Merge branch 'gy-add-demo-templates' into 'master'

Add Sample Data

See merge request gitlab-org/gitlab!41699

app/assets/javascripts/projects/default_sample_data_templates.js

+import { s__ } from '~/locale';
+
+export default {
+  basic: {
+    text: s__('ProjectTemplates|Basic'),
+    icon: '.template-option .icon-basic',
+  },
+  serenity_valley: {
+    text: s__('ProjectTemplates|Serenity Valley'),
+    icon: '.template-option .icon-serenity_valley',
+  },
+};

app/assets/javascripts/projects/project_new.js

 import $ from 'jquery';
 import DEFAULT_PROJECT_TEMPLATES from 'ee_else_ce/projects/default_project_templates';
+import DEFAULT_SAMPLE_DATA_TEMPLATES from '~/projects/default_sample_data_templates';
 import { addSelectOnFocusBehaviour } from '../lib/utils/common_utils';
 import {
   convertToTitleCase,
@@ -146,7 +147,8 @@ const bindEvents = () => {
     $selectedIcon.empty();
     const value = $(this).val();
 
-    const selectedTemplate = DEFAULT_PROJECT_TEMPLATES[value];
+    const selectedTemplate =
+      DEFAULT_PROJECT_TEMPLATES[value] || DEFAULT_SAMPLE_DATA_TEMPLATES[value];
     $selectedTemplateText.text(selectedTemplate.text);
     $(selectedTemplate.icon)
       .clone()

app/services/projects/create_from_template_service.rb

@@ -14,10 +14,16 @@ module Projects
     def execute
       return project unless validate_template!
 
-      file = built_in_template&.file
+      file = built_in_template&.file || sample_data_template&.file
 
       override_params = params.dup
-      params[:file] = file
+
+      if built_in_template
+        params[:file] = built_in_template.file
+      elsif sample_data_template
+        params[:file] = sample_data_template.file
+        params[:sample_data] = true
+      end
 
       GitlabProjectsImportService.new(current_user, params, override_params).execute
     ensure
@@ -27,7 +33,7 @@ module Projects
     private
 
     def validate_template!
-      return true if built_in_template
+      return true if built_in_template || sample_data_template
 
       project.errors.add(:template_name, _("'%{template_name}' is unknown or invalid" % { template_name: template_name }))
       false
@@ -39,6 +45,12 @@ module Projects
       end
     end
 
+    def sample_data_template
+      strong_memoize(:sample_data_template) do
+        Gitlab::SampleDataTemplate.find(template_name)
+      end
+    end
+
     def project
       @project ||= ::Project.new(namespace_id: params[:namespace_id])
     end

app/services/projects/gitlab_projects_import_service.rb

@@ -66,6 +66,7 @@ module Projects
       end
 
       if template_file
+        data[:sample_data] = params.delete(:sample_data) if params.key?(:sample_data)
         params[:import_type] = 'gitlab_project'
       end
 

app/views/projects/_project_templates.html.haml

 - f ||= local_assigns[:f]
 
-.project-templates-buttons.import-buttons.col-sm-12
-  = render 'projects/project_templates/built_in_templates'
+.project-templates-buttons.col-sm-12
+  %ul.nav-tabs.nav-links.nav.scrolling-tabs
+    %li.built-in-tab
+      %a.nav-link.active{ href: "#built-in", data: { toggle: 'tab'} }
+        = _('Built-in')
+        %span.badge.badge-pill= Gitlab::ProjectTemplate.all.count
+    %li.sample-data-templates-tab
+      %a.nav-link{ href: "#sample-data-templates", data: { toggle: 'tab'} }
+        = _('Sample Data')
+        %span.badge.badge-pill= Gitlab::SampleDataTemplate.all.count
+
+.tab-content
+  .project-templates-buttons.import-buttons.tab-pane.active#built-in
+    = render partial: 'projects/project_templates/template', collection: Gitlab::ProjectTemplate.all
+  .project-templates-buttons.import-buttons.tab-pane#sample-data-templates
+    = render partial: 'projects/project_templates/template', collection: Gitlab::SampleDataTemplate.all
 
 .project-fields-form
   = render 'projects/project_templates/project_fields_form'

app/views/projects/project_templates/_built_in_templates.html.haml

-- Gitlab::ProjectTemplate.all.each do |template|
-  .template-option.d-flex.align-items-center{ data: { qa_selector: 'template_option_row' } }
-    .logo.gl-mr-3.px-1
-      = image_tag template.logo, size: 32, class: "btn-template-icon icon-#{template.name}"
-    .description
-      %strong
-        = template.title
-      %br
-      .text-muted
-        = template.description
-    .controls.d-flex.align-items-center
-      %a.btn.btn-default.gl-mr-3{ href: template.preview, rel: 'noopener noreferrer', target: '_blank', data: { track_label: "template_preview", track_property: template.name, track_event: "click_button", track_value: "" } }
-        = _("Preview")
-      %label.btn.btn-success.template-button.choose-template.gl-mb-0{ for: template.name }
-        %input{ type: "radio", autocomplete: "off", name: "project[template_name]", id: template.name, value: template.name, data: { track_label: "template_use", track_property: template.name, track_event: "click_button", track_value: "" } }
-        %span{ data: { qa_selector: 'use_template_button' } }
-          = _("Use template")

app/views/projects/project_templates/_template.html.haml

+.template-option.d-flex.align-items-center{ data: { qa_selector: 'template_option_row' } }
+  .logo.gl-mr-3.px-1
+    = image_tag template.logo, size: 32, class: "btn-template-icon icon-#{template.name}"
+  .description
+    %strong
+      = template.title
+    %br
+    .text-muted
+      = template.description
+  .controls.d-flex.align-items-center
+    %a.btn.gl-button.btn-default.gl-mr-3{ href: template.preview, rel: 'noopener noreferrer', target: '_blank', data: { track_label: "template_preview", track_property: template.name, track_event: "click_button", track_value: "" } }
+      = _("Preview")
+    %label.btn.gl-button.btn-success.template-button.choose-template.gl-mb-0{ for: template.name }
+      %input{ type: "radio", autocomplete: "off", name: "project[template_name]", id: template.name, value: template.name, data: { track_label: "template_use", track_property: template.name, track_event: "click_button", track_value: "" } }
+      %span{ data: { qa_selector: 'use_template_button' } }
+        = _("Use template")

changelogs/unreleased/gy-add-demo-templates.yml

+---
+title: Add Sample Data
+merge_request: 41699
+author:
+type: added

doc/gitlab-basics/create-project.md

@@ -58,7 +58,7 @@ To create a new blank project on the **New project** page:
 Project templates can pre-populate a new project with the necessary files to get you
 started quickly.
 
