Plural reason(s)

app/mailers/emails/merge_requests.rb

@@ -59,7 +59,7 @@ module Emails
     def merge_request_unmergeable_email(recipient_id, merge_request_id, reason = nil)
       setup_merge_request_mail(merge_request_id, recipient_id)
 
-      @merge_request_presenter = MergeRequestPresenter.new(@merge_request, current_user: current_user)
+      @reasons = MergeRequestPresenter.new(@merge_request, current_user: current_user).unmergeable_reasons
 
       mail_answer_thread(@merge_request, merge_request_thread_options(@merge_request.author_id, recipient_id, reason))
     end

app/views/notify/merge_request_unmergeable_email.html.haml

 %p
-  Merge Request #{link_to @merge_request.to_reference, project_merge_request_url(@merge_request.target_project, @merge_request)} can no longer be merged due to the following reason(s):
+  Merge Request #{link_to @merge_request.to_reference, project_merge_request_url(@merge_request.target_project, @merge_request)} can no longer be merged due to the following #{pluralize(@reasons, 'reason')}:
 
   %ul
-    - @merge_request_presenter.unmergeable_reasons.each do |reason|
+    - @reasons.each do |reason|
       %li= reason

app/views/notify/merge_request_unmergeable_email.text.haml

-Merge Request #{@merge_request.to_reference} can no longer be merged due to the following reason(s):
+Merge Request #{@merge_request.to_reference} can no longer be merged due to the following #{pluralize(@reasons, 'reason')}:
 
-- @merge_request_presenter.unmergeable_reasons.each do |reason|
+- @reasons.each do |reason|
   * #{reason}
 
 Merge Request url: #{project_merge_request_url(@merge_request.target_project, @merge_request)}

spec/mailers/notify_spec.rb

@@ -422,6 +422,7 @@ describe Notify do
           aggregate_failures do
             is_expected.to have_referable_subject(merge_request, reply: true)
             is_expected.to have_body_text(project_merge_request_path(project, merge_request))
+            is_expected.to have_body_text('reasons:')
             reasons.each do |reason|
               is_expected.to have_body_text(reason)
             end