fixed unit test for exercise list

4 jobs for master in 2 minutes and 50 seconds (queued for 3 seconds)
Status Job ID Name Coverage
  Build
passed #25410
build

00:00:12

 
  Ci
passed #25412
ci_backend

00:00:26

passed #25411
ci_frontend

00:02:08

 
  Coverage
passed #25413
coverage

00:00:01

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