Select some text in the middle of the content - contextual toolbar should show up.
Click link icon in the contextual toolbar - link balloon should open at the position as contextual toolbar.
Close link balloon (Esc press or Cancel button) - contextual toolbar should show up.
Repeat this for backward selection.
Multiple stacks
Select some highlighted text - "View in separate stack." should show up.
Switch stacks by clicking navigation buttons. You should switch between toolbar and custom views.
Fake panels - min
Put the selection before the highlight, start moving selection by right arrow. You should see additional layer under the balloon only when at least 2 stacks are added to the balloon.
Fake panels - max
Select text [select] (by non-collapsed selection) from the lower highlight. You should see 1 of 4 status of pagination but only 2 additional layers under the balloon should be visible.
Force single view - Mention
Select text [select] (by non-collapsed selection).
Type space + @ to open mention panel. You should see mention panel with no layers under the balloon and without any counter.
Move selection around @ when leaving mention suggestions the balloon should be displayed as in above cases (layers, navigation buttons, etc).