Merge branch 'use-build-in-broadcast-message-spec' into 'master'

Use build instead create in BroadcastMessage model spec

See merge request !7592

spec/models/broadcast_message_spec.rb

 require 'spec_helper'
 describe BroadcastMessage, models: true do
-  subject { create(:broadcast_message) }
+  subject { build(:broadcast_message) }
   it { is_expected.to be_valid }