PowerMock的ExpectNew（）并未按预期嘲笑构造函数

Question

我正在尝试了解各种模拟库的来龙去脉，并且PowerMock（特别是EasyMock扩展名）在列表的后面。我正在尝试模拟构造函数，并且在尝试复制它们时提供的示例没有相同的响应。据我所知，它永远不会嘲笑构造函数，只会像正常一样继续进行。

这是测试类：

@RunWith(PowerMockRunner.class)
@PrepareForTest({Writer.class})
public class FaultInjectionSituationTest {

    @Test
    public void testActionFail() throws Exception {
        FaultInjectionSituation fis = new FaultInjectionSituation();
        PowerMock.expectNew(Writer.class, "test")
           .andThrow(new IOException("thrown from mock"));
        PowerMock.replay(Writer.class);
        System.out.println(fis.action());
        PowerMock.verify(Writer.class);
    }

}

我尝试用EasyMock.isA（String.class）替换“测试”，但结果相同。

这是FaultInjectionSituation：

public class FaultInjectionSituation {

    public String action(){
        Writer w;
        try {
            w = new Writer("test");
        } catch (IOException e) {
            System.out.println("thrown: " + e.getMessage());
            return e.getLocalizedMessage();
        }
        return "returned without throw";
    }
}

“作家”只不过是一个类的外壳：

public class Writer {
    public Writer(String s) throws IOException {
    }

    public Writer() throws IOException{
    }
}

运行测试时，它会打印出“不抛出异常返回”，表明从未抛出异常。

Answer 1

您还需要准备调用构造函数的类，因此PowerMock知道期望模拟构造函数的html" target="_blank">调用。尝试使用以下命令更新代码：

@RunWith(PowerMockRunner.class)
@PrepareForTest({Writer.class, FaultInjectionSituation.class})
public class FaultInjectionSituationTest { 
 // as before
}