原文链接：https://www.cnblogs.com/changzhz/p/5163562.html

mock中测试private方法,不是mock: 

Method method = PowerMockito.method(CategoryController.class, "getCategory",List.class);//创建调用CategoryController类中的getCategory私有方法的method对象,参数是list对象
List<Category> category_all_actual = (List<Category>)method.invoke(categoryController, categories);//调用categoryController的私有方法,返回list对象,参数是list对象
assertArrayEquals(category_all_expect.toArray(), category_all_actual.toArray());//比较实际返回的对象与期望的对象是否相等.

或者:// PowerMockito.doReturn(index_expect).when(controller, "processPage", pageCode, request, response, model); // Mock私有方法

或者:// PowerMockito.when(controller, "processPage", pageCode, request, response, model).thenReturn(index_expect); // Mock私有方法

 

 

用PowerMock spy　mock　private方法:

  官方文档: https://github.com/powermock/powermock/wiki/Mockito#how-to-verify-private-behavior

在实际的工作中，经常碰到只需要mock一个类的一部分方法，这时候可以用spy来实现。

被测类：

 

public class EmployeeService {

    public boolean exist(String userName) {
        checkPrivateExist(userName);
        checkPublicExist(userName);
        return true;
    }

    private void checkPrivateExist(String userName) {
        throw new UnsupportedOperationException();
    }
    
    public void checkPublicExist(String userName){
        throw new UnsupportedOperationException();
    }
}

 

如果要测试exist方法，需要mock　checkPublicExist和checkPrivateExist方法，而不希望mock　exist方法

测试类：

 

@PrepareForTest(EmployeeService.class)
public class EmployeeServiceTestWithPrivateTest  extends PowerMockTestCase{
    
    @ObjectFactory
    public ITestObjectFactory getObjectFactory() {
        return new PowerMockObjectFactory();
    }

    @Test
    public void testExist() {
        try {
            EmployeeService service = PowerMockito.spy(new EmployeeService());
            PowerMockito.doNothing().when(service,"checkPrivateExist","powermock");
            PowerMockito.doNothing().when(service).checkPublicExist("powermock");;
            boolean result = service.exist("powermock");
            Assert.assertTrue(result);
            Mockito.verify(service).checkPublicExist("powermock");
            PowerMockito.verifyPrivate(service).invoke("checkPrivateExist","powermock");
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

}

 

在测试类中，真实的调用了exist方法。

需要注意的是对private方法的mock

PowerMockito.doNothing().when(service,"checkPrivateExist","powermock");

以及对exist方法调用过程的验证

Mockito.verify(service).checkPublicExist("powermock");
PowerMockito.verifyPrivate(service).invoke("checkPrivateExist","powermock");