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/controllers/api/v1/admin/reports_controller_spec.rb b/spec/controllers/api/v1/admin/reports_controller_spec.rb
index 4ed3c5dc4..b6df53048 100644
--- a/spec/controllers/api/v1/admin/reports_controller_spec.rb
+++ b/spec/controllers/api/v1/admin/reports_controller_spec.rb
@@ -4,7 +4,7 @@ RSpec.describe Api::V1::Admin::ReportsController, type: :controller do
   render_views
 
   let(:role)   { 'moderator' }
-  let(:user)   { Fabricate(:user, role: role, account: Fabricate(:account, username: 'alice')) }
+  let(:user)   { Fabricate(:user, role: role) }
   let(:scopes) { 'admin:read admin:write' }
   let(:token)  { Fabricate(:accessible_access_token, resource_owner_id: user.id, scopes: scopes) }
   let(:report) { Fabricate(:report) }