-There are two types of project templates:
+There are two main types of project templates:
 
 - [Built-in templates](#built-in-templates), sourced from the following groups:
   - [`project-templates`](https://gitlab.com/gitlab-org/project-templates)

ee/app/views/projects/_project_templates.html.haml

@@ -17,16 +17,22 @@
           = _('Group')
           %span.badge.badge-pill.qa-group-template-tab-badge
             = group_project_templates_count(group_id)
+      %li.sample-data-templates-tab
+        %a.nav-link{ href: "#sample-data-templates", data: { toggle: 'tab'} }
+          = _('Sample Data')
+          %span.badge.badge-pill= Gitlab::SampleDataTemplate.all.count
 
   .tab-content
     .project-templates-buttons.import-buttons.tab-pane.active#built-in
-      = render 'projects/project_templates/built_in_templates'
+      = render partial: 'projects/project_templates/template', collection: Gitlab::ProjectTemplate.all
     .project-templates-buttons.import-buttons.tab-pane.js-custom-instance-project-templates-tab-content#custom-instance-project-templates{ data: {initial_templates: user_available_project_templates_path(current_user)} }
       .text-center.m-4
         = icon("spin spinner 2x")
     .project-templates-buttons.import-buttons.tab-pane.js-custom-group-project-templates-tab-content#custom-group-project-templates{ data: {initial_templates: user_available_group_templates_path(current_user, group_id: group_id)} }
       .text-center.m-4
         = icon("spin spinner 2x")
+    .project-templates-buttons.import-buttons.tab-pane#sample-data-templates
+      = render partial: 'projects/project_templates/template', collection: Gitlab::SampleDataTemplate.all
 
   .project-fields-form
     = render 'projects/project_templates/project_fields_form'

ee/spec/services/projects/create_from_template_service_spec.rb

@@ -69,6 +69,7 @@ RSpec.describe Projects::CreateFromTemplateService do
 
         it 'creates an empty project' do
           expect(::Gitlab::ProjectTemplate).to receive(:find)
+          expect(::Gitlab::SampleDataTemplate).to receive(:find)
           expect(subject).not_to receive(:find_template_project)
         end
       end
@@ -78,6 +79,7 @@ RSpec.describe Projects::CreateFromTemplateService do
           stub_licensed_features(custom_project_templates: false)
 
           expect(::Gitlab::ProjectTemplate).to receive(:find)
+          expect(::Gitlab::SampleDataTemplate).to receive(:find)
           expect(subject).not_to receive(:find_template_project)
         end
       end

lib/gitlab/import_export/json/ndjson_reader.rb

@@ -35,6 +35,7 @@ module Gitlab
 
             # This reads from `tree/project/merge_requests.ndjson`
             path = file_path(importable_path, "#{key}.ndjson")
+
             next unless File.exist?(path)
 
             File.foreach(path, MAX_JSON_DOCUMENT_SIZE).with_index do |line, line_num|
@@ -43,6 +44,11 @@ module Gitlab
           end
         end
 
+        # TODO: Move clear logic into main comsume_relation method (see https://gitlab.com/gitlab-org/gitlab/-/merge_requests/41699#note_430465330)
+        def clear_consumed_relations
+          @consumed_relations.clear
+        end
+
         private
 
         def json_decode(string)

lib/gitlab/import_export/project/sample/date_calculator.rb

+# frozen_string_literal: true
+
+module Gitlab
+  module ImportExport
+    module Project
+      module Sample
+        class DateCalculator
+          include Gitlab::Utils::StrongMemoize
+
+          def initialize(dates)
+            @dates = dates.dup
+            @dates.flatten!
+            @dates.compact!
+            @dates.sort!
+            @dates.map! { |date| date.to_time.to_f }
+          end
+
+          def closest_date_to_average
+            strong_memoize(:closest_date_to_average) do
+              next if @dates.empty?
+
+              average_date = (@dates.first + @dates.last) / 2.0
+              closest_date = @dates.min_by { |date| (date - average_date).abs }
+              Time.zone.at(closest_date)
+            end
+          end
+
+          def calculate_by_closest_date_to_average(date)
+            return date unless closest_date_to_average && closest_date_to_average < Time.current
+
+            date + (Time.current - closest_date_to_average).seconds
+          end
+        end
+      end
+    end
+  end
+end

lib/gitlab/import_export/project/sample/sample_data_relation_tree_restorer.rb

+# frozen_string_literal: true
+
+module Gitlab
+  module ImportExport
+    module Project
+      module Sample
+        class SampleDataRelationTreeRestorer < RelationTreeRestorer
+          DATE_MODELS = %i[issues milestones].freeze
+
+          def initialize(*args)
+            super
+
+            date_calculator
+          end
+
+          private
+
+          def build_relation(relation_key, relation_definition, data_hash)
+            # Override due date attributes in data hash for Sample Data templates
+            # Dates are moved by taking the closest one to average and moving that (and rest around it) to the date of import
+            # TODO: To move this logic to RelationFactory (see: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/41699#note_430465333)
+            override_date_attributes!(relation_key, data_hash)
+            super
+          end
+
+          def override_date_attributes!(relation_key, data_hash)
+            return unless DATE_MODELS.include?(relation_key.to_sym)
+
+            data_hash['start_date'] = date_calculator.calculate_by_closest_date_to_average(data_hash['start_date'].to_time) unless data_hash['start_date'].nil?
+            data_hash['due_date'] = date_calculator.calculate_by_closest_date_to_average(data_hash['due_date'].to_time) unless data_hash['due_date'].nil?
+          end
+
+          # TODO: Move clear logic into main comsume_relation method (see https://gitlab.com/gitlab-org/gitlab/-/merge_requests/41699#note_430465330)
+          def dates
+            unless relation_reader.legacy?
+              DATE_MODELS.map do |tag|
+                relation_reader.consume_relation(@importable_path, tag).map { |model| model.first['due_date'] }.tap do
+                  relation_reader.clear_consumed_relations
+                end
+              end
+            end
+          end
+
+          def date_calculator
+            @date_calculator ||= Gitlab::ImportExport::Project::Sample::DateCalculator.new(dates)
+          end
+        end
+      end
+    end
+  end
+end

lib/gitlab/import_export/project/tree_restorer.rb

@@ -70,7 +70,7 @@ module Gitlab
         end
 
         def relation_tree_restorer
-          @relation_tree_restorer ||= RelationTreeRestorer.new(
+          @relation_tree_restorer ||= relation_tree_restorer_class.new(
             user: @user,
             shared: @shared,
             relation_reader: relation_reader,
@@ -84,6 +84,14 @@ module Gitlab
           )
         end
 
+        def relation_tree_restorer_class
+          sample_data_template? ? Sample::SampleDataRelationTreeRestorer : RelationTreeRestorer
+        end
+
+        def sample_data_template?
+          @project&.import_data&.data&.dig('sample_data')
+        end
+
         def members_mapper
           @members_mapper ||= Gitlab::ImportExport::MembersMapper.new(exported_members: @project_members,
                                                                       user: @user,

lib/gitlab/project_template.rb

@@ -36,36 +36,37 @@ module Gitlab
       name == other.name && title == other.title
     end
 
