Add missing whitelabeling support (#496)

Whitelabeling support was missing from `TaskLiskComponent` and the
`visually_hidden` helper.

app/components/govuk_component/task_list_component.rb

@@ -31,7 +31,7 @@ def call
   private
 
     def default_attributes
-      { class: 'govuk-task-list' }
+      { class: "#{brand}-task-list" }
     end
   end
 end

app/components/govuk_component/task_list_component/item_component.rb

@@ -64,15 +64,15 @@ def status_content
     end
 
     def default_attributes
-      { class: 'govuk-task-list__item' }
+      { class: "#{brand}-task-list__item" }
     end
 
     def title_attributes
       { text: raw_title, href:, hint: }
     end
 
     def html_attributes_with_link_class
-      html_attributes.tap { |h| h[:class].append("govuk-task-list__item--with-link") }
+      html_attributes.tap { |h| h[:class].append("#{brand}-task-list__item--with-link") }
     end
 
     def status_attributes

app/components/govuk_component/task_list_component/status_component.rb

@@ -24,8 +24,8 @@ def render?
     def default_attributes
       {
         class: class_names(
-          "govuk-task-list__status",
-          "govuk-task-list__status--cannot-start-yet" => cannot_start_yet,
+          "#{brand}-task-list__status",
+          "#{brand}-task-list__status--cannot-start-yet" => cannot_start_yet,
         ),
         id: [id_prefix, count, "status"].compact.join("-"),
       }

app/components/govuk_component/task_list_component/title_component.rb

@@ -27,15 +27,15 @@ def title_content
     def hint_content
       return if hint.blank?
 
-      tag.div(hint, class: "govuk-task-list__hint", id: hint_id)
+      tag.div(hint, class: "#{brand}-task-list__hint", id: hint_id)
     end
 
     def default_attributes
-      { class: "govuk-task-list__name-and-hint" }
+      { class: "#{brand}-task-list__name-and-hint" }
     end
 
     def link_attributes
-      { class: "govuk-task-list__link", **aria_described_by_attributes }
+      { class: "#{brand}-task-list__link", **aria_described_by_attributes }
     end
 
     def aria_described_by_attributes

app/helpers/govuk_visually_hidden_helper.rb

@@ -2,7 +2,13 @@ module GovukVisuallyHiddenHelper
   def govuk_visually_hidden(text = nil, &block)
     return if text.blank? && block.nil?
 
-    tag.span(text, class: "govuk-visually-hidden", &block)
+    tag.span(text, class: "#{brand}-visually-hidden", &block)
+  end
+
+private
+
+  def brand
+    Govuk::Components.brand
   end
 end
 

spec/components/govuk_component/task_list_component_spec.rb

@@ -371,4 +371,5 @@
 
   it_behaves_like 'a component that accepts custom classes'
   it_behaves_like 'a component that accepts custom HTML attributes'
+  it_behaves_like 'a component that supports custom branding'
 end

spec/helpers/govuk_visually_hidden_helper_spec.rb

@@ -21,5 +21,23 @@
 
       it { is_expected.to have_tag('span', with: { class: "govuk-visually-hidden" }, text: "first item") }
     end
+
+    context 'when a custom brand is set' do
+      let(:custom_brand) { 'globex-corp' }
+
+      before do
+        Govuk::Components.configure do |conf|
+          conf.brand = custom_brand
+        end
+      end
+
+      after do
+        Govuk::Components.reset!
+      end
+
+      subject { govuk_visually_hidden("first item") }
+
+      it { is_expected.to have_tag('span', with: { class: "#{custom_brand}-visually-hidden" }) }
+    end
   end
 end