Clean up the BillingPlansHelper a bit

- Remove unused methods: current_plan?, plan_purchase_link,
  new_gitlab_com_trial_url
- Remove specs for unused methods: current_plan?
- Mark internally used methods as private
- Remove unused instance of RSpec::Parameterized::TableSyntax

ee/app/helpers/billing_plans_helper.rb

@@ -9,22 +9,6 @@ module BillingPlansHelper
     number_to_currency(value, unit: '$', strip_insignificant_zeros: true, format: "%u%n")
   end
 
-  def current_plan?(plan)
-    plan.purchase_link&.action == 'current_plan'
-  end
-
-  def plan_purchase_link(href, link_text)
-    if href
-      link_to link_text, href, class: 'btn btn-success'
-    else
-      button_tag link_text, class: 'btn disabled'
-    end
-  end
-
-  def new_gitlab_com_trial_url
-    "#{EE::SUBSCRIPTIONS_URL}/trials/new?gl_com=true"
-  end
-
   def subscription_plan_data_attributes(group, plan)
     return {} unless group
 
@@ -36,26 +20,12 @@ module BillingPlansHelper
     }
   end
 
-  def plan_upgrade_url(group, plan)
-    return unless group && plan&.id
-
-    "#{EE::SUBSCRIPTIONS_URL}/gitlab/namespaces/#{group.id}/upgrade/#{plan.id}"
-  end
-
   def use_new_purchase_flow?(namespace)
     namespace.group? &&
       namespace.actual_plan_name == Plan::FREE &&
       Feature.enabled?(:free_group_new_purchase_flow, current_user)
   end
 
-  def plan_purchase_url(group, plan)
-    if use_new_purchase_flow?(group)
-      new_subscriptions_path(plan_id: plan.id, namespace_id: group.id)
-    else
-      "#{plan.purchase_link.href}&gl_namespace_id=#{group.id}"
-    end
-  end
-
   def show_contact_sales_button?(purchase_link_action)
     experiment_enabled?(:contact_sales_btn_in_app) &&
       purchase_link_action == 'upgrade'
@@ -89,4 +59,20 @@ module BillingPlansHelper
   def namespace_for_user?(namespace)
     namespace == current_user.namespace
   end
+
+  private
+
+  def plan_purchase_url(group, plan)
+    if use_new_purchase_flow?(group)
+      new_subscriptions_path(plan_id: plan.id, namespace_id: group.id)
+    else
+      "#{plan.purchase_link.href}&gl_namespace_id=#{group.id}"
+    end
+  end
+
+  def plan_upgrade_url(group, plan)
+    return unless group && plan&.id
+
+    "#{EE::SUBSCRIPTIONS_URL}/gitlab/namespaces/#{group.id}/upgrade/#{plan.id}"
+  end
 end

ee/spec/helpers/billing_plans_helper_spec.rb

@@ -3,20 +3,6 @@
 require 'spec_helper'
 
 RSpec.describe BillingPlansHelper do
-  describe '#current_plan?' do
-    it 'returns true when current_plan' do
-      plan = Hashie::Mash.new(purchase_link: { action: 'current_plan' })
-
-      expect(helper.current_plan?(plan)).to be_truthy
-    end
-
-    it 'return false when not current_plan' do
-      plan = Hashie::Mash.new(purchase_link: { action: 'upgrade' })
-
-      expect(helper.current_plan?(plan)).to be_falsy
-    end
-  end
-
   describe '#subscription_plan_data_attributes' do
     let(:customer_portal_url) { "https://customers.gitlab.com/subscriptions" }
 
@@ -60,8 +46,6 @@ RSpec.describe BillingPlansHelper do
   end
 
   describe '#use_new_purchase_flow?' do
-    using RSpec::Parameterized::TableSyntax
-
     where free_group_new_purchase: [true, false],
           type: ['Group', nil],
           plan: Plan.all_plans