#419

backend/spec/tasks/nico_sync_spec.rb

@@ -16,8 +16,17 @@ RSpec.describe 'nico:sync' do
   end
 
   def create_nico_sanitisation_rules!
-    TagNameSanitisationRule.create!(priority: 20, source_pattern: '\\?', replacement: '_')
-    TagNameSanitisationRule.create!(priority: 40, source_pattern: '_$', replacement: '')
+    TagNameSanitisationRule.create!(priority: 20,
+                                    source_pattern: '\\?',
+                                    replacement: '_')
+
+    TagNameSanitisationRule.create!(priority: 40,
+                                    source_pattern: '_$',
+                                    replacement: '')
+
+    TagNameSanitisationRule.create!(priority: 45,
+                                    source_pattern: '^([^:]+\\:)?_',
+                                    replacement: '\\1')
   end
 
   it '既存 post を見つけて、nico tag と linked tag を追加し、差分が出たら bot を付ける' do
@@ -573,6 +582,7 @@ RSpec.describe 'nico:sync' do
 
   it 'nico: prefix を含む従来の規則で外部タグ名をサニタイズする' do
     post = create_nico_sync_post!
+    create_nico_sanitisation_rules!
 
     run_nico_sync_with_tags!(['foo:_bar'])