Revert "[test] Remove dirties context annotation"

This reverts commit 97904b5.

Author: hazendaz

src/test/java/org/mybatis/spring/sample/SampleSqlSessionTest.java

@@ -21,12 +21,14 @@
 import org.mybatis.spring.sample.domain.User;
 import org.mybatis.spring.sample.service.BarService;
 import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.test.annotation.DirtiesContext;
 import org.springframework.test.context.junit.jupiter.SpringJUnitConfig;
 
 /**
  * Example of basic MyBatis-Spring integration usage with a manual DAO implementation that subclasses
  * SqlSessionDaoSupport.
  */
+@DirtiesContext
 @SpringJUnitConfig(locations = { "classpath:org/mybatis/spring/sample/config/applicationContext-sqlsession.xml" })
 class SampleSqlSessionTest {