system sh/stop_dnodes.sh
system sh/deploy.sh -n dnode1 -i 1
system sh/exec.sh -n dnode1 -s start
sql connect

print ============= step1
sql create user u_read pass 'taosdata1'
sql create user u_write pass 'taosdata1'

sql alter user u_read pass 'taosdata'
sql alter user u_write pass 'taosdata'

sql show users
if $rows != 3 then 
  return -1
endi

print ============= step2
sql close
sleep 2500
print user u_read login
sql connect u_read
sql alter user u_read pass 'taosdata'
sql alter user u_write pass 'taosdata1' -x step2
  return -1
step2:

sql_error create user read1 pass 'taosdata1'
sql_error create user write1 pass 'taosdata1'

sql show users
if $rows != 3 then 
  return -1
endi

print ============= step3
sql close
sleep 2500
print user u_write login
sql connect u_write

sql_error create user read2 pass 'taosdata1'
sql_error create user write2 pass 'taosdata1'
sql alter user u_write pass 'taosdata'
sql alter user u_read pass 'taosdata' -x step3
  return -1
step3:

sql show users
if $rows != 3 then 
  return -1
endi

print ============= step4
sql close 
sleep 2500
print user root login
sql connect
sql create user oroot pass 'taosdata'

sql show users
if $rows != 4 then 
  return -1
endi

system sh/exec.sh -n dnode1 -s stop -x SIGINT