`public class AnotherThing {
  private final Something something;

  public AnotherThing(Something something) {
    this.something = something;
  }

  public void doSomething (String s) {
    something.send(s);
  }
}

public class Something {

  void send(String s) throws IOException{

  }

  void send(int i) throws IOException{

  }
}

import static org.mockito.Matchers.anyString;
import static org.mockito.Mockito.doThrow;
import static org.mockito.Mockito.mock;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.mockito.runners.MockitoJUnitRunner;

@RunWith(MockitoJUnitRunner.class)
public class OverloadedTest {

  @Test(expected = IllegalStateException.class)
  public void testDoSomething() throws Exception {
    final Something mock = mock(Something.class);
    final AnotherThing anotherThing = new AnotherThing(mock);

    doThrow(new IllegalStateException("failed")).when(anotherThing.doSomething(anyString()));
  }
}`