Fixed a broken test

src/etc/testcases/core/dispatch/dispatch.xml

@@ -19,14 +19,13 @@
 <project name="dispatch-test" default="disp">
 
   <path id="testclasses">
-    <pathelement location="../../../../build/testcases" />
-    <pathelement path="${java.class.path}" />
+    <pathelement location="${build.tests.value}"/>
+    <pathelement path="${java.class.path}"/>
   </path>
 
   <target name="disp">
-    <taskdef name="disptask"
-             classname="org.apache.tools.ant.taskdefs.PickOneTask">
-      <classpath refid="testclasses" />
+    <taskdef name="disptask" classname="org.apache.tools.ant.PickOneTask">
+      <classpath refid="testclasses"/>
     </taskdef>
     <disptask action="list"/>
   </target>

src/tests/junit/org/apache/tools/ant/DispatchTaskTest.java

@@ -21,19 +21,28 @@ package org.apache.tools.ant;
 import org.junit.Before;
 import org.junit.Rule;
 import org.junit.Test;
+import org.junit.rules.ExpectedException;
+
+import static org.junit.Assert.assertNotNull;
 
 public class DispatchTaskTest {
 
     @Rule
     public BuildFileRule buildRule = new BuildFileRule();
 
+    @Rule
+    public ExpectedException thrown = ExpectedException.none();
+
     @Before
     public void setUp() {
+        assertNotNull("build.tests.value not set", System.getProperty("build.tests.value"));
         buildRule.configureProject("src/etc/testcases/core/dispatch/dispatch.xml");
     }
 
-    @Test(expected = BuildException.class)
+    @Test
     public void testDisp() {
-            buildRule.executeTarget("disp");
+        thrown.expect(BuildException.class);
+        thrown.expectMessage("list");
+        buildRule.executeTarget("disp");
     }
 }