Use assert taglib in plugin test

git-svn-id: https://svn.apache.org/repos/asf/maven/maven-1/plugins/trunk@115595 13f79535-47bb-0310-9956-ffa450edef68

changes/src/plugin-test/maven.xml

@@ -16,7 +16,8 @@
  */
  -->
 <project xmlns:util="jelly:util"
-         xmlns:j="jelly:core">
+         xmlns:j="jelly:core"
+         xmlns:assert="assert">
          
   <goal name="testPlugin" prereqs="test-changes-report">
     <attainGoal name="clean"/>
@@ -24,10 +25,6 @@
   
   <goal name="test-changes-report">
     <attainGoal name="changes:report"/>
-    <j:set var="expectedFile" value="${maven.gen.docs}/changes-report.xml"/>
-    <util:file var="file" name="${expectedFile}" />
-    <j:if test="${!(file.exists())}">
-      <fail>${expectedFile} not generated</fail>
-    </j:if>
+    <assert:assertFileExists file="${maven.gen.docs}/changes-report.xml"/>
   </goal>
 </project>