+the yaffs_open function has been covered by tests
+the yaffs_close function has been covered by tests
+
+tests made
+ test_yaffs_mount
+ test_yaffs_access
+ test_yaffs_close
+ test_yaffs_close_EBADF
+ test_yaffs_ftruncate
+ test_yaffs_lseek
+ test_yaffs_open
+ test_yaffs_open_EEXIST
+ test_yaffs_open_EISDIR
+ test_yaffs_open_ENAMETOOLONG
+ test_yaffs_open_ENOENT
+ test_yaffs_open_ENOTDIR
+ test_yaffs_read
+ test_yaffs_stat
+ test_yaffs_truncate
+ test_yaffs_unlink_EISDIR
+ test_yaffs_unlink_ENAMETOOLONG
+ test_yaffs_unlink_ENOENT
+ test_yaffs_unlink_ENOTDIR
+ test_yaffs_write
+tests to add
+ test_yaffs_mount_EACCES
+ test_yaffs_mount_EINVAL
+ test_yaffs_mount_ELOOP
+ test_yaffs_mount_EMFILE
+ test_yaffs_mount_ENAMETOOLONG
+ test_yaffs_mount_ENOENT
+ test_yaffs_mount_ENOTDIR
+ test_yaffs_open_EACCES
+ test_yaffs_open_ENOSPC
+ test_yaffs_open_ELOOP Too many symbolic links were encountered in resolving pathname
+ test_yaffs_close
+ test yaffs_open_running_out_of_handles error
+ test_yaffs_unlink_EACCES
+ test_yaffs_unlink_ELOOP
+ test_yaffs_unlink_ENOENT
+ test_yaffs_unlink_ENOMEM
+ check to see if an error code is generated when there isn't an error
+ test_yaffs_access_EACCESS
+ test_yaffs_access_ELOOP
+ test_yaffs_access_ENAMETOOLONG
+ test_yaffs_access_ENOENT
+ test_yaffs_access_ENOTDIR
+ test_yaffs_access_ENIVAL //mode is incorrect.