Refactor and improve tests (#17386)

* Change account and user fabricators to simplify and improve tests

- `Fabricate(:account)` implicitly fabricates an associated `user` if
  no `domain` attribute is given (an account with `domain: nil` is
  considered a local account, but no user record was created), unless
  `user: nil` is passed
- `Fabricate(:account, user: Fabricate(:user))` should still be possible
  but is discouraged.

* Fix and refactor tests

- avoid passing unneeded attributes to `Fabricate(:user)` or
  `Fabricate(:account)`
- avoid embedding `Fabricate(:user)` into a `Fabricate(:account)` or the other
  way around
- prefer `Fabricate(:user, account_attributes: …)` to
  `Fabricate(:user, account: Fabricate(:account, …)`
- also, some tests were using remote accounts with local user records, which is
  not representative of production code.

1 files changed, 1 insertions, 1 deletions

diff --git a/spec/models/account_spec.rb b/spec/models/account_spec.rb
index 65e6714c0..681134d49 100644
--- a/spec/models/account_spec.rb
+++ b/spec/models/account_spec.rb
@@ -17,7 +17,7 @@ RSpec.describe Account, type: :model do
       end
 
       context 'when the account is of a local user' do
-        let!(:subject) { Fabricate(:account, user: Fabricate(:user, email: 'foo+bar@domain.org')) }
+        let!(:subject) { Fabricate(:user, email: 'foo+bar@domain.org').account }
 
         it 'creates a canonical domain block' do
           subject.suspend!