如何使用PowerMockito和JUnit模拟getResourceAsStream方法?

本文介绍了如何使用PowerMockito和JUnit模拟getResourceAsStream方法?的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我尝试模拟在构造函数中调用的getResourceAsStream方法.

I try to mock getResourceAsStream method which I invoke in constructor.

public Conn() { stream = Conn.class.getClass().getResourceAsStream(PATH); }

对于模拟框架，我更喜欢Mockito + PowerMockito.

For mock framework I prefer Mockito + PowerMockito.

@RunWith(PowerMockRunner.class) @PrepareForTest(Conn.class) public class ConnTest { @Mock private InputStream streamMock; private Conn conn; @Before public void before() { initMocks(this); } @Test public void test() { PowerMockito.mockStatic(Conn.class); PowerMockito.when(Connector.class.getResourceAsStream("/prop.properties")).thenReturn(streamMock); conn = new Conn(); } @After public void after() { reset(streamMock); } }

但是方法thenReturn不返回模拟.我该如何解决?

But method thenReturn doesn't return a mock. How can I fix it?

推荐答案

您可以执行以下操作:

@RunWith(PowerMockRunner.class) @PrepareForTest(Class.class) public class ConnTest { @Mock private InputStream streamMock; private Conn conn; @Before public void before() { initMocks(this); } @Test public void test() { PowerMockito.mockStatic(Class.class); PowerMockito.when(Connector.class.getClass().getResourceAsStream("/prop.properties")).thenReturn(streamMock); conn = new Conn(); } @After public void after() { reset(streamMock); } }

在这里，您将资源放在类对象的顶部，这就是为什么Class.class您需要通过使用@PrepareForTest(Class.class)和PowerMockito.mockStatic(Class.class);准备测试的原因.

Here you are stubbing resource on top of a class object, that is why Class.class you need to prepare for test by using @PrepareForTest(Class.class) and PowerMockito.mockStatic(Class.class);.

我不确定它是否对构造函数有效，但是对于调用getClass.getResourceAsStream("anyString")的方法来说，它工作正常(我已经测试过).

I am not sure whether it'll work for constructor or not but for a method which is calling getClass.getResourceAsStream("anyString") it's working fine(I have tested).