You can try as follows; @Injectable will automatically inject the mock Logger object to the constructor when initializing your tested class.
import mockit.Injectable;
import mockit.Tested;
...
@Tested
HuronClassloader loader;
@Injectable
Logger logger;
@Test
public void testSomeMethod() {
//Optionally you can set expectation on your mock
new Expectations() {{
logger.someMethod(); result = ...;
}};
loader.doLogic();
}