Add notifications of severed relationships (#27511)

spec/models/severed_relationship_spec.rb

@@ -0,0 +1,45 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+RSpec.describe SeveredRelationship do
+  let(:local_account)  { Fabricate(:account) }
+  let(:remote_account) { Fabricate(:account, domain: 'example.com') }
+  let(:event)          { Fabricate(:relationship_severance_event) }
+
+  describe '#account' do
+    context 'when the local account is the follower' do
+      let(:severed_relationship) { Fabricate(:severed_relationship, relationship_severance_event: event, local_account: local_account, remote_account: remote_account, direction: :active) }
+
+      it 'returns the local account' do
+        expect(severed_relationship.account).to eq local_account
+      end
+    end
+
+    context 'when the local account is being followed' do
+      let(:severed_relationship) { Fabricate(:severed_relationship, relationship_severance_event: event, local_account: local_account, remote_account: remote_account, direction: :passive) }
+
+      it 'returns the remote account' do
+        expect(severed_relationship.account).to eq remote_account
+      end
+    end
+  end
+
+  describe '#target_account' do
+    context 'when the local account is the follower' do
+      let(:severed_relationship) { Fabricate(:severed_relationship, relationship_severance_event: event, local_account: local_account, remote_account: remote_account, direction: :active) }
+
+      it 'returns the remote account' do
+        expect(severed_relationship.target_account).to eq remote_account
+      end
+    end
+
+    context 'when the local account is being followed' do
+      let(:severed_relationship) { Fabricate(:severed_relationship, relationship_severance_event: event, local_account: local_account, remote_account: remote_account, direction: :passive) }
+
+      it 'returns the local account' do
+        expect(severed_relationship.target_account).to eq local_account
+      end
+    end
+  end
+end