-    def self.localized_templates_table
-      [
-        ProjectTemplate.new('rails', 'Ruby on Rails', _('Includes an MVC structure, Gemfile, Rakefile, along with many others, to help you get started.'), 'https://gitlab.com/gitlab-org/project-templates/rails', 'illustrations/logos/rails.svg'),
-        ProjectTemplate.new('spring', 'Spring', _('Includes an MVC structure, mvnw and pom.xml to help you get started.'), 'https://gitlab.com/gitlab-org/project-templates/spring', 'illustrations/logos/spring.svg'),
-        ProjectTemplate.new('express', 'NodeJS Express', _('Includes an MVC structure to help you get started.'), 'https://gitlab.com/gitlab-org/project-templates/express', 'illustrations/logos/express.svg'),
-        ProjectTemplate.new('iosswift', 'iOS (Swift)', _('A ready-to-go template for use with iOS Swift apps.'), 'https://gitlab.com/gitlab-org/project-templates/iosswift', 'illustrations/logos/swift.svg'),
-        ProjectTemplate.new('dotnetcore', '.NET Core', _('A .NET Core console application template, customizable for any .NET Core project'), 'https://gitlab.com/gitlab-org/project-templates/dotnetcore', 'illustrations/logos/dotnet.svg'),
-        ProjectTemplate.new('android', 'Android', _('A ready-to-go template for use with Android apps.'), 'https://gitlab.com/gitlab-org/project-templates/android', 'illustrations/logos/android.svg'),
-        ProjectTemplate.new('gomicro', 'Go Micro', _('Go Micro is a framework for micro service development.'), 'https://gitlab.com/gitlab-org/project-templates/go-micro', 'illustrations/logos/gomicro.svg'),
-        ProjectTemplate.new('gatsby', 'Pages/Gatsby', _('Everything you need to create a GitLab Pages site using Gatsby.'), 'https://gitlab.com/pages/gatsby'),
-        ProjectTemplate.new('hugo', 'Pages/Hugo', _('Everything you need to create a GitLab Pages site using Hugo.'), 'https://gitlab.com/pages/hugo', 'illustrations/logos/hugo.svg'),
-        ProjectTemplate.new('jekyll', 'Pages/Jekyll', _('Everything you need to create a GitLab Pages site using Jekyll.'), 'https://gitlab.com/pages/jekyll', 'illustrations/logos/jekyll.svg'),
-        ProjectTemplate.new('plainhtml', 'Pages/Plain HTML', _('Everything you need to create a GitLab Pages site using plain HTML.'), 'https://gitlab.com/pages/plain-html'),
-        ProjectTemplate.new('gitbook', 'Pages/GitBook', _('Everything you need to create a GitLab Pages site using GitBook.'), 'https://gitlab.com/pages/gitbook', 'illustrations/logos/gitbook.svg'),
-        ProjectTemplate.new('hexo', 'Pages/Hexo', _('Everything you need to create a GitLab Pages site using Hexo.'), 'https://gitlab.com/pages/hexo', 'illustrations/logos/hexo.svg'),
-        ProjectTemplate.new('sse_middleman', 'Static Site Editor/Middleman', _('Middleman project with Static Site Editor support'), 'https://gitlab.com/gitlab-org/project-templates/static-site-editor-middleman'),
-        ProjectTemplate.new('gitpod_spring_petclinic', 'Gitpod/Spring Petclinic', _('A Gitpod configured Webapplication in Spring and Java'), 'https://gitlab.com/gitlab-org/project-templates/gitpod-spring-petclinic', 'illustrations/logos/gitpod.svg'),
-        ProjectTemplate.new('nfhugo', 'Netlify/Hugo', _('A Hugo site that uses Netlify for CI/CD instead of GitLab, but still with all the other great GitLab features.'), 'https://gitlab.com/pages/nfhugo', 'illustrations/logos/netlify.svg'),
-        ProjectTemplate.new('nfjekyll', 'Netlify/Jekyll', _('A Jekyll site that uses Netlify for CI/CD instead of GitLab, but still with all the other great GitLab features.'), 'https://gitlab.com/pages/nfjekyll', 'illustrations/logos/netlify.svg'),
-        ProjectTemplate.new('nfplainhtml', 'Netlify/Plain HTML', _('A plain HTML site that uses Netlify for CI/CD instead of GitLab, but still with all the other great GitLab features.'), 'https://gitlab.com/pages/nfplain-html', 'illustrations/logos/netlify.svg'),
-        ProjectTemplate.new('nfgitbook', 'Netlify/GitBook', _('A GitBook site that uses Netlify for CI/CD instead of GitLab, but still with all the other great GitLab features.'), 'https://gitlab.com/pages/nfgitbook', 'illustrations/logos/netlify.svg'),
-        ProjectTemplate.new('nfhexo', 'Netlify/Hexo', _('A Hexo site that uses Netlify for CI/CD instead of GitLab, but still with all the other great GitLab features.'), 'https://gitlab.com/pages/nfhexo', 'illustrations/logos/netlify.svg'),
-        ProjectTemplate.new('salesforcedx', 'SalesforceDX', _('A project boilerplate for Salesforce App development with Salesforce Developer tools.'), 'https://gitlab.com/gitlab-org/project-templates/salesforcedx'),
-        ProjectTemplate.new('serverless_framework', 'Serverless Framework/JS', _('A basic page and serverless function that uses AWS Lambda, AWS API Gateway, and GitLab Pages'), 'https://gitlab.com/gitlab-org/project-templates/serverless-framework', 'illustrations/logos/serverless_framework.svg'),
-        ProjectTemplate.new('jsonnet', 'Jsonnet for Dynamic Child Pipelines', _('An example showing how to use Jsonnet with GitLab dynamic child pipelines'), 'https://gitlab.com/gitlab-org/project-templates/jsonnet'),
-        ProjectTemplate.new('cluster_management', 'GitLab Cluster Management', _('An example project for managing Kubernetes clusters integrated with GitLab.'), 'https://gitlab.com/gitlab-org/project-templates/cluster-management')
-      ].freeze
-    end
-
     class << self
+      # TODO: Review child inheritance of this table (see: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/41699#note_430928221)
+      def localized_templates_table
+        [
+          ProjectTemplate.new('rails', 'Ruby on Rails', _('Includes an MVC structure, Gemfile, Rakefile, along with many others, to help you get started.'), 'https://gitlab.com/gitlab-org/project-templates/rails', 'illustrations/logos/rails.svg'),
+          ProjectTemplate.new('spring', 'Spring', _('Includes an MVC structure, mvnw and pom.xml to help you get started.'), 'https://gitlab.com/gitlab-org/project-templates/spring', 'illustrations/logos/spring.svg'),
+          ProjectTemplate.new('express', 'NodeJS Express', _('Includes an MVC structure to help you get started.'), 'https://gitlab.com/gitlab-org/project-templates/express', 'illustrations/logos/express.svg'),
+          ProjectTemplate.new('iosswift', 'iOS (Swift)', _('A ready-to-go template for use with iOS Swift apps.'), 'https://gitlab.com/gitlab-org/project-templates/iosswift', 'illustrations/logos/swift.svg'),
+          ProjectTemplate.new('dotnetcore', '.NET Core', _('A .NET Core console application template, customizable for any .NET Core project'), 'https://gitlab.com/gitlab-org/project-templates/dotnetcore', 'illustrations/logos/dotnet.svg'),
+          ProjectTemplate.new('android', 'Android', _('A ready-to-go template for use with Android apps.'), 'https://gitlab.com/gitlab-org/project-templates/android', 'illustrations/logos/android.svg'),
+          ProjectTemplate.new('gomicro', 'Go Micro', _('Go Micro is a framework for micro service development.'), 'https://gitlab.com/gitlab-org/project-templates/go-micro', 'illustrations/logos/gomicro.svg'),
+          ProjectTemplate.new('gatsby', 'Pages/Gatsby', _('Everything you need to create a GitLab Pages site using Gatsby.'), 'https://gitlab.com/pages/gatsby'),
+          ProjectTemplate.new('hugo', 'Pages/Hugo', _('Everything you need to create a GitLab Pages site using Hugo.'), 'https://gitlab.com/pages/hugo', 'illustrations/logos/hugo.svg'),
+          ProjectTemplate.new('jekyll', 'Pages/Jekyll', _('Everything you need to create a GitLab Pages site using Jekyll.'), 'https://gitlab.com/pages/jekyll', 'illustrations/logos/jekyll.svg'),
+          ProjectTemplate.new('plainhtml', 'Pages/Plain HTML', _('Everything you need to create a GitLab Pages site using plain HTML.'), 'https://gitlab.com/pages/plain-html'),
+          ProjectTemplate.new('gitbook', 'Pages/GitBook', _('Everything you need to create a GitLab Pages site using GitBook.'), 'https://gitlab.com/pages/gitbook', 'illustrations/logos/gitbook.svg'),
+          ProjectTemplate.new('hexo', 'Pages/Hexo', _('Everything you need to create a GitLab Pages site using Hexo.'), 'https://gitlab.com/pages/hexo', 'illustrations/logos/hexo.svg'),
+          ProjectTemplate.new('sse_middleman', 'Static Site Editor/Middleman', _('Middleman project with Static Site Editor support'), 'https://gitlab.com/gitlab-org/project-templates/static-site-editor-middleman'),
+          ProjectTemplate.new('gitpod_spring_petclinic', 'Gitpod/Spring Petclinic', _('A Gitpod configured Webapplication in Spring and Java'), 'https://gitlab.com/gitlab-org/project-templates/gitpod-spring-petclinic', 'illustrations/logos/gitpod.svg'),
+          ProjectTemplate.new('nfhugo', 'Netlify/Hugo', _('A Hugo site that uses Netlify for CI/CD instead of GitLab, but still with all the other great GitLab features.'), 'https://gitlab.com/pages/nfhugo', 'illustrations/logos/netlify.svg'),
+          ProjectTemplate.new('nfjekyll', 'Netlify/Jekyll', _('A Jekyll site that uses Netlify for CI/CD instead of GitLab, but still with all the other great GitLab features.'), 'https://gitlab.com/pages/nfjekyll', 'illustrations/logos/netlify.svg'),
+          ProjectTemplate.new('nfplainhtml', 'Netlify/Plain HTML', _('A plain HTML site that uses Netlify for CI/CD instead of GitLab, but still with all the other great GitLab features.'), 'https://gitlab.com/pages/nfplain-html', 'illustrations/logos/netlify.svg'),
+          ProjectTemplate.new('nfgitbook', 'Netlify/GitBook', _('A GitBook site that uses Netlify for CI/CD instead of GitLab, but still with all the other great GitLab features.'), 'https://gitlab.com/pages/nfgitbook', 'illustrations/logos/netlify.svg'),
+          ProjectTemplate.new('nfhexo', 'Netlify/Hexo', _('A Hexo site that uses Netlify for CI/CD instead of GitLab, but still with all the other great GitLab features.'), 'https://gitlab.com/pages/nfhexo', 'illustrations/logos/netlify.svg'),
+          ProjectTemplate.new('salesforcedx', 'SalesforceDX', _('A project boilerplate for Salesforce App development with Salesforce Developer tools.'), 'https://gitlab.com/gitlab-org/project-templates/salesforcedx'),
+          ProjectTemplate.new('serverless_framework', 'Serverless Framework/JS', _('A basic page and serverless function that uses AWS Lambda, AWS API Gateway, and GitLab Pages'), 'https://gitlab.com/gitlab-org/project-templates/serverless-framework', 'illustrations/logos/serverless_framework.svg'),
+          ProjectTemplate.new('jsonnet', 'Jsonnet for Dynamic Child Pipelines', _('An example showing how to use Jsonnet with GitLab dynamic child pipelines'), 'https://gitlab.com/gitlab-org/project-templates/jsonnet'),
+          ProjectTemplate.new('cluster_management', 'GitLab Cluster Management', _('An example project for managing Kubernetes clusters integrated with GitLab.'), 'https://gitlab.com/gitlab-org/project-templates/cluster-management')
+        ].freeze
+      end
+
       def all
         localized_templates_table
       end

