当我使用 ant 运行测试时，我无法说服一些新代码与我的 JUnit 测试很好地配合使用。
我有一些使用适用于 Java 的 AWS 开发工具包与 AWS（亚马逊网络服务）交互的代码。当我的 Junit 测试遇到引用此 SDK 中任何内容的代码时，测试会失败。当我逐步完成时，代码本身运行良好，失败的是预先存在的和其他成功的 Junit 测试。
我已经使用 -v 选项从命令行运行了 ant，我可以看到 AWS SDK for Java 的 jar 文件包含在类路径中。Ant 和 JUnit 也在那里。-v 选项显示在 actOnTestResult 中报告了失败，但这不是错误本身发生的地方。
ant -v 的完整输出为：
Apache Ant(TM) version 1.8.2 compiled on December 3 2011
Trying the default build file: build.xml
Buildfile: /home/tonyb1/Dev/Workspace/S3DataExtractionDeploy/build.xml
Detected Java version: 1.6 in: /usr/lib/jvm/jdk1.6.0_32/jre
Detected OS: Linux
parsing buildfile /home/tonyb1/Dev/Workspace/S3DataExtractionDeploy/build.xml with URI = file:/home/tonyb1/Dev/Workspace/S3DataExtractionDeploy/build.xml
Project base dir set to: /home/tonyb1/Dev/Workspace/S3DataExtractionDeploy
parsing buildfile jar:file:/usr/share/ant/lib/ant.jar!/org/apache/tools/ant/antlib.xml with URI = jar:file:/usr/share/ant/lib/ant.jar!/org/apache/tools/ant/antlib.xml from a zip file
Importing file /home/tonyb1/Dev/Workspace/S3DataExtractionDeploy/lib/one-jar-ant-task.xml from /home/tonyb1/Dev/Workspace/S3DataExtractionDeploy/build.xml
Overriding previous definition of reference to ant.projectHelper
parsing buildfile /home/tonyb1/Dev/Workspace/S3DataExtractionDeploy/lib/one-jar-ant-task.xml with URI = file:/home/tonyb1/Dev/Workspace/S3DataExtractionDeploy/lib/one-jar-ant-task.xml
Override ignored for property "one-jar.dist.dir"
Overriding previous definition of reference to ant.projectHelper
Build sequence for target(s) `junit' is [init, compile, junit]
Complete build sequence is [init, compile, junit, input-cmdlineargs, jar, onejar, run-cmdline, input-fileprops, run-hudson, help, clean, usage, input-eclipseargs, run-eclipse, ]
init:
[echo] Creating build directories...
[mkdir] Skipping /home/tonyb1/Dev/Workspace/S3DataExtractionDeploy/build because it already exists.
[mkdir] Skipping /home/tonyb1/Dev/Workspace/S3DataExtractionDeploy/build/class because it already exists.
[mkdir] Skipping /home/tonyb1/Dev/Workspace/S3DataExtractionDeploy/build/jar because it already exists.
[mkdir] Skipping /home/tonyb1/Dev/Workspace/S3DataExtractionDeploy/dist because it already exists.
compile:
[echo] Compiling source files...
[javac] /home/tonyb1/Dev/Workspace/S3DataExtractionDeploy/src/AwsCredentials.properties skipped - don't know how to handle it
[javac] com/sportingindex/tradingservices/hadoop/aws/S3DataExtractionDeploy.java omitted as /home/tonyb1/Dev/Workspace/S3DataExtractionDeploy/build/class/com/sportingindex/tradingservices/hadoop/aws/S3DataExtractionDeploy.class is up to date.
[javac] com/sportingindex/tradingservices/test/hadoop/aws/JUnit_S3DataExtractionDeploy.java omitted as /home/tonyb1/Dev/Workspace/S3DataExtractionDeploy/build/class/com/sportingindex/tradingservices/test/hadoop/aws/JUnit_S3DataExtractionDeploy.class is up to date.
