我不确定如何模拟枚举单例类。
public enum SingletonObject{
INSTANCE;
private int num;
protected setNum(int num) {
this.num = num;
}
public int getNum() {
return num;
}
我想在上面的例子中存根getNum(),但是我不知道如何模拟实际的SingletonObject类。我认为使用Powermock来准备测试会有所帮助,因为枚举本质上是最终的。
//... rest of test code
@Test
public void test() {
PowerMockito.mock(SingletonObject.class);
when(SingletonObject.INSTANCE.getNum()).thenReturn(1); //does not work
}
这是使用PowerMockMockito 1.4.10和Mockito 1.8.5。
发布于 2013-05-23 03:26:36
如果你想存根出实例返回的内容,你可以这样做,但这有点麻烦(使用反射和字节码操作)。我使用PowerMock 1.4.12 / Mockito 1.9.0创建并测试了一个包含三个类的简单项目。所有的类都在同一个包中。
SingletonObject.java
public enum SingletonObject {
INSTANCE;
private int num;
protected void setNum(int num) {
this.num = num;
}
public int getNum() {
return num;
}
}
SingletonConsumer.java
public class SingletonConsumer {
public String consumeSingletonObject() {
return String.valueOf(SingletonObject.INSTANCE.getNum());
}
}
SingletonConsumerTest.java
import static org.junit.Assert.*;
import static org.powermock.api.mockito.PowerMockito.*;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.powermock.core.classloader.annotations.PrepareForTest;
import org.powermock.modules.junit4.PowerMockRunner;
import org.powermock.reflect.Whitebox;
@RunWith(PowerMockRunner.class)
@PrepareForTest({SingletonObject.class})
public class SingletonConsumerTest {
@Test
public void testConsumeSingletonObject() throws Exception {
SingletonObject mockInstance = mock(SingletonObject.class);
Whitebox.setInternalState(SingletonObject.class, "INSTANCE", mockInstance);
when(mockInstance.getNum()).thenReturn(42);
assertEquals("42", new SingletonConsumer().consumeSingletonObject());
}
}
对Whitebox.setInternalState
的调用将INSTANCE
替换为您可以在测试中操作的模拟对象。
发布于 2019-05-05 02:52:27
具有与您打算模拟的方法的接口
public interface SingletonInterface {
int getNum();
}
让枚举实现接口
public enum SingletonObject implements SingletonInterface {
INSTANCE;
private int num;
protected void setNum(int num) {
this.num = num;
}
@Override
public int getNum() {
return num;
}
}
模拟接口
@Test
public void test() {
SingletonInterface singleton = Mockito.mock(SingletonInterface.class);
when(singleton.getNum()).thenReturn(1); //does work
}
发布于 2020-06-15 20:24:08
除了上面Matt Lachman回答之外,在SingleTonConsumerTest.class
中为power模拟创建一个对象工厂
@ObjectFactory
public IObjectFactory getObjectFactory() {
return new org.powermock.modules.testng.PowerMockObjectFactory();
}
这将删除Mockito cannot mock/spy following: - final classes - anonymous classes - primitive types
错误。
https://stackoverflow.com/questions/15939023
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