I'm trying to use PowerMockito to mock some static methods in Android Robolectric tests. I'm using JUnit 4.8.2, Robolectric 2.2, Mockito 1.9.5, and PowerMock 1.9.5 as directed here. As I have to use the RoboElectricTestRunner, I'm attempting to use the PowerMockRule to bootstrap PowerMock. However I'm getting an unfortunate java.lang.IncompatibleClassChangeError
when the test with PowerMock runs.
java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597)
at sun.instrument.InstrumentationImpl.loadClassAndStartAgent(InstrumentationImpl.java:323) at sun.instrument.InstrumentationImpl.loadClassAndCallAgentmain(InstrumentationImpl.java:348)Caused by: java.lang.IncompatibleClassChangeError: Implementing class at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClassCond(ClassLoader.java:637) at java.lang.ClassLoader.defineClass(ClassLoader.java:621) at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141)
If I put org.ow2.asm
after the org.powermock
libraries I get:
java.lang.IncompatibleClassChangeError: class org.objectweb.asm.tree.ClassNode has interface org.objectweb.asm.ClassVisitor as super class at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClassCond(ClassLoader.java:637) at java.lang.ClassLoader.defineClass(ClassLoader.java:621) at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141) at java.net.URLClassLoader.defineClass(URLClassLoader.java:283) at java.net.URLClassLoader.access$000(URLClassLoader.java:58) at java.net.URLClassLoader$1.run(URLClassLoader.java:197) at java.security.AccessController.doPrivileged(Native Method)
on every unit test.
According to Maven depency:tree Robolectric and PowerMock don't share any dependencies. But apparently org.powermock:powermock-module-javaagent packages some org/objectweb/asm classes, and Robolectric relies on org.ow2.asm:asm:jar:4.1 causing a conflict.
@RunWith(RobolectricTestRunner.class)
@PrepareForTest(Helper.class)
@PowerMockIgnore({"com.sun.jmx.*", "javax.management.*"})
public class HelpFragTest {
@Rule
public PowerMockRule rule = new PowerMockRule();
static {
PowerMockAgent.initializeIfNeeded();
}
FragmentActivity fragmentActivity;
FragmentManager fragmentManager;
ActionBarManager actionBarManager;
@Before
public void setup(){
actionBarManager = mock(ActionBarManager.class);
LowesApplication.instance().setActionBarManager(actionBarManager);
fragmentActivity = Robolectric.buildActivity(FragmentActivity.class).create().start().resume().get();
fragmentManager = fragmentActivity.getSupportFragmentManager();
}
@Test
public void testShow(){
mockStatic(Helper.class);
HelpFrag helpFrag = HelpFrag.newInstance();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
fragmentTransaction.add(helpFrag, null);
fragmentTransaction.commit();
assertTrue(helpFrag.isVisible());
}
}
I found a way to use PowerMock in conjunction with Robolectric.
In addition to the standard PowerMock jars, the PowerMock Junit Rule is also needed. It is described here how to grab it. I used the
xstream
classloading version, because theobjenesis
one is very buggy. This is working with PowerMock 1.5.5 and Robolectric 2.3, i cannot speak about the older versions. Also please note that the Java agent should not be included, because from my experience it causes problems.So if you are using maven, these dependencies should be declared:
Then you have to setup your test class like this: