@RunWith(PowerMockRunner.class)

@PrepareForTest(Helper.class)//1.添加要初始化的类,就是构造函数所在的类

public class HelperTest {

  @Mock

  private Something mockSomething;

      

  @InjectMocks

  private Helper helper;

      

  @Test

  public void doSomething() throws Exception {

      String argument = "arg";

          

      PowerMockito.whenNew(Something.class).withArguments(argument).thenReturn(mockSomething);//2.添加要构造的函数的类,参数和返回值

          

      // 3.调用需要测试方法

      helper.doSomething(argument);

          

      // 进行验证

      verify(mockSomething).doIt();

  }

}

public class Helper ｛

  public void doSomething(String arg) {

      Something something = new Something(arg);

      something.doit();

  }

}

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