Please fill in the following information:

Issue description

the lab grade script is not checking that what the student did is working, but the syntax that was used. 

Steps to reproduce:

Instructions: Create the cron job and configure it to run every minute.

Student used: `schedule: "* * * * *"`
The lab grade script fails at that step

The solution says: `schedule: "*/1 * * * *"`

Workaround:

Expected result: