Fix Admin Links to new Group does not respect Default Visibility

Settings

This is done by passing a visibility_level option to the group edit _form.
The visibility_level is set to @group.visibility_level in edit ation and
to default_group_visibility in the new action.

app/views/admin/groups/_form.html.haml

@@ -7,7 +7,7 @@
     .col-sm-10
       = render 'shared/choose_group_avatar_button', f: f
 
-  = render 'shared/visibility_level', f: f, visibility_level: @group.visibility_level, can_change_visibility_level: can_change_group_visibility_level?(@group), form_model: @group
+  = render 'shared/visibility_level', f: f, visibility_level: visibility_level, can_change_visibility_level: can_change_group_visibility_level?(@group), form_model: @group
 
   .form-group
     .col-sm-offset-2.col-sm-10

app/views/admin/groups/edit.html.haml

 - page_title "Edit", @group.name, "Groups"
 %h3.page-title Edit group: #{@group.name}
 %hr
-= render 'form'
+= render 'form', visibility_level: @group.visibility_level

app/views/admin/groups/new.html.haml

 - page_title "New Group"
 %h3.page-title New group
 %hr
-= render 'form'
+= render 'form', visibility_level: default_group_visibility

changelogs/unreleased/19981-admin-links-new-group-default-visibility.yml

+---
+title: Make New Group form respect default visibility application setting
+merge_request: 7454
+author: Jacopo Beschi @jacopo-beschi

spec/features/admin/admin_groups_spec.rb

+require 'spec_helper'
+
+feature 'Admin Groups', feature: true do
+  let(:internal) { Gitlab::VisibilityLevel::INTERNAL }
+
+  before do
+    login_as(:admin)
+
+    stub_application_setting(default_group_visibility: internal)
+  end
+
+  describe 'create a group' do
+    scenario 'shows the visibility level radio populated with the default value' do
+      visit new_admin_group_path
+
+      expect_selected_visibility(internal)
+    end
+  end
+
+  describe 'group edit' do
+    scenario 'shows the visibility level radio populated with the group visibility_level value' do
+      group = create(:group, :private)
+
+      visit edit_admin_group_path(group)
+
+      expect_selected_visibility(group.visibility_level)
+    end
+  end
+
+  def expect_selected_visibility(level)
+    selector = "#group_visibility_level_#{level}[checked=checked]"
+
+    expect(page).to have_selector(selector, count: 1)
+  end
+end