fix specs

db/migrate/20170911134018_add_filter_to_ldap_group_links.rb

-# See http://doc.gitlab.com/ce/development/migration_style_guide.html
-# for more information on how to write migrations for GitLab.
-
 class AddFilterToLdapGroupLinks < ActiveRecord::Migration
+  DOWNTIME = false
+
   def change
     add_column(:ldap_group_links, :filter, :string)
   end

spec/ee/spec/lib/ee/gitlab/ldap/user_filter_spec.rb

@@ -14,6 +14,8 @@ describe EE::Gitlab::LDAP::UserFilter do
       base: 'dc=example,dc=com',
       active_directory: false
     )
+
+    allow(fake_proxy).to receive(:provider)
   end
 
   describe '#filter' do