I use Hudson with a seam-gen project. Test reports are published with these settings:

I checked Publish JUnit test result report and set

<myproject>/test-report/**/*.xml

in Text Report XML.

This is the 'test' ant target. Can't remember if I manually changed something after seam-gen:

    <target name="test" depends="buildtest" description="Run the tests">
        <taskdef resource="testngtasks" classpath="${testng.jar}"/>
        <path id="test.path">
            <path path="${test.dir}"/>
            <fileset dir="${lib.dir}/test">
                <include name="*.jar"/>
            </fileset>
            <path path="${bootstrap.dir}"/>
            <path refid="build.classpath"/>
        </path>
        <delete dir="${bootstrap.dir}/data/hypersonic"/>
        <testng outputdir="${basedir}/test-report">
            <classpath refid="test.path"/>
            <!--<jvmarg value="-Demma.coverage.out.file=${coverage.ec}" />-->
            <jvmarg line="-Djava.awt.headless=true"/>
            <!--added for JDK6 compatibility with JBoss embedded-->
            <jvmarg line="-Dsun.lang.ClassLoader.allowArraySyntax=true"/>
            <xmlfileset dir="${test.dir}" includes="*Test.xml"/>
        </testng>
    </target>