Add default issue template e2e test

Adds an e2e test for default issue templates

ee/app/views/projects/settings/_default_issue_template.html.haml

 - if @project.feature_available?(:issuable_default_templates)
   - expanded = expanded_by_default?
-  %section.settings.issues-feature.no-animate#js-issue-settings{ class: [('expanded' if expanded), ('hidden' if @project.project_feature.send(:issues_access_level) == 0)] }
+  %section.settings.issues-feature.no-animate#js-issue-settings{ class: [('expanded' if expanded), ('hidden' if @project.project_feature.send(:issues_access_level) == 0)], data: { qa_selector: 'issue_template_settings_content' } }
     .settings-header
       %h4.settings-title.js-settings-toggle.js-settings-toggle-trigger-only= _('Default description template for issues')
       %button.gl-button.btn.btn-default.js-settings-toggle{ type: 'button' }= expanded ? _('Collapse') : _('Expand')
@@ -12,8 +12,8 @@
         %input{ type: 'hidden', name: 'update_section', value: 'js-issue-settings' }
         .row
           .form-group.col-md-9
-            = f.text_area :issues_template, class: "form-control", rows: 3, aria: { labelledby: 'issue-settings-default-template-label'}
+            = f.text_area :issues_template, class: "form-control", rows: 3, aria: { labelledby: 'issue-settings-default-template-label'}, data: { qa_selector: 'issue_template_field' }
             .text-secondary
               - link_start = '<a href="%{url}" target="_blank" rel="noopener noreferrer">'.html_safe % { url: help_page_path('user/markdown') }
               = _('Description parsed with %{link_start}GitLab Flavored Markdown%{link_end}.').html_safe % { link_start: link_start, link_end: '</a>'.html_safe }
-        = f.submit _('Save changes'), class: "gl-button btn btn-success"
+        = f.submit _('Save changes'), class: "gl-button btn btn-success", data: { qa_selector: 'save_issue_template_button' }

qa/qa/ee.rb

@@ -141,6 +141,7 @@ module QA
           autoload :Repository, 'qa/ee/page/project/settings/repository'
           autoload :PushRules, 'qa/ee/page/project/settings/push_rules'
           autoload :LicenseCompliance, 'qa/ee/page/project/settings/license_compliance'
+          autoload :IssueTemplateDefault, 'qa/ee/page/project/settings/issue_template_default.rb'
         end
 
         module Operations

qa/qa/ee/page/project/settings/issue_template_default.rb

+# frozen_string_literal: true
+
+module QA
+  module EE
+    module Page
+      module Project
+        module Settings
+          class IssueTemplateDefault < QA::Page::Base
+            view 'ee/app/views/projects/settings/_default_issue_template.html.haml' do
+              element :issue_template_field
+              element :save_issue_template_button
+            end
+
+            def set_default_issue_template(template)
+              fill_element(:issue_template_field, template)
+              click_element(:save_issue_template_button)
+
+              wait_for_requests
+            end
+          end
+        end
+      end
+    end
+  end
+end

qa/qa/ee/page/project/settings/main.rb

@@ -12,12 +12,22 @@ module QA
               super
 
               base.class_eval do
+                view 'ee/app/views/projects/settings/_default_issue_template.html.haml' do
+                  element :issue_template_settings_content
+                end
+
                 view 'ee/app/views/projects/_merge_request_approvals_settings.html.haml' do
                   element :merge_request_approvals_settings
                 end
               end
             end
 
+            def expand_default_description_template_for_issues(&block)
+              expand_content(:issue_template_settings_content) do
+                IssueTemplateDefault.perform(&block)
+              end
+            end
+
             def expand_merge_request_approvals_settings(&block)
               expand_content(:merge_request_approvals_settings) do
                 MergeRequestApprovals.perform(&block)

qa/qa/specs/features/ee/browser_ui/2_plan/issue/default_issue_template_spec.rb

+# frozen_string_literal: true
+
+module QA
+  RSpec.describe 'Plan' do
+    describe 'Default issue templates' do
+      let(:default_template_project) do
+        Resource::Project.fabricate_via_api! do |project|
+          project.name = "default-issue-template-project-#{SecureRandom.hex(8)}"
+        end
+      end
+
+      let(:template) { 'This is a default issue template' }
+
+      before do
+        Flow::Login.sign_in
+      end
+
+      it 'uses default template when creating an issue', testcase: 'https://gitlab.com/gitlab-org/quality/testcases/-/issues/1231' do
+        default_template_project.visit!
+
+        Page::Project::Menu.perform(&:go_to_general_settings)
+        Page::Project::Settings::Main.perform(&:expand_default_description_template_for_issues)
+        EE::Page::Project::Settings::IssueTemplateDefault.perform do |issue_settings|
+          issue_settings.set_default_issue_template(template)
+        end
+
+        Resource::Issue.fabricate_via_api! do |issue|
+          issue.project = default_template_project
+        end.visit!
+
+        expect(page).to have_content(template)
+      end
+    end
+  end
+end