java - 使用 powermockito 模拟 URL 类时出现问题

Question

无需深入了解这样做的优点，只需要帮助弄清楚为什么以下测试代码不起作用!在这一点上，这更像是一种学习练习。

只是尝试使用 PowerMockito 为 URL 类创建模拟，并为其定义一些行为。这是代码:

package com.icidigital.services

import com.icidigital.services.impl.WeatherServiceImpl
import org.junit.Before
import org.junit.Test
import org.junit.runner.RunWith
import org.powermock.api.mockito.PowerMockito
import org.powermock.core.classloader.annotations.PrepareForTest
import org.powermock.modules.junit4.PowerMockRunner


/**
 * Created by apil.tamang on 7/27/15.
 * I could not get the setup to finish! Failed!
 */
@PrepareForTest(URL.class)
@RunWith(PowerMockRunner.class)
class WeatherServiceImplTest {


    URL mockURL;
    URLConnection mockConn;

    @Before
    public void setUp(){

        byte[] data = "123,456".getBytes();

        InputStream input = new ByteArrayInputStream(data);

        //define and set behavior for mockConn
        mockConn=PowerMockito.mock(HttpURLConnection.class);
        //Mockito.doCallRealMethod().when(mockConn).getResponseCode();
        //Mockito.when(mockConn.getResponseCode()).thenCallRealMethod().thenReturn(200);
        //Mockito.when(mockConn.getInputStream()).thenReturn(input);

        //define and set behavior for mockURLObj
        mockURL=PowerMockito.mock(URL.class);
        PowerMockito.when(mockURL.openConnection()).thenReturn(mockConn);


    }

    @Test
    public void testSetup(){

        WeatherServiceImpl testObj=new WeatherServiceImpl(mockURL);
        String response=testObj.run("foobar");
        PowerMockito.verifyNew(mockURL);





    }

}

抛出以下异常堆栈。特别是，这个测试的链接 39，我有: PowerMockito.when(mockURL.openConnection()).thenReturn(mockConn);抛出错误。请注意，URL 是最后一类，我正在使用 Powermockito。

java.lang.AbstractMethodError
    at java.net.URL.openConnection(URL.java:971)
    at java_net_URL$openConnection.call(Unknown Source)
    at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:45)
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:108)
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:112)
    at com.icidigital.services.WeatherServiceImplTest.setUp(WeatherServiceImplTest.groovy:39)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at org.junit.internal.runners.MethodRoadie.runBefores(MethodRoadie.java:129)
    at org.junit.internal.runners.MethodRoadie.runBeforesThenTestThenAfters(MethodRoadie.java:93)

Answer 1

嗯，这不完全是一个解决方案，我现在只是解决了一个不同的错误，但至少烦人的“AbstractMethodError”现在已经消失了。

我所做的是为 prepareClassForTest 注释添加以下类:

....
@PrepareForTest({URL.class, URLConnection.class, WeatherServiceImplTest.class} )
...

有点怀疑，但下面的帖子有点肯定了这个怀疑: powermock puzzler

无论如何，祝我好运。 mock 我的第二天，我一团糟，准备丢球......