Fighter.java

package zl.ca.test;

public class Fighter extends Person {
  private int power;

  public Fighter(String name, int age) {
    super(name, age);
  }

  public int getPower() {
    return power;
  }

  public void setPower(int power) {
    this.power = power;
  }
}

GameController.java

package zl.ca.test;

public class GameController {
  public void twoPersonFight(String name1, String name2, int age1, int age2){
    Person p1 = PersonFactory.createPerson(name1, age1);
    Person p2 = PersonFactory.createPerson(name2, age2);
    Fighter f1 = PersonFactory.createFighter(p1);
    Fighter f2= PersonFactory.createFighter(p2);
    fight(f1, f2);
  }
  
  public void fight(Fighter...  fighters){
    //todo
  }
}

GameControllerTest.java

package zl.ca.test;

import org.hamcrest.Matchers;
import org.junit.Test;

import mockit.Expectations;
import mockit.Mocked;
import mockit.Tested;
import mockit.Verifications;

public class GameControllerTest {

  @Tested
  GameController gameController;
  @Mocked
  PersonFactory factoryNotInUse;

  @Test
  public void testCreatPerson() {
    String name1 = "John";
    int age1 = 20;
    String name2 = "Dan";
    int age2 = 30;
    new Expectations() {
      {
        Person person1 = new Person(name1, age1);
        Person person2 = new Person(name2, age2);

        PersonFactory.createPerson(name1, age1);
        result = person1;
        times = 1;
        PersonFactory.createPerson(name2, age2);
        result = person2;
        times = 1;

        PersonFactory.createFighter(person1);
        times = 1;
        PersonFactory.createFighter(person2);
        times = 1;
      }
    };
    gameController.twoPersonFight(name1, name2, age1, age2);
    new Verifications() {
      {
        PersonFactory.createFighter(withArgThat(
            Matchers.allOf(Matchers.<Person>hasProperty("name", Matchers.equalTo(name1)),
                Matchers.hasProperty("age", Matchers.equalTo(age1)))));
        times = 1;
        PersonFactory.createFighter(withArgThat(
            Matchers.allOf(Matchers.<Person>hasProperty("name", Matchers.equalTo(name2)),
                Matchers.hasProperty("age", Matchers.equalTo(age2)))));
        times = 1;
      }
    };
  }
}

Person.java

package zl.ca.test;

public class Person {
  private String name;
  private int age;
  public Person(String name, int age){
    this.name=name;
    this.age=age;
  }
  public String getName() {
    return name;
  }
  public void setName(String name) {
    this.name = name;
  }
  public int getAge() {
    return age;
  }
  public void setAge(int age) {
    this.age = age;
  }
}

PersonFactory.java

package zl.ca.test;

public class PersonFactory {
  public static Person createPerson(String name, int age){
    Person p = new Person(name, age);
    return p;
 }
  
  public static Fighter createFighter(Person person ){
    Fighter fighter = new Fighter(person.getName(), person.getAge());
    fighter.setPower(100);
    return fighter;
  }
}

This gist is to demonstrate how to use Hamcrest matchers with JMockit.