car car = new Car();

@Test
public void drive() {
    when(engine.isState()).thenReturn(true);
    car.drive();
}

但我不知道如何在Spock中做同样的事情。什么是Spock中@InjectMocks的等价物?

2 个答案:

答案 0 :(得分:0)

这更像是一个Groovy而不是一个Spock问题。在Groovy中,您只需调用一个命名私有成员的构造函数,然后注入它。但这很难看,你应该通过依赖注入来重构可测试性,正如Tim Yates已经说过的那样。但是对于它的价值,这里是你可以(但不应该)这样做的方式:

package de.scrum_master.stackoverflow;

public class Engine {
  private boolean state;

  public boolean isState() {
    return state;
  }
}
package de.scrum_master.stackoverflow;

public class Car {
  private Engine engine;

  public void drive(){
    System.out.println("driving");
    if(engine.isState()) {
      System.out.println("true state");
    } else {
      System.out.println("false state");
    }
  }
}
package de.scrum_master.stackoverflow

import spock.lang.Specification

class CarTest extends Specification {
  def "Default engine state"() {
    given:
    def engine = Mock(Engine)
    def car = new Car(engine: engine)

    when:
    car.drive()

    then:
    true
  }

  def "Changed engine state"() {
    given:
    def engine = Mock(Engine) {
      isState() >> true
    }
    def car = new Car(engine: engine)

    when:
    car.drive()

    then:
    true
  }
}

BTW,then: true是因为您的方法返回void,我不知道您要检查哪些其他内容。

测试为绿色,控制台日志如下所示:

driving
false state
driving
true state

答案 1 :(得分:0)

我建议在制造Engine时将其放入汽车中

public class Car {
    private final Engine engine;

    public Car(final Engine engine) {
        this.engine = engine
    }

    // ...
}

然后,您可以使用JUnit像这样在示例中模拟引擎:

@Mock
private Engine engine;

private Car car = new Car(engine);

@Test
public void drive() {
    when(engine.isState()).thenReturn(true);
    car.drive();
}

或使用Spock:

private Engine engine = Mock();

private Car car = new Car(engine);

def "test drive"() {
    given:
    engine.isState() >> true

    expect:
    car.drive();
}