Datanode其中一个磁盘卷故障(Datanode one of the disk volume failure)

 我发现要做到这一点的最佳方式是： 
 
 
 
 开始测试 
 
 
 开始交易 
 
 
 （可选）使用类似DBUnit的方式加载测试需要的任何DB数据 
 
 
 运行测试 
 
 
 回滚事务 
 
 
 请注意，所有数据库操作都发生在同一个事务中。 由于此事务在测试结束时回滚（即使引发异常），数据库在测试结束时应始终处于与开始时相同的状态。 
 
 Spring提供了一些真正有用的类，它们将负责为每个测试启动和回滚事务。 如果您使用的是Spring＆JUnit4，并且不介意您的测试类需要扩展Spring类，那么最简单的选择可能是扩展AbstractTransactionalJUnit4SpringContextTests 
 
// Location of the Spring config file(s)
@ContextConfiguration(locations = {"/application-context-test.xml", "classpath*:/application-context-persistence-test.xml"})

// Transaction manager bean name
@TransactionConfiguration(transactionManager = "hsqlTransactionManager", defaultRollback = true)
@Transactional(propagation=Propagation.REQUIRES_NEW)
public class MyTransactionalTests extends AbstractTransactionalJUnit4SpringContextTests {

    @Test
    public void thisWillRunInATransactionThatIsAutomaticallyRolledBack() {}
}
 
 如果您不想扩展Spring类，则可以使用注释来配置测试运行器。 Spring还支持许多其他主要的单元测试框架和旧版本的JUnit。 

The best way I've found to do this is:
 
 
 
start test 
 
 
start transaction
 
 
(optional) load any DB data the test requires using something like DBUnit
 
 
run test
 
 
rollback transaction
 
 
Notice that all DB operations occur within the same transaction. Because this transaction is rolled back at the end of the test (even if an exception is thrown), the database should always be in the same state at the end of the test as it was at the start.
 
Spring provides some really useful classes that will take care of starting and rolling back the transaction for each test. If you're using Spring & JUnit4 and don't mind that your test classes have to extend a Spring class the easiest option is probably to extend AbstractTransactionalJUnit4SpringContextTests
 
// Location of the Spring config file(s)
@ContextConfiguration(locations = {"/application-context-test.xml", "classpath*:/application-context-persistence-test.xml"})

// Transaction manager bean name
@TransactionConfiguration(transactionManager = "hsqlTransactionManager", defaultRollback = true)
@Transactional(propagation=Propagation.REQUIRES_NEW)
public class MyTransactionalTests extends AbstractTransactionalJUnit4SpringContextTests {

    @Test
    public void thisWillRunInATransactionThatIsAutomaticallyRolledBack() {}
}
 
If you don't want to extend a Spring class, you can configure a test-runner instead using annotations. Spring also supports many of the other major unit-testing frameworks and older versions of JUnit.