Add email to encourage group creator to invite their teammates

Add Gitlab::Email::Message::InProductMarketingEmail::InviteTeam. This
email message is sent to a group creator 20 minutes after they create
the group to encourage them to invite their teammates.

app/views/notify/in_product_marketing_email.html.haml

@@ -166,6 +166,7 @@
                         = about_link('mailers/in_product_marketing/gitlab-logo-gray-rgb.png', 200)
                     %tr
                       %td{ "aria-hidden" => "true", height: "30", style: "font-size: 0; line-height: 0;" }
+                    - if @message.series?
                       %tr{ style: "background-color: #ffffff;" }
                         %td{ style: "color: #424242; padding: 10px 30px; text-align: center; font-family: 'Source Sans Pro', helvetica, arial, sans-serif;font-size: 16px; line-height: 22px; border: 1px solid #dddddd" }
                           %p

lib/gitlab/email/message/in_product_marketing.rb

@@ -7,7 +7,8 @@ module Gitlab
         UnknownTrackError = Class.new(StandardError)
 
         def self.for(track)
-          raise UnknownTrackError unless Namespaces::InProductMarketingEmailsService::TRACKS.key?(track)
+          valid_tracks = [:invite_team, Namespaces::InProductMarketingEmailsService::TRACKS.keys].flatten
+          raise UnknownTrackError unless valid_tracks.include?(track)
 
           "Gitlab::Email::Message::InProductMarketing::#{track.to_s.classify}".constantize
         end

lib/gitlab/email/message/in_product_marketing/base.rb

@@ -12,12 +12,12 @@ module Gitlab
           attr_accessor :format
 
           def initialize(group:, user:, series:, format: :html)
-            raise ArgumentError, "Only #{total_series} series available for this track." unless series.between?(0, total_series - 1)
-
+            @series = series
             @group = group
             @user = user
-            @series = series
             @format = format
+
+            validate_series!
           end
 
           def subject_line
@@ -115,6 +115,10 @@ module Gitlab
             ["mailers/in_product_marketing", "#{track}-#{series}.png"].join('/')
           end
 
+          def series?
+            total_series > 0
+          end
+
           protected
 
           attr_reader :group, :user, :series
@@ -171,6 +175,12 @@ module Gitlab
               e.run
             end
           end
+
+          def validate_series!
+            return unless series?
+
+            raise ArgumentError, "Only #{total_series} series available for this track." unless @series.between?(0, total_series - 1)
+          end
         end
       end
     end

lib/gitlab/email/message/in_product_marketing/invite_team.rb

+# frozen_string_literal: true
+
+module Gitlab
+  module Email
+    module Message
+      module InProductMarketing
+        class InviteTeam < Base
+          def subject_line
+            s_('InProductMarketing|Invite your teammates to GitLab')
+          end
+
+          def tagline
+            ''
+          end
+
+          def title
+            s_('InProductMarketing|GitLab is better with teammates to help out!')
+          end
+
+          def subtitle
+            ''
+          end
+
+          def body_line1
+            s_('InProductMarketing|Invite your teammates today and build better code together. You can even assign tasks to new teammates such as setting up CI/CD, to help get projects up and running.')
+          end
+
+          def body_line2
+            ''
+          end
+
+          def cta_text
+            s_('InProductMarketing|Invite your teammates to help')
+          end
+
+          def logo_path
+            'mailers/in_product_marketing/team-0.png'
+          end
+
+          def series?
+            false
+          end
+        end
+      end
+    end
+  end
+end

locale/gitlab.pot

@@ -17604,6 +17604,9 @@ msgstr ""
 msgid "InProductMarketing|GitHub Enterprise projects to GitLab"
 msgstr ""
 
+msgid "InProductMarketing|GitLab is better with teammates to help out!"
+msgstr ""
+
 msgid "InProductMarketing|GitLab provides static application security testing (SAST), dynamic application security testing (DAST), container scanning, and dependency scanning to help you deliver secure applications along with license compliance."
 msgstr ""
 