lib/gitlab/sample_data_template.rb

+# frozen_string_literal: true
+
+module Gitlab
+  class SampleDataTemplate < ProjectTemplate
+    class << self
+      def localized_templates_table
+        [
+          SampleDataTemplate.new('basic', 'Basic', _('Basic Sample Data template with Issues, Merge Requests and Milestones.'), 'https://gitlab.com/gitlab-org/sample-data-templates/basic'),
+          SampleDataTemplate.new('serenity_valley', 'Serenity Valley', _('Serenity Valley Sample Data template.'), 'https://gitlab.com/gitlab-org/sample-data-templates/serenity-valley')
+        ].freeze
+      end
+
+      def all
+        localized_templates_table
+      end
+
+      def archive_directory
+        Rails.root.join("vendor/sample_data_templates")
+      end
+    end
+  end
+end

locale/gitlab.pot

@@ -4115,6 +4115,9 @@ msgstr ""
 msgid "Based on"
 msgstr ""
 
+msgid "Basic Sample Data template with Issues, Merge Requests and Milestones."
+msgstr ""
+
 msgid "Be careful. Changing the project's namespace can have unintended side effects."
 msgstr ""
 
@@ -20803,6 +20806,9 @@ msgstr ""
 msgid "ProjectTemplates|Android"
 msgstr ""
 
+msgid "ProjectTemplates|Basic"
+msgstr ""
+
 msgid "ProjectTemplates|GitLab Cluster Management"
 msgstr ""
 
@@ -20857,6 +20863,9 @@ msgstr ""
 msgid "ProjectTemplates|SalesforceDX"
 msgstr ""
 
+msgid "ProjectTemplates|Serenity Valley"
+msgstr ""
+
 msgid "ProjectTemplates|Serverless Framework/JS"
 msgstr ""
 
@@ -22836,6 +22845,9 @@ msgstr ""
 msgid "SSL Verification:"
 msgstr ""
 
+msgid "Sample Data"
+msgstr ""
+
 msgid "Satisfied"
 msgstr ""
 
@@ -23769,6 +23781,9 @@ msgstr ""
 msgid "September"
 msgstr ""
 
+msgid "Serenity Valley Sample Data template."
+msgstr ""
+
 msgid "SeriesFinalConjunction|and"
 msgstr ""
 

qa/qa/page/project/new.rb

@@ -27,7 +27,7 @@ module QA
           element :import_github, "icon('github', text: 'GitHub')" # rubocop:disable QA/ElementWithPattern
         end
 
