Jboss seam + Junit + Ant

Pessoal,

Tenho um projeto desenvolvido com Jboss Seam. Fiz a integracao dele com o JUNIT para rodar minhas classes de teste. Ate ai tudo bem, mas quando eu tento rodar as classes Junit com o Ant da o seguinte erro:

Testsuite: br.gov.cgu.projeto.test.DownloadFileTest
Tests run: 1, Failures: 0, Errors: 1, Time elapsed: 0 sec

Caused an ERROR

org/jboss/seam/mock/AbstractSeamTest
java.lang.NoClassDefFoundError: org/jboss/seam/mock/AbstractSeamTest
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClassCond(Unknown Source)
at java.lang.ClassLoader.defineClass(Unknown Source)
at java.security.SecureClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.access$000(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClassCond(Unknown Source)
at java.lang.ClassLoader.defineClass(Unknown Source)
at java.security.SecureClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.access$000(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Unknown Source)
Caused by: java.lang.ClassNotFoundException: org.jboss.seam.mock.AbstractSeamTest
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)

Build.xml:

	</classpath>           
	<batchtest fork="true" todir="${test.report.dir}" >                
		<fileset dir="C:/tools/eclipse/workspace/Projeto/bin">  
			
			<include name="**/*Test.*" />
			
		</fileset>          
	</batchtest>         
</junit>
<junitreport todir="C:/tools/eclipse/workspace/Projeto/tmp/junitreports">
 	      <fileset dir="C:/tools/eclipse/workspace/Projeto/tmp/junitreports"/>
 	      <report todir="C:/tools/eclipse/workspace/Projeto/tmp/junitreports"/>
 	   </junitreport>     

Classes de teste:
Essa que faz a integracao JBoss co Junit:

package br.gov.cgu.proetica.test;

import org.jboss.seam.mock.AbstractSeamTest;
import org.junit.After;
import org.junit.AfterClass;
import org.junit.Before;
import org.junit.BeforeClass;

public class JUnitSeamTest extends AbstractSeamTest {

 // static helper instance to call non static methods in
// a static method
private static JUnitSeamTest seamTest = new JUnitSeamTest();
private static boolean batch = false;

/*
 *   JUnit test life cycle methods.
 */

@BeforeClass
public static  void setUpBeforeClass() throws Exception {
    if (!batch) seamTest.startContainer();
}

@AfterClass
public static void tearDownAfterClass() throws Exception {        
    if (!batch) seamTest.stopContainer();        
}

@Before
public void setUp() throws Exception {        
    setupClass();                
    begin();
}

@After
public void tearDown() throws Exception {            
    end();
    cleanupClass();
}

/*
 *  Helper methods 
 */

// starts the JBoss embedded ejb container
public void startContainer() throws Exception {        
    super.startSeam();
}

// stops the JBoss embedded ejb container
public void stopContainer() throws Exception {
    super.stopSeam();
}

public boolean isBatch() {
    return batch;
}

// used by a JUnit.Suite runner to set the batch flag 
public void setBatch(boolean fBatch) {
    batch = fBatch;
}

}

Classe de teste do meu projeto:
import junit.framework.Assert;

import org.jboss.seam.mock.AbstractSeamTest.FacesRequest;
import org.junit.After;
import org.junit.AfterClass;
import org.junit.Before;
import org.junit.BeforeClass;
import org.junit.Test;

import br.gov.cgu.projeto.session.DownloadFile;

public class DownloadFileTest extends JUnitSeamTest{

 @Test
 public void downloadArquivoResposta() throws Exception {    
     new FacesRequest("/novoRepresentante.xhtml") { 
     	           			
 			protected void testComponents()  {            				
 				Assert.assertNotNull(getInstance("downloadFile"));
 				DownloadFile downloadFile = (DownloadFile) getInstance("downloadFile");            				
 				Assert.assertEquals(null, downloadFile.downloadArquivoResposta());
 				
 			}
 		}.run();
     }

Eu sei que ele nao esta encontrando a classe AbstractSeamTest, ela nao eh uma classe minha e sim uma classe do Seam, e o Ant nao a encontra. Alguem sabe o que fazer?