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Setup
Access as admin.
Create a course with group mode = "visible groups".
Enrol some students.
DO NOT CREATE ANY GROUPS.
Testing scenario 1
Access as student to the course.
Go to participants page.
CHECK that there isn't any "2:0" default filter.
Testing scenario 2
Access as admin or teacher
Create a group named "XXXX"
Add some students to this group.
Access as student to the course.
Go to participants page.
CHECK that there is a "Group: XXXX" filter and only the participants of this group are displayed.