The test setup was slightly refactored to be more general about
the type of the popup.
The additional reference links on the test page were added mostly
to be prepared for further tests of more complex cases.
On the CI the tests should be executed with having reference
popups enabled. The code tries to skip test when the feature is
disabled.
See I17687c62cc8d738a4eb41738c9ce6662a5ec68d8
and I1eb7409aa3bd111c2e461dfe245d95f7e78d416c
Bug: T213415
Change-Id: I74110c6227596ff10c75f5f0b0da3d952f11a239
