UserDao：

@IocBean
public class UserDao implements IUserDao {

    @Inject(optional = true)
    protected Dao dao;

    @Override
    public User insert(User t) {
        return dao.fastInsert(t);
    }
}

user.js：

var ioc = {
	userDao : {
		type : 'com.leiwenjie.base.support.user.dao.impl.UserDao',
		singleton : true,
		args : [ {
			refer : "dao"
		} ]
	}
};

MyNutTestRunner：

public class MyNutTestRunner extends NutTestRunner {

    public MyNutTestRunner(Class<?> klass) throws InitializationError {
        super(klass);
    }

    /**
     * 可覆盖createIoc,实现参数覆盖, bean替换,等定制.
     */
    protected Ioc createIoc() {
        Ioc ioc = null;
        try {
            ioc = new NutIoc(new ComboIocLoader("*js", "ioc/", "*anno", "com.leiwenjie.base.support.base",
                    "com.leiwenjie.base.support.user.dao"));
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        }
        return ioc;
    }
}

UserDaoTest：

@RunWith(MyNutTestRunner.class)
@IocBean
public class UserDaoTest {

    @Inject
    protected IUserDao userDao;

    @Test
    public void testSaveUser() {
        User user = new User();
        user.setLoginName("zhangsan");
        user.setPassword("abc123");
        user.setType(User.USER_REGIST_TYPE_LOCAL);
        user.setStatus(SupportConstants.CONS_STR_YES);
        user.setRegisterTime(new Date());
        userDao.insert(user);
        Assert.assertTrue(user.getId() != 0);
    }
}

异常信息：

org.nutz.ioc.IocException: IocBean[userDaoTest] throw Exception when creating
	at org.nutz.ioc.impl.ObjectMakerImpl.make(ObjectMakerImpl.java:149)
	at org.nutz.ioc.impl.NutIoc.get(NutIoc.java:210)
	at org.nutz.ioc.impl.NutIoc.get(NutIoc.java:239)
	at org.nutz.ioc.impl.NutIoc.get(NutIoc.java:146)
	at org.nutz.mock.NutTestRunner.createTest(NutTestRunner.java:71)
	at org.junit.runners.BlockJUnit4ClassRunner$1.runReflectiveCall(BlockJUnit4ClassRunner.java:266)
	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
	at org.junit.runners.BlockJUnit4ClassRunner.methodBlock(BlockJUnit4ClassRunner.java:263)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
	at org.nutz.mock.NutTestRunner.runChild(NutTestRunner.java:33)
	at org.nutz.mock.NutTestRunner.runChild(NutTestRunner.java:14)
	at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
	at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
	at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
	at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:86)
	at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:459)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:678)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:382)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:192)
Caused by: java.lang.RuntimeException: IocBean[userDaoTest] fail at field=[userDao]
	at org.nutz.ioc.weaver.FieldInjector.inject(FieldInjector.java:40)
	at org.nutz.ioc.weaver.DefaultWeaver.fill(DefaultWeaver.java:56)
	at org.nutz.ioc.impl.ObjectMakerImpl.make(ObjectMakerImpl.java:135)
	... 22 more
Caused by: org.nutz.ioc.IocException: IocBean[userDao] throw Exception when creating
	at org.nutz.ioc.impl.ObjectMakerImpl.make(ObjectMakerImpl.java:149)
	at org.nutz.ioc.impl.NutIoc.get(NutIoc.java:210)
	at org.nutz.ioc.val.ReferTypeValue.get(ReferTypeValue.java:60)
	at org.nutz.ioc.weaver.FieldInjector.inject(FieldInjector.java:32)
	... 24 more
Caused by: org.nutz.lang.born.BorningException: Fail to born or cast to 'com.leiwenjie.base.support.user.dao.impl.UserDao'
 by args: [@(org.nutz.dao.impl.NutDao@27e54167)]
 because: No suitable Constructor or Factory Method!!
	at org.nutz.lang.Mirror.getBorning(Mirror.java:954)
	at org.nutz.ioc.impl.ObjectMakerImpl.make(ObjectMakerImpl.java:107)
	... 27 more