Move account silence-related methods to concern (#28866)

spec/models/concerns/account/silences_spec.rb

@@ -0,0 +1,18 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+RSpec.describe Account::Silences do
+  describe 'Scopes' do
+    describe '.silenced' do
+      let(:silenced_account) { Fabricate :account, silenced: true }
+
+      before { Fabricate :account, silenced: false }
+
+      it 'returns an array of accounts who are silenced' do
+        expect(Account.silenced)
+          .to contain_exactly(silenced_account)
+      end
+    end
+  end
+end