junit:
[junit] Implicitly adding /usr/share/ant/lib/junit.jar:/usr/share/java/ant-launcher-1.8.2.jar:/usr/share/ant/lib/ant.jar:/usr/share/ant/lib/ant-junit.jar:/usr/share/ant/lib/ant-junit4.jar to CLASSPATH
[junit] Executing '/usr/lib/jvm/jdk1.6.0_32/jre/bin/java' with arguments:
[junit] '-classpath'
[junit] '/home/tonyb1/Dev/Workspace/S3DataExtractionDeploy/build/class:/home/tonyb1/Dev/Workspace/S3DataExtractionDeploy/lib/aws-java-sdk-1.3.7.jar:/home/tonyb1/Dev/Workspace/S3DataExtractionDeploy/lib/commons-codec-1.6.jar:/home/tonyb1/Dev/Workspace/S3DataExtractionDeploy/lib/commons-collections-3.2.1.jar:/home/tonyb1/Dev/Workspace/S3DataExtractionDeploy/lib/commons-logging-1.0.4.jar:/home/tonyb1/Dev/Workspace/S3DataExtractionDeploy/lib/httpclient-4.1.3.jar:/home/tonyb1/Dev/Workspace/S3DataExtractionDeploy/lib/httpcore-4.2.jar:/home/tonyb1/Dev/Workspace/S3DataExtractionDeploy/lib/junit.jar:/home/tonyb1/Dev/Workspace/S3DataExtractionDeploy/lib/one-jar-ant-task-0.97.jar:/usr/share/ant/lib/junit.jar:/usr/share/java/ant-launcher-1.8.2.jar:/usr/share/ant/lib/ant.jar:/usr/share/ant/lib/ant-junit.jar:/usr/share/ant/lib/ant-junit4.jar'
[junit] 'org.apache.tools.ant.taskdefs.optional.junit.JUnitTestRunner'
[junit] 'com.sportingindex.tradingservices.test.hadoop.aws.JUnit_S3DataExtractionDeploy'
[junit] 'filtertrace=true'
[junit] 'haltOnError=false'
[junit] 'haltOnFailure=true'
[junit] 'formatter=org.apache.tools.ant.taskdefs.optional.junit.SummaryJUnitResultFormatter'
[junit] 'showoutput=false'
[junit] 'outputtoformatters=true'
[junit] 'logfailedtests=true'
[junit] 'logtestlistenerevents=false'
[junit] 'crashfile=/home/tonyb1/Dev/Workspace/S3DataExtractionDeploy/junitvmwatcher8947588636768864827.properties'
[junit] 'propsfile=/home/tonyb1/Dev/Workspace/S3DataExtractionDeploy/junit7746049445603740673.properties'
[junit]
[junit] The ' characters around the executable and arguments are
[junit] not part of the command.
[junit] Running com.sportingindex.tradingservices.test.hadoop.aws.JUnit_S3DataExtractionDeploy
[junit] Tests run: 4, Failures: 0, Errors: 4, Time elapsed: 0.756 sec
BUILD FAILED
/home/tonyb1/Dev/Workspace/S3DataExtractionDeploy/build.xml:218: Test com.sportingindex.tradingservices.test.hadoop.aws.JUnit_S3DataExtractionDeploy failed
at org.apache.tools.ant.taskdefs.optional.junit.JUnitTask.actOnTestResult(JUnitTask.java:1954)
at org.apache.tools.ant.taskdefs.optional.junit.JUnitTask.execute(JUnitTask.java:854)
at org.apache.tools.ant.taskdefs.optional.junit.JUnitTask.executeOrQueue(JUnitTask.java:1899)
at org.apache.tools.ant.taskdefs.optional.junit.JUnitTask.execute(JUnitTask.java:800)
at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:291)
at sun.reflect.GeneratedMethodAccessor4.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)
at org.apache.tools.ant.Task.perform(Task.java:348)
at org.apache.tools.ant.Target.execute(Target.java:390)
at org.apache.tools.ant.Target.performTasks(Target.java:411)
at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1399)
at org.apache.tools.ant.Project.executeTarget(Project.java:1368)
at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:41)
at org.apache.tools.ant.Project.executeTargets(Project.java:1251)
at org.apache.tools.ant.Main.runBuild(Main.java:809)
at org.apache.tools.ant.Main.startAnt(Main.java:217)
at org.apache.tools.ant.launch.Launcher.run(Launcher.java:280)
at org.apache.tools.ant.launch.Launcher.main(Launcher.java:109)
Total time: 2 seconds
如果我通过 Eclipse 运行或调试测试，那很好。只有在使用 ant 运行测试时才会出现错误。