How use variable in the case statement

Variable in Simple CASE expression

 

  DECLARE @TestVal int

SET @TestVal = 3

SELECT

        CASE @TestVal

               WHEN 1 THEN 'First'

               WHEN 2 THEN 'Second'

               WHEN 3 THEN 'Third'

               ELSE 'Other'

        END

 

Variable in search case expression

DECLARE @TestVal int

SET @TestVal = 5

SELECT

        CASE

                WHEN @TestVal <=3 THEN 'Top 3'

               ELSE 'Other'

        END