模拟 DoNothing 类的私有 void 方法 - 使用 PowerMockito答案

【问题标题】：Mocking DoNothing a private void method of a class - using PowerMockito模拟 DoNothing 类的私有 void 方法 - 使用 PowerMockito
【发布时间】：2020-10-17 03:30:55
【问题描述】：

公共方法一个类正在被测试并且在公共方法内部它调用一个私有方法。我想在调用私有方法时忽略(doNothing)。

 Myclass{

    public void someMethod( String some, File file, long age ,String name ){
        -----somecode----
        callprivateMethod(File file, long age, String name); //want to mock and Donothing
        -----somecode----
    }
}

已完成以下操作

@RunWith(PowerMockRunner.class)
@PrepareForTest({Ignorethisclass.class,MyClass.class})
MyClass iMyClass= Mockito.spy(new MyClass());

以下代码给出空指针异常：

[0]org.powermock.api.mockito.internal.expectation.PowerMockitoStubberImpl.addAnswersForStubbing(PowerMockitoStubberImpl.java:65) StackTraceElement

doNothing().when(iMyClass, PowerMockito.method(MyClass.class, "callprivateMethod")).withArguments(Mockito.any(File.class),Mockito.any(long.class),Mockito.any(String.class));

我也试过这个，因为我在某个地方读到这样做下面的代码给出了一个空指针异常

doNothing().when(iMyClass, "callprivateMethod", Mockito.any(File.class),Mockito.any(Long.class),Mockito.any(String.class));

非常感谢任何帮助

【问题讨论】：

也试过这个：'PowerMockito.doNothing().when(MyClass, PowerMockito.method(MyClass.class, "callprivateMethod",File.class,long.class,String.class)).withArguments (Mockito.any(File.class),Mockito.any(long.class),Mockito.any(String.class));' '[0] org.powermock.api.mockito.internal.expectation.PowerMockitoStubberImpl.addAnswersForStubbing(PowerMockitoStubberImpl.java:65) StackTraceElement'

标签： java methods mocking mockito powermockito

【解决方案1】：

您需要使用 powermock 模拟“MyClass”：

MyClass iMyClass = PowerMockito.spy(new MyClass());

完整示例：

//MyClass.java
import java.io.File;

public class MyClass {
    private void callprivateMethod(File file, long age, String name){
        throw new RuntimeException("avoid!");
    }

    public void someMethod(String some, File file, long age , String name ){
        System.out.println("-----somecode----");
        callprivateMethod(file, age, name);
        System.out.println("-----somecode----");
    }

}


//MyClassTest.java
import org.junit.Test;
import org.junit.runner.RunWith;
import org.powermock.api.mockito.PowerMockito;
import org.powermock.core.classloader.annotations.PrepareForTest;
import org.powermock.modules.junit4.PowerMockRunner;

import java.io.File;

import static org.mockito.ArgumentMatchers.any;
import static org.powermock.api.mockito.PowerMockito.doNothing;

@RunWith(PowerMockRunner.class)
@PrepareForTest({MyClass.class})
public class MyClassTest {
    @Test
    public void someMethod() throws Exception {
        MyClass iMyClass = PowerMockito.spy(new MyClass());
        doNothing().when(iMyClass, "callprivateMethod", any(File.class), any(Long.class), any(String.class));
        iMyClass.someMethod("some", new File(""),22,"name");
    }
}

将输出：

-----somecode----
-----somecode----

【讨论】：