Fix flaky specs related to select2 helper

Ensures that select2 is loaded before opening, closing,
or selecting an option with our helper

ee/spec/features/groups/ldap_group_links_spec.rb

@@ -27,6 +27,8 @@ describe 'Edit group settings', :js do
 
       it 'adds new LDAP synchronization', :js do
         page.within('form#new_ldap_group_link') do
+          choose('sync_method_group')
+
           select2 'my-group-cn', from: '#ldap_group_link_cn'
           select 'Developer', from: 'ldap_group_link_group_access'
 
@@ -45,7 +47,6 @@ describe 'Edit group settings', :js do
       end
 
       it 'shows the LDAP group section' do
-        choose('sync_method_filter') # choose filter first, as group's the default
         choose('sync_method_group')
 
         expect(page).to have_content("Synchronize #{group.name}'s members with this LDAP group")

spec/features/projects/import_export/import_file_spec.rb

@@ -3,7 +3,6 @@
 require 'spec_helper'
 
 describe 'Import/Export - project import integration test', :js do
-  include Select2Helper
   include GitHelpers
 
   let(:user) { create(:user) }
@@ -31,7 +30,6 @@ describe 'Import/Export - project import integration test', :js do
       it 'user imports an exported project successfully' do
         visit new_project_path
 
-        select2(namespace.id, from: '#project_namespace_id')
         fill_in :project_name, with: project_name, visible: true
         click_import_project_tab
         click_link 'GitLab export'
@@ -78,7 +76,6 @@ describe 'Import/Export - project import integration test', :js do
 
     visit new_project_path
 
-    select2(user.namespace.id, from: '#project_namespace_id')
     fill_in :project_name, with: project.name, visible: true
     click_import_project_tab
     click_link 'GitLab export'

spec/support/helpers/select2_helper.rb

@@ -24,7 +24,7 @@ module Select2Helper
 
     selector = options.fetch(:from)
 
-    first(selector, visible: false)
+    ensure_select2_loaded(selector)
 
     if options[:multiple]
       execute_script("$('#{selector}').select2('val', ['#{value}']).trigger('change');")
@@ -34,14 +34,24 @@ module Select2Helper
   end
 
   def open_select2(selector)
+    ensure_select2_loaded(selector)
+
     execute_script("$('#{selector}').select2('open');")
   end
 
   def close_select2(selector)
+    ensure_select2_loaded(selector)
+
     execute_script("$('#{selector}').select2('close');")
   end
 
   def scroll_select2_to_bottom(selector)
     evaluate_script "$('#{selector}').scrollTop($('#{selector}')[0].scrollHeight); $('#{selector}');"
   end
+
+  private
+
+  def ensure_select2_loaded(selector)
+    first(selector, visible: :all).sibling('.select2-container')
+  end
 end