异常内容：

org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'com.imooc.weixindemo.repository.ProductCategoryRepository' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}

ProductCategory类：

package com.imooc.weixindemo.dataobject;

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;

@Entity
public class ProductCategory {

    @Id
    @GeneratedValue
    private Integer categoryId;
    private String categoryName;
    private Integer categoryType;

    public Integer getCategoryId() {
        return categoryId;
    }

    public void setCategoryId(Integer categoryId) {
        this.categoryId = categoryId;
    }

    public String getCategoryName() {
        return categoryName;
    }

    public void setCategoryName(String categoryName) {
        this.categoryName = categoryName;
    }

    public Integer getCategoryType() {
        return categoryType;
    }

    public void setCategoryType(Integer categoryType) {
        this.categoryType = categoryType;
    }
}

ProductCategoryRepository类：

package com.imooc.weixindemo.repository;

import com.imooc.weixindemo.dataobject.ProductCategory;
import org.springframework.data.jpa.repository.JpaRepository;


public interface ProductCategoryRepository extends JpaRepository<ProductCategory,Integer> {

}

package com.imooc.weixindemo.repository;

import com.imooc.weixindemo.dataobject.ProductCategory;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;

import java.util.Optional;

@RunWith(SpringRunner.class)
@SpringBootTest
public class ProductCategoryRepositoryTest {

    @Autowired
    private ProductCategoryRepository productCategoryRepository;

    @Test
    public void findOneTest(){
        Optional<ProductCategory> optionalProductCategory = productCategoryRepository.findById(1);


    }
    @Test
    public void saveTest(){
        ProductCategory productCategory = new ProductCategory();
        productCategory.setCategoryName("女生最爱");
        productCategory.setCategoryType(3);
        productCategoryRepository.save(productCategory);
    }

}

而且，老师写的：

public void findOneTest(){
	//在我的环境中不支持这样写 ？？？
	ProductCategory productCategory = repository.findOne(1); 

}