Add assertFileNotFound tag to assert taglib

git-svn-id: https://svn.apache.org/repos/asf/maven/maven-1/plugins/trunk@115594 13f79535-47bb-0310-9956-ffa450edef68

plugin/plugin.jelly

@@ -331,6 +331,14 @@
         <ant:fail>${file} does not exist.${msg}</ant:fail>
       </j:if>      
     </define:tag>
+    <define:tag name="assertFileNotFound">
+      <!-- @file : Full file path -->
+      <!-- @msg  : optional message to be displayed -->
+      <u:file var="fileAsFile" name="${file}"/>
+      <j:if test="${fileAsFile.exists()}">
+        <ant:fail>${file} found and not expected.${msg}</ant:fail>
+      </j:if>      
+    </define:tag>
     <define:tag name="assertEquals">
       <!-- @expected  : the expected value -->
       <!-- @value     : the actual value   -->