JMockit Mocking java.net.URL causes test not run

Question

I'm using the newest versions of junit and jmockit and Oracle JDK 7 in Eclipse. When I try to mock java.net.URL my test won't run.

I have in my code something like:

URL url = new URL("String representing the url.");

So I figured in my test I could mock this like so:

@Mocked private URL _url;

Since this works for pretty much everything else, I know URL is final but I thought that was okay with JMockit.

When I run a test class with the above mock in eclipse the result is a grey line(as opposed to green or red.) So I'm assuming some kind of initialization problem. The rest of the test or code doesn't seem to matter, no matter what I put that @Mocked line in, this happens.

A workaround would be great, an explanation of what is actually causing this would be even better. Any help is definitely appreciated! Thanks!

Quick example. This actually gives an exception, but I think it is basically doing the same thing I have seen:

package demo;

import java.io.IOException;
import java.net.HttpURLConnection;
import java.net.URL;

public class Connecting {
    public boolean connectionattempt() throws IOException {
    URL url = new URL("http://nowhere/");
    HttpURLConnection connection = (HttpURLConnection) url.openConnection();
        if (connection != null) {
            return true;
        }
        else {
            return false;
        }
    }
}

And this test:

package demo;

import static org.junit.Assert.assertEquals;

import java.io.IOException;
import java.net.HttpURLConnection;
import java.net.URL;

import org.junit.Test;
import mockit.Expectations;
import mockit.Mocked;
import mockit.Tested;

public class TestConnecting {
    @Mocked URL _url;
    @Mocked HttpURLConnection _connection;
    @Tested Connecting _sut;

    @Test
    public void testConnect() throws IOException {
        new Expectations() { {
            _url.openConnection(); result = _connection;
        } };
        assertEquals(true, _sut.connectionattempt());
    }
}

and the stack trace:

java.lang.NoClassDefFoundError: org/eclipse/jdt/internal/junit/runner/TestReferenceFailure
    at org.eclipse.jdt.internal.junit4.runner.JUnit4TestListener.testFailure(JUnit4TestListener.java:91)
    at org.eclipse.jdt.internal.junit4.runner.JUnit4TestListener.testFailure(JUnit4TestListener.java:69)
    at org.junit.runner.notification.RunNotifier$4.notifyListener(RunNotifier.java:139)
    at org.junit.runner.notification.RunNotifier$SafeNotifier.run(RunNotifier.java:61)
    at org.junit.runner.notification.RunNotifier.fireTestFailures(RunNotifier.java:134)
    at org.junit.runner.notification.RunNotifier.fireTestFailure(RunNotifier.java:128)
    at org.junit.internal.runners.model.EachTestNotifier.addFailure(EachTestNotifier.java:23)
    at org.junit.runners.ParentRunner.run(ParentRunner.java:315)
    at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
    at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:459)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:675)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:382)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:192)

Answer 1

I executed the test on Eclipse Kepler SR2, IntelliJ IDEA 13.1, and Netbeans 8.0.1, using JMockit 1.13, JUnit 4.11, and Oracle JDK 1.7.0_67.

The test passes in every case, it's all green! So, I don't know what could possibly be the problem in your environment. Are you sure the "newest version" of JMockit (1.13 at this time) was the one actually used?