+ test_yaffs_ftruncate_EACCES
+ test_yaffs_ftruncate_EFBIG
+ test_yaffs_ftruncate_ENIVAL
+ test_yaffs_ftruncate_EISDIR
+ test_yaffs_ftruncate_ELOOP
+ test_yaffs_ftruncate_ENOENT
+ test_yaffs_ftruncate_ENOTDIR
+ test_yaffs_ftruncate_EPERM
+
+ test_yaffs_truncate_EACCES
+ test_yaffs_truncate_EFBIG
+ test_yaffs_truncate_ENIVAL
+ test_yaffs_truncate_EISDIR
+ test_yaffs_truncate_ELOOP
+ test_yaffs_truncate_ENAMETOOLONG
+ test_yaffs_truncate_ENOENT
+ test_yaffs_truncate_ENOTDIR
+ test_yaffs_truncate_EPERM
+
+ check to see if an error code is generated when there isn't an error.
+