Send issue due emails to all participants

app/services/notification_recipient_service.rb

@@ -230,7 +230,7 @@ module NotificationRecipientService
         add_subscribed_users
-        if [:new_issue, :new_merge_request, :due_date_issue].include?(custom_action)
+        if [:new_issue, :new_merge_request].include?(custom_action)
           # These will all be participants as well, but adding with the :mention
           # type ensures that users with the mention notification level will
           # receive them, too.
@@ -238,7 +238,7 @@ module NotificationRecipientService
           # Add the assigned users, if any
           assignees = case custom_action
-                      when :new_issue, :due_date_issue
+                      when :new_issue
                         target.assignees
                       else
                         target.assignee

app/services/notification_service.rb

@@ -363,7 +363,7 @@ class NotificationService
     end
   end
-  def issue_due_email(issue)
+  def issue_due(issue)
     recipients = NotificationRecipientService.build_recipients(
       issue,
       issue.author,

spec/services/notification_recipient_service_spec.rb

-require 'spec_helper'
-
-describe NotificationRecipientService do
-  describe 'build_recipients' do
-    it 'due_date' do
-      # These folks are being filtered out because they can't receive notifications
-      # notification_recipient.rb#85
-      user = create(:user)
-      assignee = create(:user)
-      issue = create(:issue, :opened, due_date: Date.today, author: user, assignees: [assignee])
-
-      recipients = described_class.build_recipients(
-        issue,
-        issue.author,
-        action: "due_date",
-        skip_current_user: false
-      )
-
-      expect(recipients).to match_array([user, assignee])
-    end
-  end
-end

spec/services/notification_service_spec.rb

@@ -933,6 +933,37 @@ describe NotificationService, :mailer do
         let(:notification_trigger) { notification.issue_moved(issue, new_issue, @u_disabled) }
       end
     end
+
+    describe '#issue_due' do
+      it 'sends email to issue notification recipients' do
+        notification.issue_due(issue)
+
+        should_email(issue.assignees.first)
+        should_email(issue.author)
+        should_email(@u_watcher)
+        should_email(@u_guest_watcher)
+        should_email(@u_participant_mentioned)
+        should_email(@subscriber)
+        should_email(@watcher_and_subscriber)
+        should_not_email(@unsubscriber)
+        should_not_email(@u_participating)
+        should_not_email(@u_disabled)
+        should_not_email(@u_lazy_participant)
+      end
+
+      it 'sends the email from the author' do
+        notification.issue_due(issue)
+        email = find_email_for(@subscriber)
+
+        expect(email.header[:from].display_names).to eq([issue.author.name])
+      end
+
+      it_behaves_like 'participating notifications' do
+        let(:participant) { create(:user, username: 'user-participant') }
+        let(:issuable) { issue }
+        let(:notification_trigger) { notification.issue_due(issue) }
+      end
+    end
   end
   describe 'Merge Requests' do