junit mockito

package com.zendaimoney.util;

import static org.mockito.Mockito.*;
import static org.junit.Assert.*;
import java.util.Iterator;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.mockito.Mockito;
import org.mockito.runners.MockitoJUnitRunner;

@RunWith(MockitoJUnitRunner.class)
public class Tests {

@Test
public void ss() {
Tests c=mock(Tests.class);
when(c.ss1()).thenReturn("first");
String ss1 = c.ss1();
System.out.println(ss1+"===============");
}

public String ss1() {
System.out.println("ddddd");
return "111111111";
}

public String ss2() {
System.out.println("ssssssssssss");
return "222222222222";
}
}