我有一个使用log4net的组件。我想创建单元测试,验证某些错误条件会导致正确的日志记录。
我认为最好的方法是创建一个ILogAppender实现,例如mock。然后,我会在测试设置期间将log appender添加到log4net,检查测试验证期间写入的内容,并在测试拆解期间再次删除它。
这可能吗?
答案 0 :(得分:19)
使用BasicConfigurator可以进行单元测试(OP要求的内容,但不是主题行中的内容)。另一个答案是获取特定记录器的输出。
我想要所有(这是一个网站内的'自测'页面)。最后我基本上做了以下几点:
var root = ((log4net.Repository.Hierarchy.Hierarchy)LogManager.GetRepository()).Root;
var attachable = root as IAppenderAttachable;
var appender = new log4net.Appender.MemoryAppender();
if(attachable!=null)
attachable.AddAppender(appender);
// do stuff
var loggingEvents = appender.GetEvents();
foreach (var loggingEvent in loggingEvents)
loggingEvent.WriteRenderedMessage(writer);
if(attachable!=null)
attachable.RemoveAppender(appender);
......但按照@ Pawel的方法包装成Disposable
更新:Pawel的答案已被删除,所以我在这里添加他的链接: Programmatically check Log4Net log
答案 1 :(得分:11)
我一直在使用配置了the BasicConfigurator的MemoryAppender。此附加程序允许您访问测试期间记录的内存中消息。
答案 2 :(得分:3)
最初在apache mailing list archives上找到以下代码,并且应解决在代码中添加和删除log4net appender的问题
/// <summary>
/// dataLog
/// </summary>
protected static readonly IDeviceCommunicationsLog dataLog =
DeviceCommunicationsLogManager.GetLogger("LIS3.Data");
Each connection adds and removes a file appender programmatically:
/// <summary>
/// add connection specific appender
/// </summary>
void AddAppender()
{
// check if logging is endabled
if( this.IsLoggingEnabled() )
{
try
{
// get the interface
IAppenderAttachable connectionAppender = (IAppenderAttachable)this.DataLog.Logger;
// need some application configuration settings
NameValueCollection appSettings = ConfigurationSettings.AppSettings;
// get the layout string
string log4netLayoutString = appSettings["log4net.LIS3.LayoutString"];
if( log4netLayoutString == null )
{
// use default setting
log4netLayoutString = "%d [%x]%n %m%n %P MessageData}%n%n";
}
// get logging path
string log4netPath = appSettings["log4net.Path"];
if( log4netPath == null )
{
// use default path
log4netPath = ".\\";
}
// create the appender
this.rollingFileAppender = new RollingFileAppender();
// setup the appender
this.rollingFileAppender.MaxFileSize = 10000000;
this.rollingFileAppender.MaxSizeRollBackups = 2;
this.rollingFileAppender.RollingStyle = RollingFileAppender.RollingMode.Size;
this.rollingFileAppender.StaticLogFileName = true;
string appenderPath = LogSourceName + ".log";
// log source name may have a colon - if soreplace with underscore
appenderPath = appenderPath.Replace( ':', '_' );
// now add to log4net path
appenderPath = Path.Combine( log4netPath, appenderPath );
// update file property of appender
this.rollingFileAppender.File = appenderPath;
// add the layout
PatternLayout patternLayout = new PatternLayout( log4netLayoutString );
this.rollingFileAppender.Layout = patternLayout;
// add the filter for the log source
NDCFilter sourceFilter = new NDCFilter();
sourceFilter.StringToMatch = this.LogSourceName;
this.rollingFileAppender.AddFilter( sourceFilter);
// now add the deny all filter to end of the chain
DenyAllFilter denyAllFilter = new DenyAllFilter();
this.rollingFileAppender.AddFilter( denyAllFilter );
// activate the options
this.rollingFileAppender.ActivateOptions();
// add the appender
connectionAppender.AddAppender( this.rollingFileAppender );
}
catch( Exception x )
{
this.ErrorLog.Error( "Error creating LIS3 data log appender for " + LogSourceName, x );
}
}
}
/// <summary>
/// remove connection specific appender
/// </summary>
void RemoveAppender()
{
// check if we have one
if( this.rollingFileAppender != null )
{
// cast to required interface
IAppenderAttachable connectionAppender = (IAppenderAttachable)this.DataLog.Logger;
// remove the appendier
connectionAppender.RemoveAppender( rollingFileAppender );
// set to null
this.rollingFileAppender = null;
}
}
答案 3 :(得分:1)
怎么样:
((log4net.Repository.Hierarchy.Logger) theLogger.Logger).RemoveAppender("SomeAppender");
添加相同。