Improve groups list specs

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

app/views/dashboard/groups/_groups.html.haml

 .js-groups-list-holder
   %ul.content-list
     - @group_members.each do |group_member|
-      - group = group_member.group
-      = render 'shared/groups/group', group: group, group_member: group_member
+      = render 'shared/groups/group', group: group_member.group, group_member: group_member
   = paginate @group_members, theme: 'gitlab'

spec/features/dashboard/groups_list_spec.rb

 require 'spec_helper'
-RSpec.describe 'Dashboard Groups page', js: true, feature: true do
+describe 'Dashboard Groups page', js: true, feature: true do
   include WaitForAjax
   let!(:user) { create :user }
@@ -40,8 +40,8 @@ RSpec.describe 'Dashboard Groups page', js: true, feature: true do
     wait_for_ajax
     expect(page).to have_content(group.full_name)
-    expect(page).to have_content(public_group.full_name)
-    expect(page).not_to have_content(private_group.full_name)
+    expect(page).to have_content(nested_group.full_name)
+    expect(page).not_to have_content(another_group.full_name)
     expect(page.all('.js-groups-list-holder .content-list li').length).to eq 2
   end
 end

spec/features/explore/groups_list_spec.rb

 require 'spec_helper'
-RSpec.describe 'Explore Groups page', js: true, feature: true do
+describe 'Explore Groups page', js: true, feature: true do
   include WaitForAjax
   let!(:user) { create :user }