1. mock私有方法

待测试类

public class Demo {public void publicMethod() {System.out.println("public method invoke");protectedMethod("str");privateMethodA();privateMethodB();System.out.println("public method end");}protected void protectedMethod(String str) {System.out.println("protected method invoke");System.out.println("protected method end");}private void privateMethodA() {System.out.println("private methodA invoke");System.out.println("private methodA end");}private String privateMethodB() {System.out.println("private methodB invoke");System.out.println("private methodB end");return "privateMethodB";}
}

测试类

import com.lianlian.cbfin.credit.mng.controller.Demo;
import org.junit.Before;
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 static org.mockito.Matchers.any;@RunWith(PowerMockRunner.class)
@PrepareForTest({Demo.class}) // 需要mock私有方法的类，必须要加这个！！！否则mock不生效且有一些奇奇怪怪的问题
public class DemoTest {private Demo demo;@Beforepublic void init() throws Exception {demo = PowerMockito.spy(new Demo()); // spy：demo对象的方法会被真实调用，除非指定mock了一些内容，例如下面被mock的方法
//        demo = PowerMockito.mock(Demo.class); // mock：demo对象的方法都会被mock，不会真实调用PowerMockito.doNothing().when(demo, "protectedMethod", any());PowerMockito.doNothing().when(demo, "privateMethodA");PowerMockito.doReturn("123").when(demo, "privateMethodB");}@Testpublic void publicMethod(){demo.publicMethod();}
}

运行结果

public method invoke
public method end

2. mock静态方法

待测试类

public class Demo {public void demoMethod() {System.out.println("demo method invoke");privateStaticMethod();StaticClass.publicStatic();System.out.println("demo method end");}private static String privateStaticMethod(){System.err.println("privateStatic method invoke");return null;}
}

静态方法提供类

public class StaticClass {public static void publicStatic(){System.out.println("publicStatic method invoke");}
}

测试类-未正确mock

import com.lianlian.cbfin.credit.mng.controller.Demo;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.powermock.api.mockito.PowerMockito;
import org.powermock.modules.junit4.PowerMockRunner;@RunWith(PowerMockRunner.class)
public class DemoTest {private Demo demo;@Beforepublic void init() throws Exception {demo = PowerMockito.spy(new Demo());}@Testpublic void demoMethod(){demo.demoMethod();}
}

mock前运行结果

demo method invoke
privateStatic method invoke
publicStatic method invoke
demo method end

测试类-正确mock

import com.lianlian.cbfin.credit.mng.controller.Demo;
import com.lianlian.cbfin.credit.mng.controller.StaticClass;
import org.junit.Before;
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;@RunWith(PowerMockRunner.class)
@PrepareForTest({Demo.class, StaticClass.class}) // 需要mock静态方法的类；这个@PrepareForTest可以当作Mockito的增强版，需要mock私有方法或者静态方法，就加上这个注解
public class DemoTest {private Demo demo;@Beforepublic void init() throws Exception {demo = PowerMockito.spy(new Demo());}@Testpublic void demoMethod() throws Exception {PowerMockito.mockStatic(StaticClass.class);PowerMockito.mockStatic(Demo.class);PowerMockito.when(Demo.class, "privateStaticMethod").thenReturn("mock privateStaticMethod"); // 私有静态方法正确的mock方法；私有静态方法也是静态方法
//        PowerMockito.doReturn("mock privateStaticMethod").when(demo, "privateStaticMethod"); // 私有静态方法错误的mock方法，不能当成私有方法mockdemo.demoMethod();}
}

正确mock后运行结果

demo method invoke
demo method end