While running our test suite, we were getting an exception sometimes:
```
Proposal Notifications In-app notifications from the proposal's author Followers should receive a notification
Failure/Error: notification_for_user2 = Notification.find_by(user: user2)
ActiveRecord::StatementInvalid:
PG::ProtocolViolation: ERROR: bind message supplies 0 parameters, but prepared statement "" requires 2
: SELECT "notifications".* FROM "notifications" WHERE "notifications"."user_id" = $1 LIMIT $2
# ./spec/system/proposal_notifications_spec.rb:268
```
Sometimes we were getting a similar exception in a different test:
```
Commenting legislation questions Merged comment threads Reply on a multiple annotation thread and display it in the single annotation thread
And sometimes we were getting a different one:
Failure/Error: annotation.comments.roots.sort_by_most_voted.limit(Legislation::Annotation::COMMENTS_PAGE_SIZE).each do |comment|
ActionView::Template::Error:
PG::ProtocolViolation: ERROR: bind message supplies 0 parameters, but prepared statement "" requires 3
```
My best (wild) guess is these exceptions might take place because the
test is accessing the database and at the same time the browser
(chromedriver) process is accessing the database, with code like:
```
find(".icon-notification").click
notification_for_user2 = Notification.find_by(user: user2)
```
Or:
```
first(:css, ".annotator-hl").click
(...)
comment = annotation1.comments.first
click_link "Reply"
```
This behavior happened sometimes while using transactional fixtures and
a shared database connection with feature specs (before system specs
were introduced in Rails 5.1) when some queries were triggered from the
test after the browser process was started.
So we're avoiding the situation by writing the tests from the user's
point of view. This is just an attempt at fixing the issue; I don't know
whether these changes will fix it since I've only seen this exception on
Github Actions (never on my machine). Worst case scenario, we're still
improving the tests legibililty.
d8f1c462de