error:

Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.011 sec
Running hudson.util.ProcessTreeTest
Tests run: 1, Failures: 0, Errors: 1, Skipped: 0, Time elapsed: 0.181 sec <<< FAILURE!
Running hudson.model.LoadStatisticsTest
Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 2.089 sec
Running hudson.util.ArgumentListBuilderTest
Tests run: 5, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.053 sec
Running hudson.util.RobustReflectionConverterTest
Tests run: 2, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.029 sec
Running hudson.util.VersionNumberTest
Tests run: 3, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.074 sec
Running hudson.util.CyclicGraphDetectorTest
Tests run: 3, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.038 sec

Results :

Tests in error:
  testRemoting(hudson.util.ProcessTreeTest)

Tests run: 102, Failures: 0, Errors: 1, Skipped: 0

[INFO] ------------------------------------------------------------------------
[ERROR] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] There are test failures.

Please refer to D:\PROJEKTI\Maven\hudson\main\core\target\surefire-reports for the individual test results.
[INFO] ------------------------------------------------------------------------
[INFO] For more information, run Maven with the -e switch
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 17 minutes 58 seconds
[INFO] Finished at: Fri Jun 11 21:04:46 CEST 2010
[INFO] Final Memory: 85M/152M
[INFO] ------------------------------------------------------------------------

error log:

-------------------------------------------------------------------------------
Test set: hudson.util.ProcessTreeTest
-------------------------------------------------------------------------------
Tests run: 1, Failures: 0, Errors: 1, Skipped: 0, Time elapsed: 0.181 sec <<< FAILURE!
testRemoting(hudson.util.ProcessTreeTest)  Time elapsed: 0.169 sec  <<< ERROR!
org.jvnet.winp.WinpException: Failed to read environment variable table error=299 at .\envvar-cmdline.cpp:114
    at org.jvnet.winp.Native.getCmdLineAndEnvVars(Native Method)
    at org.jvnet.winp.WinProcess.parseCmdLineAndEnvVars(WinProcess.java:114)
    at org.jvnet.winp.WinProcess.getEnvironmentVariables(WinProcess.java:109)
    at hudson.util.ProcessTree$Windows$1.getEnvironmentVariables(ProcessTree.java:419)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at hudson.remoting.RemoteInvocationHandler$RPCRequest.perform(RemoteInvocationHandler.java:274)
    at hudson.remoting.RemoteInvocationHandler$RPCRequest.call(RemoteInvocationHandler.java:255)
    at hudson.remoting.RemoteInvocationHandler$RPCRequest.call(RemoteInvocationHandler.java:215)
    at hudson.remoting.UserRequest.perform(UserRequest.java:114)
    at hudson.remoting.UserRequest.perform(UserRequest.java:48)
    at hudson.remoting.Request$2.run(Request.java:270)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
    at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
    at java.util.concurrent.FutureTask.run(FutureTask.java:138)
    at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
    at java.lang.Thread.run(Thread.java:619)

does anyone have any idea what can be wrong in test?

Regards