Mocking external method calls from mock

DefaultOptionPane.java

public class DefaultOptionPane(){
   public String printAwsome() {
        System.out.println("this is awsome");
        return "a";
    }
}

ExcelSupport.java

public class ExcelSupport {
    /**
     * Default constructor
     *
     */
    public ExcelSupport() {}
    
        public void testMethod() {
        DefaultOptionPane optionPane = new DefaultOptionPane();
        System.out.println("Entering method");
        optionPane.printAwsome();
        System.out.println("Exiting Method");
      }
}

ExcelSupportTest.java

import static org.mockito.Mockito.when;
import static org.mockito.Mockito.mock;
import static org.mockito.Matchers.*;
public class ExcelSupportTest{
    @Test
    public void testMethodTest() {

        DefaultOptionPane optionPane = mock(DefaultOptionPane.class);
        when(optionPane.printAwsome()).thenReturn("tada");
        // System.out.println(dp.printAwsome());
        ExcelSupport es2 = new ExcelSupport();
        es2.testMethod();

    }
}