In the officing tests, we were accessing `admin.user` after starting the
browser with a `visit`. However, since `admin` is a method with a `let`
block, the administrator isn't created in the database until we
referenced the variable, meaning we were creating the database record in
the middle of the test. Referencing the variable at the beginning of the
test solves the issue.
We were also creating records to call the `login_as` method in the users
tests, so we're moving the code to create them before the first call to
`visit`.
In the notifiable test, we were doing a loop consisting of "create()" ->
"visit" -> "create()" -> "visit!" -> (...), meaning we were creating the
second user after the first `visit`. Creating every user before the
first `visit` solves the issue.
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