how many items are there is not a matter to write the test 
case here we mention th field:

Test case objective: check for sorting 
description:check for sorting of the "field name"
Expected result:items should be sorted as "by name"

this much description is enough we need to mention based on 
which field did it be sorted ok

yes we can write.

1. By name
step1:enter the name(whose we sort)
step2:click the sort or submit button.
      or press the enter button.
step3:sort name is shown(when the name is available in the 
list)

2.By code
step1:enter the code(ie dept code,emp code etc)
step2:click the sort or submit button.
      or press the enter button.
step3:details are shown(when the code is valid)

Negative test cases should also be covered while authoring 
test cases  

for eg What happens if sorting of the items are not done 
properly....