Powermock constructor mocking has no effect on the instantiated object

问题

    Class  A{

    B objB = new B();
    objB.someBMethod();

    }

    Class B{

    public void someBMethof(){

    C objC = new C();

    }
    }

    class C{
    int a=1;
    public C(){}
    public C(int v){
    a=v;
    }
    }

@RunWith( PoswerMockRunner.class )
@PrepareForTest({ A.class, B.class, C.class})
Class TestApp{

    @Mock
    C mockC;

    PowerMockito.whenNew( C.class ).withNoArguments().thenReturn(mockC);

}

The above code captures what im trying to do. But the whenNew() does not seem to be working and when i try debuggin the C object created is not the mock. Dont know whats happening. Some pointers would be much appreciated. thanks

回答1:

You provides some code, so thanks. But the next time, consider to post an sscce (Correct (Compilable) example).

I tried (and fix your code) and it works. This is my version of your code :

public class A {

    public int someAMethod() {
        B objB = new B();
        return objB.someBMethod();
    }
}

public class B {

    public int someBMethod() {
        C objC = new C();
        return objC.getA();
    }
}

import static org.junit.Assert.assertEquals;
import static org.mockito.Mockito.when;

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

@RunWith(PowerMockRunner.class)
@PrepareForTest({ A.class, B.class, C.class })
public class TestApp {

    @Mock
    C mockC;

    @Test
    public void shoudlReturnTheCValue() throws Exception {
        when(mockC.getA()).thenReturn(666);
        PowerMockito.whenNew(C.class).withNoArguments().thenReturn(mockC);
        assertEquals(666, new A().someAMethod());
    }
}

I have configured a maven project with the following dependencies :

<dependency>
    <groupId>org.powermock</groupId>
    <artifactId>powermock-api-mockito</artifactId>
    <version>1.5</version>
    <scope>test</scope>
</dependency>
<dependency>
    <groupId>org.powermock</groupId>
    <artifactId>powermock-module-junit4</artifactId>
    <version>1.5</version>
    <scope>test</scope>
</dependency>
<dependency>
    <groupId>junit</groupId>
    <artifactId>junit</artifactId>
    <version>4.11</version>
    <scope>test</scope>
</dependency>
<dependency>
    <groupId>org.mockito</groupId>
    <artifactId>mockito-all</artifactId>
    <version>1.9.5</version>
    <scope>test</scope>
</dependency>

来源：https://stackoverflow.com/questions/15374928/powermock-constructor-mocking-has-no-effect-on-the-instantiated-object

标签

java

junit

mockito

stub

powermock