-        view 'app/views/projects/project_templates/_built_in_templates.html.haml' do
+        view 'app/views/projects/project_templates/_template.html.haml' do
           element :use_template_button
           element :template_option_row
         end

spec/features/projects_spec.rb

@@ -6,25 +6,35 @@ RSpec.describe 'Project' do
   include ProjectForksHelper
   include MobileHelpers
 
-  describe 'creating from template' do
+  describe 'template' do
     let(:user) { create(:user) }
-    let(:template) { Gitlab::ProjectTemplate.find(:rails) }
 
     before do
       sign_in user
       visit new_project_path
     end
 
-    it "allows creation from templates", :js do
-      find('#create-from-template-tab').click
-      find("label[for=#{template.name}]").click
-      fill_in("project_name", with: template.name)
+    shared_examples 'creates from template' do |template, sub_template_tab = nil|
+      it "is created from template", :js do
+        find('#create-from-template-tab').click
+        find(".project-template #{sub_template_tab}").click if sub_template_tab
+        find("label[for=#{template.name}]").click
+        fill_in("project_name", with: template.name)
 
-      page.within '#content-body' do
-        click_button "Create project"
+        page.within '#content-body' do
+          click_button "Create project"
+        end
+
+        expect(page).to have_content template.name
       end
+    end
+
+    context 'create with project template' do
+      it_behaves_like 'creates from template', Gitlab::ProjectTemplate.find(:rails)
+    end
 
-      expect(page).to have_content template.name
+    context 'create with sample data template' do
+      it_behaves_like 'creates from template', Gitlab::SampleDataTemplate.find(:basic), '.sample-data-templates-tab'
     end
   end
 

spec/fixtures/lib/gitlab/import_export/sample_data/tree/project.json

+{"description":"Nisi et repellendus ut enim quo accusamus vel magnam.","import_type":"gitlab_project","creator_id":2147483547,"visibility_level":10,"archived":false,"hooks":[]}

