validate length of label.title

+ add test for label.title length validation

app/models/label.rb

@@ -26,6 +26,7 @@ class Label < ActiveRecord::Base
   # Don't allow ',' for label titles
   validates :title, presence: true, format: { with: /\A[^,]+\z/ }
   validates :title, uniqueness: { scope: [:group_id, :project_id] }
+  validates :title, length: { maximum: 255 }
 
   default_scope { order(title: :asc) }
 

changelogs/unreleased/validate-title-length.yml

+---
+title: "Validate label's title length"
+merge_request: 5767
+author: Tomáš Kukrál

spec/models/label_spec.rb

@@ -31,12 +31,14 @@ describe Label, models: true do
     it 'validates title' do
       is_expected.not_to allow_value('G,ITLAB').for(:title)
       is_expected.not_to allow_value('').for(:title)
+      is_expected.not_to allow_value('s' * 256).for(:title)
 
       is_expected.to allow_value('GITLAB').for(:title)
       is_expected.to allow_value('gitlab').for(:title)
       is_expected.to allow_value('G?ITLAB').for(:title)
       is_expected.to allow_value('G&ITLAB').for(:title)
       is_expected.to allow_value("customer's request").for(:title)
+      is_expected.to allow_value('s' * 255).for(:title)
     end
   end