sqlserver function cast and splicing

Today the project uses sqlserver, and it has been 8 years without this sqlserver.
I want to insert some data into a table in a loop.
So:
--identity(1,1) self-increment
create talbe test(id int identity(1,1) primary key ,data varchar(50));

declear @i int,@m varchar(10)
set @i=0
while @i<100
--cast type conversion function, + splicing string
begin set @m='test' + cast(@i as varchar(10))
insert into test(data) values ​​(@m);
set @ i=@i+1
end