解决单元测试时报Could not instantiate问题

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运行单元测试类时，报以下错：
log4j:ERROR Could not instantiate class [com.moonlit.logfaces.appenders.AsyncSocketAppender].java.lang.ClassNotFoundException: com.moonlit.logfaces.appenders.AsyncSocketAppenderat java.net.URLClassLoader$1.run(URLClassLoader.java:366)at java.net.URLClassLoader$1.run(URLClassLoader.java:355)at java.security.AccessController.doPrivileged(Native Method)at java.net.URLClassLoader.findClass(URLClassLoader.java:354)at java.lang.ClassLoader.loadClass(ClassLoader.java:425)at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)at java.lang.ClassLoader.loadClass(ClassLoader.java:358)at java.lang.Class.forName0(Native Method)at java.lang.Class.forName(Class.java:191)at org.apache.log4j.helpers.Loader.loadClass(Loader.java:198)at org.apache.log4j.helpers.OptionConverter.instantiateByClassName(OptionConverter.java:327)at org.apache.log4j.helpers.OptionConverter.instantiateByKey(OptionConverter.java:124)at org.apache.log4j.PropertyConfigurator.parseAppender(PropertyConfigurator.java:785)at org.apache.log4j.PropertyConfigurator.parseCategory(PropertyConfigurator.java:768)at org.apache.log4j.PropertyConfigurator.configureRootCategory(PropertyConfigurator.java:648)at org.apache.log4j.PropertyConfigurator.doConfigure(PropertyConfigurator.java:514)at org.apache.log4j.PropertyConfigurator.doConfigure(PropertyConfigurator.java:580)at org.apache.log4j.helpers.OptionConverter.selectAndConfigure(OptionConverter.java:526)at org.apache.log4j.LogManager.<clinit>(LogManager.java:127)at org.apache.log4j.Logger.getLogger(Logger.java:117)at com.ule.test.project.postal.common.XmlUtil.<clinit>(XmlUtil.java:24)at com.ule.test.project.common.TestMy.test(TestMy.java:20)at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)at java.lang.reflect.Method.invoke(Method.java:606)at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44)at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:76)at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193)at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52)at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191)at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42)at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184)at org.junit.runners.ParentRunner.run(ParentRunner.java:236)at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:49)at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)log4j:ERROR Could not instantiate appender named "LFS".
原因：
缺少log4j配置文件
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