如何使用jMock的Cla​​ssImposteriser进行Android单元测试？

import org.jmock.Mockery;
import org.jmock.Expectations;
import org.jmock.lib.legacy.ClassImposteriser; 

public class MyActivityTest extends ActivityUnitTestCase<MyActivity> {
    private Mockery context = new Mockery() {{
        setImposteriser(ClassImposteriser.INSTANCE);
    }};

    ...
}