VerifyError using Mockito 1.9.5 and DexMaker-Mockito-1.0

Question

Like many others I was excited to hear that Mockito now works with Android and followed this tutorial to see it with my own eyes. Everything seemed fan-flapping-tastic and I

Answer 1

We just had the same problem in a project, but our tests also failed on a real device.

The cause was tracked to how Mockito uses the class loader, and resulted in the following error in LogCat:

W/ActivityThread(5777): ClassLoader.getResources: The class loader returned by Thread.getContextClassLoader() may fail for processes that host multiple applications. You should explicitly specify a context class loader. For example: Thread.setContextClassLoader(getClass().getClassLoader());

The fix was to explicitly set the class loader before calling mock() a test, eg.

@Override
protected void setUp() throws Exception {
    super.setUp();
    Thread.currentThread().setContextClassLoader(getClass().getClassLoader());
    fooImpl = mock(Foo.class)
}

The problematic file in Mockito is this one: org.mockito.internal.configuration.ClassPathLoader (line 121 in 1.9.5)