spec/fixtures/lib/gitlab/import_export/sample_data/tree/project/issues.ndjson

+{"id":40,"title":"Voluptatem","author_id":22,"project_id":5,"created_at":"2016-06-14T15:02:08.340Z","updated_at":"2016-06-14T15:02:47.967Z","position":0,"branch_name":null,"description":"Aliquam enim illo et possimus.","state":"opened","iid":10,"updated_by_id":null,"confidential":false,"due_date":"2020-08-07","moved_to_id":null,"test_ee_field":"test","issue_assignees":[{"user_id":1,"issue_id":40},{"user_id":15,"issue_id":40},{"user_id":16,"issue_id":40},{"user_id":16,"issue_id":40},{"user_id":6,"issue_id":40}],"award_emoji":[{"id":1,"name":"musical_keyboard","user_id":1,"awardable_type":"Issue","awardable_id":40,"created_at":"2020-01-07T11:55:22.234Z","updated_at":"2020-01-07T11:55:22.234Z"}],"zoom_meetings":[{"id":1,"project_id":5,"issue_id":40,"url":"https://zoom.us/j/123456789","issue_status":1,"created_at":"2016-06-14T15:02:04.418Z","updated_at":"2016-06-14T15:02:04.418Z"}],"milestone":{"id":1,"title":"test milestone","project_id":8,"description":"test 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+{"id":39,"title":"Issue without assignees","author_id":22,"project_id":5,"created_at":"2016-06-14T15:02:08.233Z","updated_at":"2016-06-14T15:02:48.194Z","position":0,"branch_name":null,"description":"Voluptate vel reprehenderit facilis omnis voluptas magnam tenetur.","state":"opened","iid":9,"updated_by_id":null,"confidential":false,"due_date":"2020-08-14","moved_to_id":null,"issue_assignees":[],"milestone":{"id":1,"title":"test milestone","project_id":8,"description":"test milestone","due_date":null,"created_at":"2016-06-14T15:02:04.415Z","updated_at":"2016-06-14T15:02:04.415Z","state":"active","iid":1,"events":[{"id":487,"target_type":"Milestone","target_id":1,"project_id":46,"created_at":"2016-06-14T15:02:04.418Z","updated_at":"2016-06-14T15:02:04.418Z","action":1,"author_id":18}]},"notes":[{"id":359,"note":"Quo eius velit quia et id quam.","noteable_type":"Issue","author_id":26,"created_at":"2016-06-14T15:02:48.009Z","updated_at":"2016-06-14T15:02:48.009Z","project_id":5,"attachment":{"url":null},"line_code":null,"commit_id":null,"noteable_id":39,"system":false,"st_diff":null,"updated_by_id":null,"author":{"name":"User 4"},"events":[]},{"id":360,"note":"Nulla commodi ratione cumque id autem.","noteable_type":"Issue","author_id":25,"created_at":"2016-06-14T15:02:48.032Z","updated_at":"2016-06-14T15:02:48.032Z","project_id":5,"attachment":{"url":null},"line_code":null,"commit_id":null,"noteable_id":39,"system":false,"st_diff":null,"updated_by_id":null,"author":{"name":"User 3"},"events":[]},{"id":361,"note":"Illum non ea sed dolores corrupti.","noteable_type":"Issue","author_id":22,"created_at":"2016-06-14T15:02:48.056Z","updated_at":"2016-06-14T15:02:48.056Z","project_id":5,"attachment":{"url":null},"line_code":null,"commit_id":null,"noteable_id":39,"system":false,"st_diff":null,"updated_by_id":null,"author":{"name":"User 0"},"events":[]},{"id":362,"note":"Facere dolores ipsum dolorum maiores omnis occaecati ab.","noteable_type":"Issue","author_id":20,"created_at":"2016-06-14T15:02:48.082Z","updated_at":"2016-06-14T15:02:48.082Z","project_id":5,"attachment":{"url":null},"line_code":null,"commit_id":null,"noteable_id":39,"system":false,"st_diff":null,"updated_by_id":null,"author":{"name":"Ottis Schuster II"},"events":[]},{"id":363,"note":"Quod laudantium similique sint aut est ducimus.","noteable_type":"Issue","author_id":16,"created_at":"2016-06-14T15:02:48.113Z","updated_at":"2016-06-14T15:02:48.113Z","project_id":5,"attachment":{"url":null},"line_code":null,"commit_id":null,"noteable_id":39,"system":false,"st_diff":null,"updated_by_id":null,"author":{"name":"Rhett Emmerich IV"},"events":[]},{"id":364,"note":"Aut omnis eos esse incidunt vero reiciendis.","noteable_type":"Issue","author_id":15,"created_at":"2016-06-14T15:02:48.139Z","updated_at":"2016-06-14T15:02:48.139Z","project_id":5,"attachment":{"url":null},"line_code":null,"commit_id":null,"noteable_id":39,"system":false,"st_diff":null,"updated_by_id":null,"author":{"name":"Burdette Bernier"},"events":[]},{"id":365,"note":"Beatae dolore et doloremque asperiores sunt.","noteable_type":"Issue","author_id":6,"created_at":"2016-06-14T15:02:48.162Z","updated_at":"2016-06-14T15:02:48.162Z","project_id":5,"attachment":{"url":null},"line_code":null,"commit_id":null,"noteable_id":39,"system":false,"st_diff":null,"updated_by_id":null,"author":{"name":"Ari Wintheiser"},"events":[]},{"id":366,"note":"Doloribus ipsam ex delectus rerum libero recusandae modi repellendus.","noteable_type":"Issue","author_id":1,"created_at":"2016-06-14T15:02:48.192Z","updated_at":"2016-06-14T15:02:48.192Z","project_id":5,"attachment":{"url":null},"line_code":null,"commit_id":null,"noteable_id":39,"system":false,"st_diff":null,"updated_by_id":null,"author":{"name":"Administrator"},"events":[]}]}
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+{"id":32,"title":"Necessitatibus magnam qui at velit consequatur perspiciatis.","author_id":15,"project_id":5,"created_at":"2016-06-14T15:02:07.431Z","updated_at":"2016-06-14T15:02:49.884Z","position":0,"branch_name":null,"description":"Molestiae corporis magnam et fugit aliquid nulla quia.","state":"closed","iid":2,"updated_by_id":null,"confidential":false,"due_date":null,"moved_to_id":null,"notes":[{"id":415,"note":"Nemo consequatur sed blanditiis qui id iure dolores.","noteable_type":"Issue","author_id":26,"created_at":"2016-06-14T15:02:49.694Z","updated_at":"2016-06-14T15:02:49.694Z","project_id":5,"attachment":{"url":null},"line_code":null,"commit_id":null,"noteable_id":32,"system":false,"st_diff":null,"updated_by_id":null,"author":{"name":"User 4"},"events":[]},{"id":416,"note":"Voluptas ab accusantium dicta in.","noteable_type":"Issue","author_id":25,"created_at":"2016-06-14T15:02:49.718Z","updated_at":"2016-06-14T15:02:49.718Z","project_id":5,"attachment":{"url":null},"line_code":null,"commit_id":null,"noteable_id":32,"system":false,"st_diff":null,"updated_by_id":null,"author":{"name":"User 3"},"events":[]},{"id":417,"note":"Esse odit qui a et eum ducimus.","noteable_type":"Issue","author_id":22,"created_at":"2016-06-14T15:02:49.741Z","updated_at":"2016-06-14T15:02:49.741Z","project_id":5,"attachment":{"url":null},"line_code":null,"commit_id":null,"noteable_id":32,"system":false,"st_diff":null,"updated_by_id":null,"author":{"name":"User 0"},"events":[]},{"id":418,"note":"Sequi dolor doloribus ratione placeat repellendus.","noteable_type":"Issue","author_id":20,"created_at":"2016-06-14T15:02:49.767Z","updated_at":"2016-06-14T15:02:49.767Z","project_id":5,"attachment":{"url":null},"line_code":null,"commit_id":null,"noteable_id":32,"system":false,"st_diff":null,"updated_by_id":null,"author":{"name":"Ottis Schuster II"},"events":[]},{"id":419,"note":"Quae aspernatur rem est similique.","noteable_type":"Issue","author_id":16,"created_at":"2016-06-14T15:02:49.796Z","updated_at":"2016-06-14T15:02:49.796Z","project_id":5,"attachment":{"url":null},"line_code":null,"commit_id":null,"noteable_id":32,"system":false,"st_diff":null,"updated_by_id":null,"author":{"name":"Rhett Emmerich IV"},"events":[]},{"id":420,"note":"Voluptate omnis et id rerum non nesciunt laudantium assumenda.","noteable_type":"Issue","author_id":15,"created_at":"2016-06-14T15:02:49.825Z","updated_at":"2016-06-14T15:02:49.825Z","project_id":5,"attachment":{"url":null},"line_code":null,"commit_id":null,"noteable_id":32,"system":false,"st_diff":null,"updated_by_id":null,"author":{"name":"Burdette Bernier"},"events":[]},{"id":421,"note":"Quia enim ab et eligendi.","noteable_type":"Issue","author_id":6,"created_at":"2016-06-14T15:02:49.853Z","updated_at":"2016-06-14T15:02:49.853Z","project_id":5,"attachment":{"url":null},"line_code":null,"commit_id":null,"noteable_id":32,"system":false,"st_diff":null,"updated_by_id":null,"author":{"name":"Ari Wintheiser"},"events":[]},{"id":422,"note":"In fugiat rerum voluptas quas officia.","noteable_type":"Issue","author_id":1,"created_at":"2016-06-14T15:02:49.881Z","updated_at":"2016-06-14T15:02:49.881Z","project_id":5,"attachment":{"url":null},"line_code":null,"commit_id":null,"noteable_id":32,"system":false,"st_diff":null,"updated_by_id":null,"author":{"name":"Administrator"},"events":[]}]}
+{"id":31,"title":"issue_with_timelogs","author_id":16,"project_id":5,"created_at":"2016-06-14T15:02:07.280Z","updated_at":"2016-06-14T15:02:50.134Z","position":0,"branch_name":null,"description":"Quod ad architecto qui est sed quia.","state":"closed","iid":1,"updated_by_id":null,"confidential":false,"due_date":null,"moved_to_id":null,"timelogs":[{"id":1,"time_spent":72000,"user_id":1,"created_at":"2019-12-27T09:15:22.302Z","updated_at":"2019-12-27T09:15:22.302Z","spent_at":"2019-12-27T00:00:00.000Z"}],"notes":[{"id":423,"note":"A mollitia qui iste consequatur eaque iure omnis sunt.","noteable_type":"Issue","author_id":26,"created_at":"2016-06-14T15:02:49.933Z","updated_at":"2016-06-14T15:02:49.933Z","project_id":5,"attachment":{"url":null},"line_code":null,"commit_id":null,"noteable_id":31,"system":false,"st_diff":null,"updated_by_id":null,"author":{"name":"User 4"},"events":[]},{"id":424,"note":"Eveniet est et blanditiis sequi alias.","noteable_type":"Issue","author_id":25,"created_at":"2016-06-14T15:02:49.965Z","updated_at":"2016-06-14T15:02:49.965Z","project_id":5,"attachment":{"url":null},"line_code":null,"commit_id":null,"noteable_id":31,"system":false,"st_diff":null,"updated_by_id":null,"author":{"name":"User 3"},"events":[]},{"id":425,"note":"Commodi tempore voluptas doloremque est.","noteable_type":"Issue","author_id":22,"created_at":"2016-06-14T15:02:49.996Z","updated_at":"2016-06-14T15:02:49.996Z","project_id":5,"attachment":{"url":null},"line_code":null,"commit_id":null,"noteable_id":31,"system":false,"st_diff":null,"updated_by_id":null,"author":{"name":"User 0"},"events":[]},{"id":426,"note":"Quo libero impedit odio debitis rerum aspernatur.","noteable_type":"Issue","author_id":20,"created_at":"2016-06-14T15:02:50.024Z","updated_at":"2016-06-14T15:02:50.024Z","project_id":5,"attachment":{"url":null},"line_code":null,"commit_id":null,"noteable_id":31,"system":false,"st_diff":null,"updated_by_id":null,"author":{"name":"Ottis Schuster II"},"events":[]},{"id":427,"note":"Dolorem voluptatem qui labore deserunt.","noteable_type":"Issue","author_id":16,"created_at":"2016-06-14T15:02:50.049Z","updated_at":"2016-06-14T15:02:50.049Z","project_id":5,"attachment":{"url":null},"line_code":null,"commit_id":null,"noteable_id":31,"system":false,"st_diff":null,"updated_by_id":null,"author":{"name":"Rhett Emmerich IV"},"events":[]},{"id":428,"note":"Est blanditiis laboriosam enim ipsam.","noteable_type":"Issue","author_id":15,"created_at":"2016-06-14T15:02:50.077Z","updated_at":"2016-06-14T15:02:50.077Z","project_id":5,"attachment":{"url":null},"line_code":null,"commit_id":null,"noteable_id":31,"system":false,"st_diff":null,"updated_by_id":null,"author":{"name":"Burdette Bernier"},"events":[]},{"id":429,"note":"Et in voluptatem animi dolorem eos.","noteable_type":"Issue","author_id":6,"created_at":"2016-06-14T15:02:50.107Z","updated_at":"2016-06-14T15:02:50.107Z","project_id":5,"attachment":{"url":null},"line_code":null,"commit_id":null,"noteable_id":31,"system":false,"st_diff":null,"updated_by_id":null,"author":{"name":"Ari Wintheiser"},"events":[]},{"id":430,"note":"Unde culpa voluptate qui sint quos.","noteable_type":"Issue","author_id":1,"created_at":"2016-06-14T15:02:50.132Z","updated_at":"2016-06-14T15:02:50.132Z","project_id":5,"attachment":{"url":null},"line_code":null,"commit_id":null,"noteable_id":31,"system":false,"st_diff":null,"updated_by_id":null,"author":{"name":"Administrator"},"events":[]}]}

