SQL> select * from v$version;

BANNER
------------------------------------------------------------
Oracle Database 11g Enterprise Edition Release 11.1.0.7.0 - 64bit Production
PL/SQL Release 11.1.0.7.0 - Production
CORE    11.1.0.7.0      Production
TNS for IBM/AIX RISC System/6000: Version 11.1.0.7.0 - Production
NLSRTL Version 11.1.0.7.0 - Production



select tablespace_name, dump(tablespace_name) from dba_tablespaces

TABLESPACE_NAME
------------------------------
DUMP(TABLESPACE_NAME)
---------------------------------------------------------------
test
Typ=1 Len=4: 116,101,115,116


SQL> show user;
USER is "SYS"
SQL> drop tablespace test including contents and datafiles;
drop tablespace test including contents and datafiles
*
ERROR at line 1:
ORA-00959: tablespace 'TEST' does not exist


SQL>  drop tablespace 'test' including contents and datafiles;
 drop tablespace 'test' including contents and datafiles
                 *
ERROR at line 1:
ORA-02216: tablespace name expected


SQL> drop tablespace TEST including contents and datafiles;
drop tablespace TEST including contents and datafiles
*
ERROR at line 1:
ORA-00959: tablespace 'TEST' does not exist