spring项目如何写单元测试

import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations={
		"classpath:application-context.xml",
		"classpath:application-database.xml",
		"classpath:application-redis.xml"})
public class PartRelevanceTest {
	
	@Resource
	private PartRelevanceMapper partRelevanceMapper;
		
	@Test 
	public void selectTypeNumOne() {
		PartRelevanceTypeNum record = new PartRelevanceTypeNum();
		record.setRelCode("2222112");
		record.setType("2");
		PartRelevanceTypeNum typeNum = partRelevanceMapper.selectTypeNumOne(record);
		System.out.println(typeNum==null?"typeNum-数据为空":typeNum.toString());
	}
}