如何模拟 void 静态方法以使用 Powermock 引发异常

问题描述

我正在尝试使用 Powermock 和 Mockito 来模拟 void 静态方法来抛出异常，如下所示.但是我遇到了一个问题.除非我使用相同的参数对 Adder.add() 进行两次调用，否则不会抛出模拟的 IOException.

I am trying to use Powermock and Mockito to mock a void static method to throw exception as below. But I met a problem. Unless I make the two invocations of Adder.add() with the same argument, the mocked IOException won't be thrown.

顺便说一句，我已将 @RunWith(PowerMockRunner.class) 和 @PrepareForTest(Adder.class) 添加到单元测试类中.

BTW, I've added @RunWith(PowerMockRunner.class) and @PrepareForTest(Adder.class) to the unit test class.

class Adder{
    public static void add(int i) throws IOException{
        return;
    }
}

@Test
public void testAdder() throws IOException{
    PowerMockito.mockStatic(Adder.class);
    PowerMockito.doThrow(new IOException()).when(Adder.class);
    Adder.add(12);
    try {
        Adder.add(11);
    } catch (Exception e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
    // assert things 
}

提前致谢.:)

答案如下.

在这里咨询后http://code.google.com/p/powermock/issues/detail?id=278 ，其实上面的 Adder.add(12) 就是设置 mock 静态方法的一部分.这意味着当使用参数 12 调用 Adder.add() 时，将抛出 IOException.这很难理解，对吧?:) 所以应该写成下面这样.

After consulting here http://code.google.com/p/powermock/issues/detail?id=278 , in fact Adder.add(12) above is part of setting up mock static method. It means when invoking Adder.add() with argument 12, IOException will be thrown. It is hard to understand, right? :) So it should be written as below.

PowerMockito.mockStatic(Adder.class);
PowerMockito.doThrow(new IOException()).when(Adder.class);
Adder.add(anyInt());

推荐答案

答案如下.

在这里咨询后http://code.google.com/p/powermock/issues/detail?id=278 ，其实上面的 Adder.add(12) 就是设置 mock 静态方法的一部分.这意味着当使用参数 12 调用 Adder.add() 时，将抛出 IOException.这很难理解，对吧?:) 所以应该写成下面这样.

After consulting here http://code.google.com/p/powermock/issues/detail?id=278 , in fact Adder.add(12) above is part of setting up mock static method. It means when invoking Adder.add() with argument 12, IOException will be thrown. It is hard to understand, right? :) So it should be written as below.

PowerMockito.mockStatic(Adder.class);
PowerMockito.doThrow(new IOException()).when(Adder.class);
Adder.add(anyInt());

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