Merge branch '15332-add-draft-status-change-email' into 'master'

Add mail templates for changes in MR draft status

See merge request gitlab-org/gitlab!54870

app/views/notify/change_in_merge_request_draft_status_email.html.haml

+%p
+  = _('%{username} changed the draft status of merge request %{mr_reference}' % {username: sanitize_name(@updated_by_user.name), mr_reference: @merge_request.to_reference })

app/views/notify/change_in_merge_request_draft_status_email.text.erb

+<%= "#{sanitize_name(@updated_by_user.name)} changed the draft status of merge request #{@merge_request.to_reference}" %>

changelogs/unreleased/15332-add-draft-status-change-email.yml

+---
+title: Add notification templates for merge request draft/WIP status change events
+merge_request: 54870
+author:
+type: other

spec/views/notify/change_in_merge_request_draft_status_email.html.haml_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe 'notify/change_in_merge_request_draft_status_email.html.haml' do
+  let(:user) { create(:user) }
+  let(:merge_request) { create(:merge_request) }
+
+  before do
+    assign(:updated_by_user, user)
+    assign(:merge_request, merge_request)
+  end
+
+  it 'renders the email correctly' do
+    render
+
+    expect(rendered).to have_content("#{user.name} changed the draft status of merge request #{merge_request.to_reference}")
+  end
+end

spec/views/notify/change_in_merge_request_draft_status_email.text.erb_spec.rb

+# frozen_string_literal: true
+require 'spec_helper'
+
+RSpec.describe 'notify/change_in_merge_request_draft_status_email.text.erb' do
+  let(:user) { create(:user) }
+  let(:merge_request) { create(:merge_request) }
+
+  before do
+    assign(:updated_by_user, user)
+    assign(:merge_request, merge_request)
+  end
+
+  it_behaves_like 'renders plain text email correctly'
+
+  it 'renders the email correctly' do
+    render
+
+    expect(rendered).to have_content("#{user.name} changed the draft status of merge request #{merge_request.to_reference}")
+  end
+end