Problems PowerMocking URL with JUnit 4.8.1 and PowerMock 3.7.1

[remotenemesis]

I'm having trouble PowerMocking a URl in a test case. I end up getting
a NullPointerException inside java.net.URL.openConnection() which is
being called from java.net.URL.openStream() which is the actual method
I am calling in the URLThing::do() below. It looks like URL is not
being mocked.

Any advice?

Thanks!

Andy

import static org.powermock.api.easymock.PowerMock.expectLastCall;
import static org.powermock.api.easymock.PowerMock.createMock;
import static org.powermock.api.easymock.PowerMock.replay;
import static org.powermock.api.easymock.PowerMock.verify;

import java.io.IOException;
import java.io.InputStream;
import java.net.MalformedURLException;
import java.net.URL;

import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.powermock.core.classloader.annotations.PrepareForTest;
import org.powermock.modules.junit4.PowerMockRunner;

@PrepareForTest(URL.class)
@RunWith(PowerMockRunner.class)
public class URLThingTest {

private URL url;

private InputStream inputStream;

@Before
public void setUp() throws MalformedURLException {
url = createMock(URL.class);
inputStream = createMock(InputStream.class);
}

@Test
public void theBadTest() throws IOException {

url.openStream();
expectLastCall().andReturn(inputStream);

inputStream.close();
expectLastCall().once();

replay(url, inputStream);

final String digest = new URLThing().do(url);

verify(url, inputStream);
}

}

[Johan Haleby]

Hi,

The reason is that URL is a system class and cannot be byte-code manipulated. System classes must be dealt with in a special way, i.e. you prepare the class using the system class and not the system class itself. In your case you should probably prepare URLThing.class for test instead of URL.class. See documentation.

/Johan

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[Andy Hull]

Ah I understand. Works perfectly... (as if by magic!). Thanks for your help.

-Andy

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[Johan Haleby]

Great :)