diff --git a/testsuites/psxtests/ChangeLog b/testsuites/psxtests/ChangeLog
index 4aaf5e4324..584d178b29 100644
--- a/testsuites/psxtests/ChangeLog
+++ b/testsuites/psxtests/ChangeLog
@@ -1,3 +1,10 @@
+2010-07-29	Bharath Suri <bharath.s.jois@gmail.com>
+
+	PR 1633/testing
+	* psximfs01/init.c, psximfs01/psximfs01.scn,
+	psximfs01/psximfs01.doc: New cases to exercise
+	IMFS_memfile_remove.
+
 2010-07-27	Joel Sherrill <joel.sherrill@oarcorp.com>
 
 	* psxobj01/Makefile.am, psxobj01/init.c, psxobj01/psxobj01.scn: Add
diff --git a/testsuites/psxtests/psximfs01/init.c b/testsuites/psxtests/psximfs01/init.c
index ce1c7c5669..a70cd8371b 100644
--- a/testsuites/psxtests/psximfs01/init.c
+++ b/testsuites/psxtests/psximfs01/init.c
@@ -138,6 +138,57 @@ void truncate_helper(void)
   } while (new > 0);
 }
 
+void extend_helper(void)
+{
+  off_t position;
+  off_t new;
+  off_t sc;
+  int   rc;
+
+  position = lseek( TestFd, 0, SEEK_END );
+  printf( "Seek to end .. returned %d\n", (int) position );
+  rtems_test_assert( position == 1 );
+
+  /* 
+   * test case to ftruncate a file to a length > its size 
+   */
+
+  rc = ftruncate( TestFd, 2 );
+  rtems_test_assert( rc == 0 );
+
+  puts( "lseek/ftruncate loop.." );
+  new = position;
+  do {
+    sc = lseek( TestFd, new, SEEK_SET );
+    if( sc == -1 ) {
+      if( errno == ENOSPC ) {
+	break;
+      }
+      else {
+	rtems_test_assert( 0 );
+      }
+    }
+
+    rc = ftruncate( TestFd, new );
+    if ( rc != 0 ) {
+      if( errno != ENOSPC ) {
+	fprintf(
+	  stderr,
+	  "ERROR - at offset %d - returned %d and error=%s\n",
+	  (int) new,
+	  rc,
+	  strerror( errno )
+        );
+      }
+      else {
+	break;
+      }
+    }
+    rtems_test_assert( rc == 0 );
+    ++new;
+  } while ( 1 );
+}
+
 void close_it(void)
 {
   int rc;
@@ -147,11 +198,25 @@ void close_it(void)
   rtems_test_assert( rc == 0 );
 }
 
+void unlink_it(void)
+{
+  int rc;
+
+  puts( "unlink(" FILE_NAME ") - OK" );
+  rc = unlink( FILE_NAME );
+  rtems_test_assert( rc == 0 );
+}
+
+extern Heap_Control  *RTEMS_Malloc_Heap;
+
 rtems_task Init(
   rtems_task_argument argument
 )
 {
   int i;
+  void *alloc_ptr = (void *)0;
+  Heap_Information_block Info;
+
   puts( "\n\n*** TEST IMFS 01 ***" );
 
   for (i=0 ; i<sizeof(Buffer) ; i++ )
@@ -169,8 +234,22 @@ rtems_task Init(
   
   open_it(false, false);
   truncate_helper();
+
+  /*
+   * Allocate the heap, so that extend cannot be successful
+   */
+  _Heap_Get_information( RTEMS_Malloc_Heap, &Info );
+  alloc_ptr = malloc( Info.Free.largest-4 );
+
+  extend_helper();
+
+  /* 
+   * free the allocated heap memory
+   */
+  free(alloc_ptr);
+
   close_it();
-  
+  unlink_it();
 
   puts( "*** END OF TEST IMFS 01 ***" );
 
diff --git a/testsuites/psxtests/psximfs01/psximfs01.doc b/testsuites/psxtests/psximfs01/psximfs01.doc
index 13125231a3..703c57b3c0 100644
--- a/testsuites/psxtests/psximfs01/psximfs01.doc
+++ b/testsuites/psxtests/psximfs01/psximfs01.doc
@@ -21,6 +21,7 @@ directives:
   + write
   + lseek
   + ftruncate
+  + unlink
 
 concepts:
 
@@ -33,3 +34,5 @@ ensures the maximum file size is relatively small.
 
 + This should exercise much of the singly, doubly and triply indirect
 block management code in the IMFS.
+
++ Exercise unlink, and hence IMFS_memfile_remove
diff --git a/testsuites/psxtests/psximfs01/psximfs01.scn b/testsuites/psxtests/psximfs01/psximfs01.scn
index 2d3b3877a4..0b516f8f25 100644
--- a/testsuites/psxtests/psximfs01/psximfs01.scn
+++ b/testsuites/psxtests/psximfs01/psximfs01.scn
@@ -12,5 +12,8 @@ close(biggie) - OK
 open(biggie) - OK 
 Seek to end .. returned 1280
 lseek/ftruncate loop..
+Seek to end .. returned 1
+lseek/ftruncate loop..
 close(biggie) - OK 
+unlink(biggie) - OK
 *** END OF TEST IMFS 01 ***