Improving assert message

git-svn-id: https://svn.apache.org/repos/asf/mina/ftpserver/trunk@965128 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/core/src/test/java/org/apache/ftpserver/clienttests/PasvTest.java b/core/src/test/java/org/apache/ftpserver/clienttests/PasvTest.java
index 0ef05c0..c8dc69a 100644
--- a/core/src/test/java/org/apache/ftpserver/clienttests/PasvTest.java
+++ b/core/src/test/java/org/apache/ftpserver/clienttests/PasvTest.java
@@ -92,7 +92,7 @@
                 client.login(ADMIN_USERNAME, ADMIN_PASSWORD);
                 client.pasv();
 
-                assertTrue(client.getReplyString().indexOf(ftpIp) > -1);
+                assertTrue("Can't find " + ftpIp + " in " + client.getReplyString(), client.getReplyString().indexOf(ftpIp) > -1);
 
                 client.quit();
                 client.disconnect();