代码一样没有报错，但是测试不通过，这个是什么情况

package shiro;
import org.apache.shiro.SecurityUtils;
import org.apache.shiro.authc.UsernamePasswordToken;
import org.apache.shiro.mgt.DefaultSecurityManager;
import org.apache.shiro.realm.SimpleAccountRealm;
import org.apache.shiro.subject.Subject;
import org.junit.Before;import org.junit.Test;
public class shirotest { 
SimpleAccountRealm sar =new SimpleAccountRealm();	
@Before
public void adduser(){	sar.addAccount("wyc", "123456");	  }	
@Test	
public void testshiro(){			
DefaultSecurityManager dsm = new DefaultSecurityManager();		
dsm.setRealm(sar);		
		
SecurityUtils.setSecurityManager(dsm);		
Subject sj = SecurityUtils.getSubject();		
UsernamePasswordToken token = new UsernamePasswordToken("wyc","123456");		
sj.login(token);		
//sj.checkRoles("admin");	
System.out.println(sj.isAuthenticated());	
}}