我们使用此命令行在构建服务器上运行了一系列单元测试：
mkdir“％WORKSPACE％\ Results”del / Q“％WORKSPACE％\ Results *。*”
NCover Run --project =“％JOB_NAME％” - buildId =“％JOB_NAME％
％BUILD_NUMBER％V％THE_VERSION％“ - ％nunit_exe％输出\ XYZLibTests \ Product.XYZLib.Tests.dll / exclude：效果
/ noshadow /xml=Results\XYZLib-TestResults.xml
测试dll是一个c＃类库，.NET V4.5，NUnit是NUnit 2.6.4。 我们使用Spring.Net，测试dll的Context.xml文件是：
<objects xmlns="http://www.springframework.net"
xmlns:db="http://www.springframework.net/database"
xmlns:tx="http://www.springframework.net/tx">
<import resource="assembly://Product.Core.SqlServer/Product.Core.Config/Context.xml"/>
<import resource="assembly://Product.ImportLib/Product.Import.Config/Context.xml"/>
<db:provider id="dbProvider" provider="SqlServer-2.0"
connectionString="Data Source=(LocalDB)\v11.0;AttachDbFilename=|DataDirectory|\DBDataFile.mdf;Integrated Security=True"/>
<object id="transactionManager" type="Spring.Data.Core.AdoPlatformTransactionManager, Spring.Data">
<property name="DbProvider" ref="dbProvider"/>
</object>
<object name="Logger" type="Spring.Objects.Factory.Config.LogFactoryObject, Spring.Core">
<property name="logName" value="UnitTestLogger"/>
</object>
<object id="adoTemplate" type="Spring.Data.Core.AdoTemplate, Spring.Data">
<property name="CommandTimeout" value="240"/>
<property name="DbProvider" ref="dbProvider"/>
<property name="DataReaderWrapperType" value="Spring.Data.Support.NullMappingDataReader, Spring.Data"/>
</object>
</objects>
测试类看起来像这样：
public class ComponentDaoTest
{
[TestFixtureSetUp]
public void FixtureSetup()
{
this.ComponentDao = Context.GetObject<ComponentDao>();
}
[SetUp]
public void Setup()
{
this.ComponentDao.Truncate(); <--cleans localdb attached
}
//various tests to insert and select from localdb attached
[TearDown]
public void Complete()
{
this.ComponentDao.Truncate();<--cleans localdb attached
}
}
ComponentDao正在测试中，它在不同的程序集中定义：
<object id="ComponentDao" type="Product.Core.SqlServer.ComponentDao, Product.Core.SqlServer">
<property name="AdoTemplate" ref="adoTemplate"/>
</object>
它的类定义是：
public class ComponentDao : AdoDaoSupport, IComponentDao
IComponentDao是一个产品特定的接口，它不实现任何已知的接口，如IDisposable。
问题是，这些单元测试运行了一段时间，但我们会看到偶尔我们会得到所有这些的异常（在本例中为FindAllTest）：
TearDown Error : Product.CoreLib.Tests.Data.ComponentDaoTest.FindAllTest
16:16:20 SetUp : Spring.Data.CannotGetAdoConnectionException : Could not get ADO.NET connection.
16:16:20 ----> System.Data.SqlClient.SqlException : Connection Timeout Expired. The timeout period elapsed while attempting to consume the pre-login handshake acknowledgement. This could be because the pre-login handshake failed or the server was unable to respond back in time. The duration spent while attempting to connect to this server was - [Pre-Login] initialization=15370; handshake=55;
16:16:20 ----> System.ComponentModel.Win32Exception : The wait operation timed out
16:16:20 TearDown : Spring.Data.CannotGetAdoConnectionException : Could not get ADO.NET connection.
