try to figure out why this keeps failing in Gump

git-svn-id: https://svn.apache.org/repos/asf/ant/antlibs/svn/trunk@1154184 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/src/tests/junit/org/apache/ant/svn/SvnChangeLogTaskTest.java b/src/tests/junit/org/apache/ant/svn/SvnChangeLogTaskTest.java
index 389cb70..d385190 100644
--- a/src/tests/junit/org/apache/ant/svn/SvnChangeLogTaskTest.java
+++ b/src/tests/junit/org/apache/ant/svn/SvnChangeLogTaskTest.java
@@ -86,7 +86,8 @@
 
     private static final void assertRev161885(String log) {
         int rev = log.indexOf("<revision>161885</revision>");
-        Assert.assertTrue(rev > -1);
+        Assert.assertTrue("Expected to find revision 161885, but log was "
+                          + log, rev > -1);
         int entryBeforeRev = log.lastIndexOf("<entry>", rev);
         int entryAfterRev = log.indexOf("</entry>", rev);