FEATURE: Remap group mentions when group name has been changed.

spec/services/group_mentions_updater_spec.rb

@@ -0,0 +1,39 @@
+require 'rails_helper'
+
+RSpec.describe GroupMentionsUpdater do
+  let(:post) { Fabricate(:post) }
+
+  describe '.update' do
+    it 'should update valid group mentions' do
+      new_group_name = 'awesome_team'
+      old_group_name = 'team'
+
+      [
+        ["@#{old_group_name} is awesome!", "@#{new_group_name} is awesome!"],
+        ["This @#{old_group_name} is awesome!", "This @#{new_group_name} is awesome!"],
+        ["Mention us @ @#{old_group_name}", "Mention us @ @#{new_group_name}"],
+      ].each do |raw, expected_raw|
+        group = Fabricate(:group, name: old_group_name)
+        post.update!(raw: raw)
+        group.update!(name: new_group_name)
+        post.reload
+
+        expect(post.raw_mentions).to eq([new_group_name])
+        expect(post.raw).to eq(expected_raw)
+
+        group.destroy!
+      end
+    end
+
+    it 'should not update invalid group mentions' do
+      group = Fabricate(:group, name: 'team')
+      post.update!(raw: 'This is not valid@team.com')
+
+      expect(post.reload.raw_mentions).to eq([])
+
+      group.update!(name: 'new_team_name')
+
+      expect(post.reload.raw_mentions).to eq([])
+    end
+  end
+end