Why this change?
Predicate matchers are poor at providing good error messages when it
fails if all the predicate matcher does is to return a boolean. Prior to
this change, we were using `has_css? && all?` to assert for the tag
section links. There are two problems here. Firstly, when one of the matchers
fail, the error message does not provide any indication of which matcher
failed making it hard to debug failures. Secondly, the matchers were not
able to assert for the ordering of the tag section links which is an
important behaviour to assert for.
This commit changes `PageObjects::Components::Sidebar#has_tag_section_links?`
such that we make use of assertions to ensure ordering. The usage of
`all` will also provide a clear error message when things go wrong.
When a site does not have `default_navigation_menu_tags`
site setting set, anonymous users should be shown the site's top tags as
a default in the tags section. However, this regressed in 9fad71809c
and we ended up showing anonymous users a tags section with only the
`All Tags` section link.
As part of this commit, I have also refactored the QUnit acceptance
tests to system tests which are much easier to work with.
Alan Guo Xiang Tan