Index: trunk/psLib/test/collections/tst_psPixels.c
===================================================================
--- trunk/psLib/test/collections/tst_psPixels.c	(revision 4153)
+++ trunk/psLib/test/collections/tst_psPixels.c	(revision 4155)
@@ -5,7 +5,7 @@
  *  @author Robert DeSonia, MHPCC
  *
- *  @version $Revision: 1.5 $
+ *  @version $Revision: 1.6 $
  *           $Name: not supported by cvs2svn $
- *  @date $Date: 2005-06-08 19:28:59 $
+ *  @date $Date: 2005-06-08 19:48:15 $
  *
  *  Copyright 2005 Maui High Performance Computing Center, University of Hawaii
@@ -488,4 +488,10 @@
     }
 
+    // Attempt to concatenate with NULL pixels
+    psLogMsg(__func__,PS_LOG_INFO,"Following should generate an error message for NULL pixels");
+    if(psPixelsConcatenate(pixels2,NULL) != NULL) {
+        psError(PS_ERR_UNKNOWN,true,"Did not expect return to be non-NULL for NULL input pixels");
+        return 12;
+    }
 
     psFree(pixels3);