Katie Koerner, Riley Cooper and Bo Khongkhatitham rehearse for 'This is a Test' at Douglas High School. DHS Tigers on Stage present the 'This is a Test' one-act play by Stephen Greg and improv show, 7:30 p.m. today, and 4 p.m. and 7:30 p.m. Saturday, at Douglas High School. Cost is $5. Saturday matinee is a 2-for-1 ticket price.