我在学习spring：我有一个简单的基于spring的junit测试，但是我不明白为什么一个测试失败而另一个没有，因为我期望 @Autowired 注解在两者中都起作用
我有两门课：

package it.euphoria.data.service;

import it.euphoria.data.entity.Customer;
import it.euphoria.data.entity.Seller;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.data.jpa.repository.Query;
import org.springframework.data.repository.query.Param;
import org.springframework.stereotype.Repository;

import javax.validation.constraints.NotNull;
import java.util.Set;

public interface CustomerRepository extends JpaRepository<Customer, Long> {

    @Query("SELECT cust FROM Customer cust WHERE cust.seller = :seller")
    Set<Customer> getBySeller(@NotNull @Param("seller") Seller seller);

}

以及服务级别：

package it.euphoria.data.service;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class CustomerService {

    private CustomerRepository customerRepository;

    @Autowired
    public CustomerService(CustomerRepository customerRepository) {
        this.customerRepository = customerRepository;
    }

    public CustomerRepository getCustomerRepository() {
        return customerRepository;
    }

}

如果在测试时，我自动连线 CustomerRepository 工作正常，但如果我自动连线 CustomerService 我收到一封信 UnsatisfiedDependencyException 这是工作测试 CustomerRepository :

package it.euphoria.data.service;

import it.euphoria.data.entity.Customer;
import org.junit.Assert;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.autoconfigure.orm.jpa.DataJpaTest;
import org.springframework.test.context.junit4.SpringRunner;

@RunWith(SpringRunner.class)
@DataJpaTest
public class CustomerRepositoryTest {
    @Autowired
    CustomerRepository customerRepository;        

    @Test
    public void getBySeller() {
        //test things...
    }
}

这是一个破碎的 CustomerService 唯一的区别是：

package it.euphoria.data.service;

import it.euphoria.data.entity.Customer;
import org.junit.Assert;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.autoconfigure.orm.jpa.DataJpaTest;
import org.springframework.test.context.junit4.SpringRunner;

@RunWith(SpringRunner.class)
@DataJpaTest
public class CustomerRepositoryTest {
    @Autowired
    CustomerService customerService; //<-- The error is here    

    @Test
    public void getBySeller() {
        //test things...
    }
}

这是stacktrace：
org.springframework.beans.factory.unsatifieddependencyException:创建名为“it.ephoria.data.service.customerrepositorytest”的bean时出错：通过字段“customerservice”表示的未满足的依赖关系；嵌套异常为org.springframework.beans.factory.nosuchbeandefinitionexception:没有类型为“it.ephoria.data.service.customerservice”的限定bean可用：至少需要1个符合autowire候选的bean。依赖项注解：{@org.springframework.beans.factory.annotation.autowired（required=true）}
我找到了这个问题和答案，但没有解决问题。你能帮我理解我做错了什么吗？