Add test for title prefix

app/components/blacklight/document_title_component.html.erb

@@ -1,12 +1,12 @@
 <header class="documentHeader row">
   <%= content_tag @as, class: @classes do %>
-    <% before_title.each do |t| %>
+    <% before_titles.each do |t| %>
       <%= t %>
     <% end %>
 
     <%= counter -%><%= title -%>
 
-    <% after_title.each do |t| %>
+    <% after_titles.each do |t| %>
       <%= t %>
     <% end %>
   <% end %>

app/components/blacklight/document_title_component.rb

@@ -2,8 +2,8 @@
 
 module Blacklight
   class DocumentTitleComponent < Blacklight::Component
-    renders_many :before_title
-    renders_many :after_title
+    renders_many :before_titles
+    renders_many :after_titles
     renders_many :actions
 
     # rubocop:disable Metrics/ParameterLists

spec/components/blacklight/document_component_spec.rb

@@ -156,4 +156,18 @@ def call
     component.partial { 'Partials' }
     expect(rendered).to have_content 'Partials'
   end
+
+  context 'with before_title' do
+    let(:render) do
+      component.render_in(view_context) do
+        component.title do |c|
+          c.before_title { 'Prefix!' }
+        end
+      end
+    end
+
+    it 'shows the prefix' do
+      expect(rendered).to have_content "Prefix!"
+    end
+  end
 end