16:16:20 ----> System.Data.SqlClient.SqlException : Connection Timeout Expired. The timeout period elapsed while attempting to consume the pre-login handshake acknowledgement. This could be because the pre-login handshake failed or the server was unable to respond back in time. The duration spent while attempting to connect to this server was - [Pre-Login] initialization=15370; handshake=55;
16:16:20 ----> System.ComponentModel.Win32Exception : The wait operation timed out
16:16:20 at Spring.Data.Support.ConnectionUtils.GetConnectionTxPair(IDbProvider provider)
16:16:20 at Spring.Data.Core.AdoAccessor.GetConnectionTxPair(IDbProvider provider)
16:16:20 at Spring.Data.Core.AdoTemplate.Execute(ICommandCallback action)
16:16:20 at Spring.Data.Core.AdoTemplate.ExecuteNonQuery(CommandType cmdType, String cmdText)
16:16:20 at Product.Core.SqlServer.ComponentDao.Truncate() in c:\Jenkins\Workspace\...\CoreLib\SqlServer\ComponentDao.cs:line 133
16:16:20 at Product.CoreLib.Tests.Data.ComponentDaoTest.Setup() in c:\Jenkins\Workspace\...\CoreLib.Tests\Data\ComponentDaoTest.cs:line 39
16:16:20 --SqlException
16:16:20 at System.Data.ProviderBase.DbConnectionPool.TryGetConnection(DbConnection owningObject, UInt32 waitForMultipleObjectsTimeout, Boolean allowCreate, Boolean onlyOneCheckConnection, DbConnectionOptions userOptions, DbConnectionInternal& connection)
16:16:20 at System.Data.ProviderBase.DbConnectionPool.TryGetConnection(DbConnection owningObject, TaskCompletionSource`1 retry, DbConnectionOptions userOptions, DbConnectionInternal& connection)
16:16:20 at System.Data.ProviderBase.DbConnectionFactory.TryGetConnection(DbConnection owningConnection, TaskCompletionSource`1 retry, DbConnectionOptions userOptions, DbConnectionInternal oldConnection, DbConnectionInternal& connection)
16:16:20 at System.Data.ProviderBase.DbConnectionInternal.TryOpenConnectionInternal(DbConnection outerConnection, DbConnectionFactory connectionFactory, TaskCompletionSource`1 retry, DbConnectionOptions userOptions)
16:16:20 at System.Data.ProviderBase.DbConnectionClosed.TryOpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory, TaskCompletionSource`1 retry, DbConnectionOptions userOptions)
16:16:20 at System.Data.SqlClient.SqlConnection.TryOpenInner(TaskCompletionSource`1 retry)
16:16:20 at System.Data.SqlClient.SqlConnection.TryOpen(TaskCompletionSource`1 retry)
16:16:20 at System.Data.SqlClient.SqlConnection.Open()
16:16:20 at Spring.Data.Support.ConnectionUtils.DoGetConnection(IDbProvider provider)
16:16:20 at Spring.Data.Support.ConnectionUtils.GetConnectionTxPair(IDbProvider provider)
16:16:20 --Win32Exception
16:16:20
16:16:20 --TearDown
16:16:20 at Spring.Data.Support.ConnectionUtils.GetConnectionTxPair(IDbProvider provider)
16:16:20 at Spring.Data.Core.AdoAccessor.GetConnectionTxPair(IDbProvider provider)
16:16:20 at Spring.Data.Core.AdoTemplate.Execute(ICommandCallback action)
16:16:20 at Spring.Data.Core.AdoTemplate.ExecuteNonQuery(CommandType cmdType, String cmdText)
16:16:20 at Product.Core.SqlServer.ComponentDao.Truncate() in c:\Jenkins\Workspace\...\CoreLib\SqlServer\ComponentDao.cs:line 133
16:16:20 at Product.CoreLib.Tests.Data.ComponentDaoTest.Complete() in c:\Jenkins\Workspace\...\CoreLib.Tests\Data\ComponentDaoTest.cs:line 48
16:16:20 --SqlException
16:16:20 at System.Data.ProviderBase.DbConnectionPool.TryGetConnection(DbConnection owningObject, UInt32 waitForMultipleObjectsTimeout, Boolean allowCreate, Boolean onlyOneCheckConnection, DbConnectionOptions userOptions, DbConnectionInternal& connection)
16:16:20 at System.Data.ProviderBase.DbConnectionPool.TryGetConnection(DbConnection owningObject, TaskCompletionSource`1 retry, DbConnectionOptions userOptions, DbConnectionInternal& connection)
16:16:20 at System.Data.ProviderBase.DbConnectionFactory.TryGetConnection(DbConnection owningConnection, TaskCompletionSource`1 retry, DbConnectionOptions userOptions, DbConnectionInternal oldConnection, DbConnectionInternal& connection)
16:16:20 at System.Data.ProviderBase.DbConnectionInternal.TryOpenConnectionInternal(DbConnection outerConnection, DbConnectionFactory connectionFactory, TaskCompletionSource`1 retry, DbConnectionOptions userOptions)
16:16:20 at System.Data.ProviderBase.DbConnectionClosed.TryOpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory, TaskCompletionSource`1 retry, DbConnectionOptions userOptions)
16:16:20 at System.Data.SqlClient.SqlConnection.TryOpenInner(TaskCompletionSource`1 retry)
16:16:20 at System.Data.SqlClient.SqlConnection.TryOpen(TaskCompletionSource`1 retry)
16:16:20 at System.Data.SqlClient.SqlConnection.Open()
16:16:20 at Spring.Data.Support.ConnectionUtils.DoGetConnection(IDbProvider provider)
16:16:20 at Spring.Data.Support.ConnectionUtils.GetConnectionTxPair(IDbProvider provider)
16:16:20 --Win32Exception
我猜所有测试都使用与Context.xml中配置的相同localdb数据库相同的Ado Connection，但问题是，有时它们都运行没有错误。这些测试在很长一段时间内都没有改变，所以开关失败让我们感到困惑。