Add tests for problemset pages

[nickygerritsen]

We currently don't have any tests that tests whether the public/team doesn't have access to the problemset pages and linked files before contest start.

I think we should, since this can be a big security risk.

[as6325400]

The CI that checks the access permissions for each page is written where?

Is this for GitLab?

[vmcj]

The CI that checks the access permissions for each page is written where?

Is this for GitLab?

This is in webapp/tests, the PHPUnit tests.

[as6325400]

ok Thanks