EasyMock 3.0, mocking class throws java.lang.IllegalStateException: no last call on a mock available

Question

Running the following unit test throws the exception: java.lang.IllegalStateException: no last call on a mock available

import org.easymock.*;
import org.ju         


        

Answer 1

The reason for this exception is that Thread#isAlive() is a final method, but EasyMock does not support the mocking of final methods. So, the call to this method which appears inside EasyMock.expect(...) is not seen as a "call on a mock".

To mock final methods you would need a different mocking tool, such as JMockit (which I develop):

public void testMockingFinalMethod(@Mocked("isAlive") Thread mock)
{
    new Expectations()
    {{
        mock.isAlive(); result = true;
    }};

    assertTrue(mock.isAlive());
}

The mocking API doesn't actually require that methods to be mocked are specified explicitly, in the general case. The Thread class is a tricky one, though.