Test convenience: more error output.
diff --git a/testplugins/org.eclipse.objectteams.otdt.tests/src/org/eclipse/objectteams/otdt/tests/FileBasedTest.java b/testplugins/org.eclipse.objectteams.otdt.tests/src/org/eclipse/objectteams/otdt/tests/FileBasedTest.java
index f2f7839..93e9d40 100644
--- a/testplugins/org.eclipse.objectteams.otdt.tests/src/org/eclipse/objectteams/otdt/tests/FileBasedTest.java
+++ b/testplugins/org.eclipse.objectteams.otdt.tests/src/org/eclipse/objectteams/otdt/tests/FileBasedTest.java
@@ -284,6 +284,8 @@
                 || expected == null
                 || actual.length != expected.length)
         {
+        	System.out.println("Length mismatch: expected "+(expected == null ? "null" : expected.length)+
+        						" but got "+(actual == null ? "null" : actual.length));
             return false;
         }