Use EE::SUBSCRIPTIONS_URL

ee/spec/features/billings/billing_plans_spec.rb

@@ -15,7 +15,7 @@ describe 'Billing plan pages', :feature do
   end
 
   before do
-    stub_full_request("https://customers.gitlab.com/gitlab_plans?plan=#{plan}")
+    stub_full_request("#{EE::SUBSCRIPTIONS_URL}/gitlab_plans?plan=#{plan}")
       .to_return(status: 200, body: plans_data.to_json)
     stub_application_setting(check_namespace_plan: true)
     allow(Gitlab).to receive(:com?) { true }

ee/spec/models/namespace_spec.rb

@@ -21,6 +21,7 @@ describe Namespace do
   it { is_expected.to delegate_method(:shared_runners_seconds_last_reset).to(:namespace_statistics) }
   it { is_expected.to delegate_method(:trial?).to(:gitlab_subscription) }
   it { is_expected.to delegate_method(:trial_ends_on).to(:gitlab_subscription) }
+  it { is_expected.to delegate_method(:upgradable?).to(:gitlab_subscription) }
 
   context 'scopes' do
     describe '.with_plan' do