Build fail

[Ben Cuthbert]

When one of my unit tests fail the build is still successful. But in  
my ant config I have the following

<junit haltonfailure="yes" haltonerror="yes"  
failureproperty="tests.failures" errorproperty="tests.errors">

                                        <classpath>
                                                <path refid="classpath.test" />
                                        </classpath>

                                        <formatter type="brief" usefile="false" 
/>

                                        <batchtest fork="yes">
                                                <fileset dir="${src.tests}">
                                                        <include 
name="**/*UnitTestCase.java" />
                                                </fileset>
                                        </batchtest>
                                </junit>

test:
     [echo] running unit tests for project
    [junit] Testsuite: com.test.NetworkServerInitialisationUnitTestCase
    [junit] Tests run: 4, Failures: 0, Errors: 1, Time elapsed: 0.271  
sec
    [junit]
    [junit] Testcase: TestTheServerIsNotConnected 
(com.test.NetworkServerInitialisationUnitTestCase):	Caused an ERROR
    [junit]
    [junit] java.lang.AssertionError:
    [junit]     at org.junit.Assert.fail(Assert.java:92)
    [junit]     at org.junit.Assert.assertTrue(Assert.java:44)
    [junit]     at org.junit.Assert.assertFalse(Assert.java:69)
    [junit]     at org.junit.Assert.assertFalse(Assert.java:80)
    [junit] 	at  
com.test.NetworkServerInitialisationUnitTestCase.TestTheServerIsNotConnected 
(NetworkServerInitialisationUnitTestCase.java:77)
    default:

BUILD SUCCESSFUL
Total time: 6 seconds