Unit test failure when running from Ant

I've created a number of GWT unit tests, and these work just fine when run out of eclipse.  However there's a different story running out of the command line:

ant test.dev 

Buildfile: build.xml

libs:

javac:

    [javac] build.xml:29: warning: 'includeantruntime' was not set, defaulting to build.sysclasspath=last; set to false for repeatable builds

javac.tests:

    [javac] build.xml:78: warning: 'includeantruntime' was not set, defaulting to build.sysclasspath=last; set to false for repeatable builds

    [javac] Compiling 165 source files to war\WEB-INF\classes

    [javac] Note: Some input files use or override a deprecated API.

    [javac] Note: Recompile with -Xlint:deprecation for details.

test.dev:

    [mkdir] Created dir: reports\htmlunit.dev

    [junit] WARNING: multiple versions of ant detected in path for junit

    [junit]          jar:file:/C:/Program%20Files%20(x86)/apache-ant-1.8.4/lib/ant.jar!/org/apache/tools/ant/Project.class

    [junit]      and jar:file:/C:/Program%20Files%20(x86)/gwt-2.5.0.rc1/gwt-dev.jar!/org/apache/tools/ant/Project.class

    [junit] Running src.uk.co.ricoh.ppbg.sd.shark.ui.nls.messages.BeanMessagesUnitTest

    [junit] Tests run: 1, Failures: 0, Errors: 1, Time elapsed: 0 sec

BUILD FAILED

build.xml:87: Test src.uk.co.ricoh.ppbg.sd.shark.ui.nls.messages.BeanMessagesUnitTest failed

Total time: 4 seconds

The BeanMessageUnitTest.txt contains: 

java.lang.ClassNotFoundException: src.uk.co.ricoh.ppbg.sd.shark.ui.nls.messages.BeanMessagesUnitTest

at java.net.URLClassLoader$1.run(URLClassLoader.java:366)

As it compiles just fine, where could the problem be coming from?

Thanks
Simon

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