spec/fixtures/lib/gitlab/import_export/sample_data/tree/project/labels.ndjson

+{"id":2,"title":"test2","color":"#428bca","project_id":8,"created_at":"2016-07-22T08:55:44.161Z","updated_at":"2016-07-22T08:55:44.161Z","template":false,"description":"","type":"ProjectLabel","priorities":[]}
+{"id":3,"title":"test3","color":"#428bca","group_id":8,"created_at":"2016-07-22T08:55:44.161Z","updated_at":"2016-07-22T08:55:44.161Z","template":false,"description":"","project_id":null,"type":"GroupLabel","priorities":[{"id":1,"project_id":5,"label_id":1,"priority":1,"created_at":"2016-10-18T09:35:43.338Z","updated_at":"2016-10-18T09:35:43.338Z"}]}

spec/fixtures/lib/gitlab/import_export/sample_data/tree/project/milestones.ndjson

+{"id":1,"title":"test milestone","project_id":8,"description":"test milestone","due_date":"2020-08-07","created_at":"2016-06-14T15:02:04.415Z","updated_at":"2016-06-14T15:02:04.415Z","state":"active","iid":1,"events":[{"id":487,"target_type":"Milestone","target_id":1,"project_id":46,"created_at":"2016-06-14T15:02:04.418Z","updated_at":"2016-06-14T15:02:04.418Z","action":1,"author_id":18}]}
+{"id":20,"title":"v4.0","project_id":5,"description":"Totam quam laborum id magnam natus eaque aspernatur.","due_date":"2020-08-14","created_at":"2016-06-14T15:02:04.590Z","updated_at":"2016-06-14T15:02:04.590Z","state":"active","iid":5,"events":[{"id":240,"target_type":"Milestone","target_id":20,"project_id":36,"created_at":"2016-06-14T15:02:04.593Z","updated_at":"2016-06-14T15:02:04.593Z","action":1,"author_id":1},{"id":60,"target_type":"Milestone","target_id":20,"project_id":5,"created_at":"2016-06-14T15:02:04.593Z","updated_at":"2016-06-14T15:02:04.593Z","action":1,"author_id":20}]}
+{"id":19,"title":"v3.0","project_id":5,"description":"Rerum at autem exercitationem ea voluptates harum quam placeat.","due_date":"2020-08-21","created_at":"2016-06-14T15:02:04.583Z","updated_at":"2016-06-14T15:02:04.583Z","state":"active","iid":4,"events":[{"id":241,"target_type":"Milestone","target_id":19,"project_id":36,"created_at":"2016-06-14T15:02:04.585Z","updated_at":"2016-06-14T15:02:04.585Z","action":1,"author_id":1},{"id":59,"target_type":"Milestone","target_id":19,"project_id":5,"created_at":"2016-06-14T15:02:04.585Z","updated_at":"2016-06-14T15:02:04.585Z","action":1,"author_id":25}]}

spec/lib/gitlab/import_export/json/ndjson_reader_spec.rb

@@ -102,4 +102,14 @@ RSpec.describe Gitlab::ImportExport::JSON::NdjsonReader do
       end
     end
   end
+
+  describe '#clear_consumed_relations' do
+    let(:dir_path) { fixture }
+
+    subject { ndjson_reader.clear_consumed_relations }
+
+    it 'returns empty set' do
+      expect(subject).to be_empty
+    end
+  end
 end

spec/lib/gitlab/import_export/project/sample/date_calculator_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe Gitlab::ImportExport::Project::Sample::DateCalculator do
+  describe '#closest date to average' do
+    subject { described_class.new(dates).closest_date_to_average }
+
+    context 'when dates are empty' do
+      let(:dates) { [] }
+
+      it { is_expected.to be_nil }
+    end
+
+    context 'when dates are not empty' do
+      let(:dates) { [[nil, '2020-01-01 00:00:00 +0000'], [nil, '2021-01-01 00:00:00 +0000'], [nil, '2022-01-01 23:59:59 +0000']] }
+
+      it { is_expected.to eq(Time.zone.parse('2021-01-01 00:00:00 +0000')) }
+    end
+  end
+
+  describe '#calculate_by_closest_date_to_average' do
+    let(:calculator) { described_class.new([]) }
+    let(:date) { Time.current }
+
+    subject { calculator.calculate_by_closest_date_to_average(date) }
+
+    context 'when average date is nil' do
+      before do
+        allow(calculator).to receive(:closest_date_to_average).and_return(nil)
+      end
+
+      it { is_expected.to eq(date) }
+    end
+
+    context 'when average date is in the past' do
+      before do
+        allow(calculator).to receive(:closest_date_to_average).and_return(date - 365.days)
+        allow(Time).to receive(:current).and_return(date)
+      end
+
+      it { is_expected.to eq(date + 365.days) }
+    end
+
+    context 'when average date is in the future' do
+      before do
+        allow(calculator).to receive(:closest_date_to_average).and_return(date + 10.days)
+      end
+
+      it { is_expected.to eq(date) }
+    end
+  end
+end

spec/lib/gitlab/import_export/project/sample/sample_data_relation_tree_restorer_spec.rb

