We were repeating the same code over and over (with a few variants) to
setup tests which require an administrator. We can use a tag and
simplify the code.
By default, Capybara only finds visible elements, so adding the
`visible: true` option is usually redundant.
We were using it sometimes to make it an obvious contrast with another
test using `visible: false`. However, from the user's perspective, we
don't care whether the element has been removed from the DOM or has been
hidden, so we can just test that the visible selector can't be found.
Besides, using `visible: false` means the test will also pass if the
element is present and visible. However, we want the test to fail if the
element is visible. That's why a couple of JavaScript-dependant tests
were passing even when JavaScript was disabled.
When a user replies to a comment whose responses was hidden at the
moment of reply form submission and although the reply were correctly
added to the DOM it was hidden because was added to a collapsed list.
This solution is about showing all responses of parent comment after adding
the new comment to the DOM so the user can see new reply into the screen.
(This is not applicable to root comments which cannot be collapsed)
Extract the needed portion of code to a new partial to be able to update
only the elements needed when a new comment is added keeping UI properly
updated.
Tests are also a bit easier to read, even though we need to use the
`text:` option to find links because otherwise the text in the hidden
`<span>` tags will cause `click_link` to miss the link we want to click.
Here's an explanation by one of Capybara's authors:
https://github.com/teamcapybara/capybara/issues/2347#issuecomment-626373440
