Extract filter_keywords helper method for listing filter keyword groups

app/helpers/filters_helper.rb

@@ -1,6 +1,8 @@
 # frozen_string_literal: true
 
 module FiltersHelper
+  KEYWORDS_LIMIT = 5
+
   def filter_action_label(action)
     safe_join(
       [
@@ -9,4 +11,10 @@ module FiltersHelper
       ]
     )
   end
+
+  def filter_keywords(filter)
+    filter.keywords.map(&:keyword).take(KEYWORDS_LIMIT).tap do |list|
+      list << '…' if filter.keywords.size > KEYWORDS_LIMIT
+    end.join(', ')
+  end
 end

app/views/filters/_filter.html.haml

@@ -19,9 +19,7 @@
             .permissions-list__item__text__title
               = t('filters.index.keywords', count: filter.keywords.size)
             .permissions-list__item__text__type
-              - keywords = filter.keywords.map(&:keyword)
-              - keywords = keywords.take(5) + ['…'] if keywords.size > 5 # TODO
-              = keywords.join(', ')
+              = filter_keywords(filter)
       - unless filter.statuses.empty?
         %li.permissions-list__item
           .permissions-list__item__icon

spec/helpers/filters_helper_spec.rb

@@ -0,0 +1,24 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+RSpec.describe FiltersHelper do
+  describe '#filter_keywords' do
+    subject { helper.filter_keywords(filter) }
+
+    let(:filter) { Fabricate.build :custom_filter, keywords: }
+    let(:keywords) { words.map { |keyword| Fabricate.build(:custom_filter_keyword, keyword:) } }
+
+    context 'with few keywords' do
+      let(:words) { %w(One) }
+
+      it { is_expected.to eq('One') }
+    end
+
+    context 'with many keywords' do
+      let(:words) { %w(One Two Three Four Five Six Seven Eight Nine Ten) }
+
+      it { is_expected.to eq('One, Two, Three, Four, Five, …') }
+    end
+  end
+end