+# frozen_string_literal: true
+
+# This spec is a lightweight version of:
+#   * project/tree_restorer_spec.rb
+#
+# In depth testing is being done in the above specs.
+# This spec tests that restore of the sample project works
+# but does not have 100% relation coverage.
+
+require 'spec_helper'
+
+RSpec.describe Gitlab::ImportExport::Project::Sample::SampleDataRelationTreeRestorer do
+  include_context 'relation tree restorer shared context'
+
+  let(:sample_data_relation_tree_restorer) do
+    described_class.new(
+      user:                  user,
+      shared:                shared,
+      relation_reader:       relation_reader,
+      object_builder:        object_builder,
+      members_mapper:        members_mapper,
+      relation_factory:      relation_factory,
+      reader:                reader,
+      importable:            importable,
+      importable_path:       importable_path,
+      importable_attributes: attributes
+    )
+  end
+
+  subject { sample_data_relation_tree_restorer.restore }
+
+  shared_examples 'import project successfully' do
+    it 'restores project tree' do
+      expect(subject).to eq(true)
+    end
+
+    describe 'imported project' do
+      let(:project) { Project.find_by_path('project') }
+
+      before do
+        subject
+      end
+
+      it 'has the project attributes and relations', :aggregate_failures do
+        expect(project.description).to eq('Nisi et repellendus ut enim quo accusamus vel magnam.')
+        expect(project.issues.count).to eq(10)
+        expect(project.milestones.count).to eq(3)
+        expect(project.labels.count).to eq(2)
+        expect(project.project_feature).not_to be_nil
+      end
+
+      it 'has issues with correctly updated due dates' do
+        due_dates = due_dates(project.issues)
+
+        expect(due_dates).to match_array([Date.today - 7.days, Date.today, Date.today + 7.days])
+      end
+
+      it 'has milestones with correctly updated due dates' do
+        due_dates = due_dates(project.milestones)
+
+        expect(due_dates).to match_array([Date.today - 7.days, Date.today, Date.today + 7.days])
+      end
+
+      def due_dates(relations)
+        due_dates = relations.map { |relation| relation['due_date'] }
+        due_dates.compact!
+        due_dates.sort
+      end
+    end
+  end
+
+  context 'when restoring a project' do
+    let(:importable) { create(:project, :builds_enabled, :issues_disabled, name: 'project', path: 'project') }
+    let(:importable_name) { 'project' }
+    let(:importable_path) { 'project' }
+    let(:object_builder) { Gitlab::ImportExport::Project::ObjectBuilder }
+    let(:relation_factory) { Gitlab::ImportExport::Project::RelationFactory }
+    let(:reader) { Gitlab::ImportExport::Reader.new(shared: shared) }
+
+    context 'using ndjson reader' do
+      let(:path) { 'spec/fixtures/lib/gitlab/import_export/sample_data/tree' }
+      let(:relation_reader) { Gitlab::ImportExport::JSON::NdjsonReader.new(path) }
+
+      it_behaves_like 'import project successfully'
+    end
+  end
+end

spec/lib/gitlab/import_export/project/tree_restorer_spec.rb

@@ -1040,6 +1040,41 @@ RSpec.describe Gitlab::ImportExport::Project::TreeRestorer do
     it_behaves_like 'project tree restorer work properly', :legacy_reader, true
 
     it_behaves_like 'project tree restorer work properly', :ndjson_reader, true
+
+    context 'Sample Data JSON' do
+      let(:user) { create(:user) }
+      let!(:project) { create(:project, :builds_disabled, :issues_disabled, name: 'project', path: 'project') }
+      let(:project_tree_restorer) { described_class.new(user: user, shared: shared, project: project) }
+
+      before do
+        setup_import_export_config('sample_data')
+        setup_reader(:ndjson_reader)
+      end
+
+      context 'with sample_data_template' do
+        before do
+          allow(project).to receive_message_chain(:import_data, :data, :dig).with('sample_data') { true }
+        end
+
+        it 'initialize SampleDataRelationTreeRestorer' do
+          expect_next_instance_of(Gitlab::ImportExport::Project::Sample::SampleDataRelationTreeRestorer) do |restorer|
+            expect(restorer).to receive(:restore).and_return(true)
+          end
+
+          expect(project_tree_restorer.restore).to eq(true)
+        end
+      end
+
+      context 'without sample_data_template' do
+        it 'initialize RelationTreeRestorer' do
+          expect_next_instance_of(Gitlab::ImportExport::RelationTreeRestorer) do |restorer|
+            expect(restorer).to receive(:restore).and_return(true)
+          end
+
+          expect(project_tree_restorer.restore).to eq(true)
+        end
+      end
+    end
   end
 
   context 'disable ndjson import' do

spec/lib/gitlab/import_export/relation_tree_restorer_spec.rb

@@ -10,15 +10,7 @@
 require 'spec_helper'
 
 RSpec.describe Gitlab::ImportExport::RelationTreeRestorer do
-  include ImportExport::CommonUtil
-
-  let(:user) { create(:user) }
-  let(:shared) { Gitlab::ImportExport::Shared.new(importable) }
-  let(:attributes) { relation_reader.consume_attributes(importable_name) }
-
-  let(:members_mapper) do
-    Gitlab::ImportExport::MembersMapper.new(exported_members: {}, user: user, importable: importable)
-  end
+  include_context 'relation tree restorer shared context'
 
   let(:relation_tree_restorer) do
     described_class.new(

spec/lib/gitlab/sample_data_template_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe Gitlab::SampleDataTemplate do
+  describe '.all' do
+    it 'returns all templates' do
+      expected = %w[
+        basic
+        serenity_valley
+      ]
+
+      expect(described_class.all).to be_an(Array)
+      expect(described_class.all.map(&:name)).to match_array(expected)
+    end
+  end
+
+  describe '.find' do
+    subject { described_class.find(query) }
+
+    context 'when there is a match' do
+      let(:query) { :basic }
+
+      it { is_expected.to be_a(described_class) }
+    end
+
+    context 'when there is no match' do
+      let(:query) { 'no-match' }
+
+      it { is_expected.to be(nil) }
+    end
+  end
+
+  describe '.archive_directory' do
+    subject { described_class.archive_directory }
+
+    it { is_expected.to be_a Pathname }
+  end
+
+  describe 'validate all templates' do
+    let_it_be(:admin) { create(:admin) }
+
+    described_class.all.each do |template|
+      it "#{template.name} has a valid archive" do
+        archive = template.archive_path
+
+        expect(File.exist?(archive)).to be(true)
+      end
+
+      context 'with valid parameters' do
+        it 'can be imported' do
+          params = {
+            template_name: template.name,
+            namespace_id: admin.namespace.id,
+            path: template.name
+          }
+
+          project = Projects::CreateFromTemplateService.new(admin, params).execute
+
+          expect(project).to be_valid
+          expect(project).to be_persisted
+        end
+      end
+    end
+  end
+end

spec/support/shared_contexts/lib/gitlab/import_export/relation_tree_restorer_shared_context.rb

+# frozen_string_literal: true
+
+RSpec.shared_context 'relation tree restorer shared context' do
+  include ImportExport::CommonUtil
+
+  let(:user) { create(:user) }
+  let(:shared) { Gitlab::ImportExport::Shared.new(importable) }
+  let(:attributes) { relation_reader.consume_attributes(importable_name) }
+
+  let(:members_mapper) do
+    Gitlab::ImportExport::MembersMapper.new(exported_members: {}, user: user, importable: importable)
+  end
+end