@@ -17679,6 +17682,15 @@ msgstr ""
 msgid "InProductMarketing|Invite your team today to build better code (and processes) together"
 msgstr ""
 
+msgid "InProductMarketing|Invite your teammates to GitLab"
+msgstr ""
+
+msgid "InProductMarketing|Invite your teammates to help"
+msgstr ""
+
+msgid "InProductMarketing|Invite your teammates today and build better code together. You can even assign tasks to new teammates such as setting up CI/CD, to help get projects up and running."
+msgstr ""
+
 msgid "InProductMarketing|It's all in the stats"
 msgstr ""
 

spec/lib/gitlab/email/message/in_product_marketing/base_spec.rb

@@ -82,4 +82,29 @@ RSpec.describe Gitlab::Email::Message::InProductMarketing::Base do
       it { is_expected.to include('This is email 1 of 3 in the Create series', Gitlab::Routing.url_helpers.profile_notifications_url) }
     end
   end
+
+  describe '#series?' do
+    using RSpec::Parameterized::TableSyntax
+
+    subject do
+      test_class = "Gitlab::Email::Message::InProductMarketing::#{track.to_s.classify}".constantize
+      test_class.new(group: group, user: user, series: series).series?
+    end
+
+    where(:track, :result) do
+      :create       | true
+      :team_short   | true
+      :trial_short  | true
+      :admin_verify | true
+      :verify       | true
+      :trial        | true
+      :team         | true
+      :experience   | true
+      :invite_team  | false
+    end
+
+    with_them do
+      it { is_expected.to eq result }
+    end
+  end
 end

spec/lib/gitlab/email/message/in_product_marketing/invite_team_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe Gitlab::Email::Message::InProductMarketing::InviteTeam do
+  let_it_be(:group) { build(:group) }
+  let_it_be(:user) { build(:user) }
+
+  subject(:message) { described_class.new(group: group, user: user, series: 0) }
+
+  it 'contains the correct message', :aggregate_failures do
+    expect(message.subject_line).to eq 'Invite your teammates to GitLab'
+    expect(message.tagline).to be_empty
+    expect(message.title).to eq 'GitLab is better with teammates to help out!'
+    expect(message.subtitle).to be_empty
+    expect(message.body_line1).to eq 'Invite your teammates today and build better code together. You can even assign tasks to new teammates such as setting up CI/CD, to help get projects up and running.'
+    expect(message.body_line2).to be_empty
+    expect(message.cta_text).to eq 'Invite your teammates to help'
+    expect(message.logo_path).to eq 'mailers/in_product_marketing/team-0.png'
+  end
+end

spec/lib/gitlab/email/message/in_product_marketing_spec.rb

@@ -11,9 +11,14 @@ RSpec.describe Gitlab::Email::Message::InProductMarketing do
     context 'when track exists' do
       where(:track, :expected_class) do
         :create       | described_class::Create
+        :team_short   | described_class::TeamShort
+        :trial_short  | described_class::TrialShort
+        :admin_verify | described_class::AdminVerify
         :verify       | described_class::Verify
         :trial        | described_class::Trial
         :team         | described_class::Team
+        :experience   | described_class::Experience
+        :invite_team  | described_class::InviteTeam
       end
 
       with_them do

spec/mailers/emails/in_product_marketing_spec.rb

@@ -63,6 +63,7 @@ RSpec.describe Emails::InProductMarketing do
       :team_short   | 0
       :trial_short  | 0
       :admin_verify | 0
+      :invite_team  | 0
     end
 
     with_them do
@@ -92,6 +93,12 @@ RSpec.describe Emails::InProductMarketing do
             is_expected.not_to have_body_text(message.invite_text)
             is_expected.not_to have_body_text(CGI.unescapeHTML(message.invite_link))
           end
+
+          if track == :invite_team
+            is_expected.not_to have_body_text(/This is email \d of \d/)
+          else
+            is_expected.to have_body_text(message.progress)
+          end
         end
       end
     end