Combined Registration validations and defaults

Because the combined_registration experiment doesn't have a field for
namespace path, it's hard to validate before the user submits using FE
validation. So here I'm suggesting a path name in case the user does
something wild like uses only an emoji for the group name.

part of:
https://gitlab.com/gitlab-org/gitlab/-/issues/285563

ee/app/controllers/registrations/groups_projects_controller.rb

@@ -22,7 +22,7 @@ module Registrations
       @group = if group_id = params[:group][:id]
                  Group.find_by_id(group_id)
                else
-                 Groups::CreateService.new(current_user, group_params).execute
+                 Groups::CreateService.new(current_user, modified_group_params).execute
                end
 
       if @group.persisted?
@@ -59,7 +59,7 @@ module Registrations
     end
 
     def import
-      @group = Groups::CreateService.new(current_user, group_params).execute
+      @group = Groups::CreateService.new(current_user, modified_group_params).execute
       if @group.persisted?
         combined_registration_experiment.track(:create_group, namespace: @group)
         experiment(:jobs_to_be_done, user: current_user).track(:create_group, namespace: @group)
@@ -81,5 +81,15 @@ module Registrations
     def project_params
       params.require(:project).permit(project_params_attributes).merge(namespace_id: @group.id)
     end
+
+    def modified_group_params
+      group_name = params.dig(:group, :name)
+
+      if group_name.present? && params.dig(:group, :path).blank?
+        group_params.compact_blank.with_defaults(path: Namespace.clean_path(group_name))
+      else
+        group_params
+      end
+    end
   end
 end

ee/app/views/registrations/welcome/_setup_for_company.html.haml

@@ -8,8 +8,8 @@
       = f.label :setup_for_company, setup_for_company_label_text, class: 'label-bold'
       .gl-display-flex.gl-flex-direction-column.gl-lg-flex-direction-row
         .gl-flex-grow-1
-          = f.radio_button :setup_for_company, true, class: 'js-setup-for-company'
+          = f.radio_button :setup_for_company, true, class: 'js-setup-for-company', required: true
           = f.label :setup_for_company, _('My company or team'), class: 'normal', value: 'true'
         .gl-flex-grow-1
-          = f.radio_button :setup_for_company, false, class: 'js-setup-for-me'
+          = f.radio_button :setup_for_company, false, class: 'js-setup-for-me', required: true
           = f.label :setup_for_company, _('Just me'), class: 'normal', value: 'false'

ee/spec/controllers/registrations/groups_projects_controller_spec.rb

@@ -94,6 +94,14 @@ RSpec.describe Registrations::GroupsProjectsController, :experiment do
         end
       end
 
+      context 'when there is no suggested path based from the name' do
+        let(:group_params) { { name: '⛄⛄⛄', path: '' } }
+
+        it 'creates a group' do
+          expect { subject }.to change { Group.count }.by(1)
+        end
+      end
+
       context 'when the group cannot be created' do
         let(:group_params) { { name: '', path: '' } }
 
@@ -252,6 +260,15 @@ RSpec.describe Registrations::GroupsProjectsController, :experiment do
         it { is_expected.to render_template(:new) }
       end
 
+      context 'when there is no suggested path based from the group name' do
+        let(:group_params) { { name: '⛄⛄⛄', path: '' } }
+
+        it 'creates a group, and redirects' do
+          expect { subject }.to change { Group.count }.by(1)
+          expect(subject).to have_gitlab_http_status(:redirect)
+        end
+      end
+
       context 'when group can be created' do
         it 'creates a group' do
           expect { subject }.to change { Group.count }.by(1)