Use Gitlab::FeatureCategories in specs

This is our single source of truth for feature categories, so we can use
it instead of loading the YAML file each time.

ee/spec/lib/ee/gitlab/etag_caching/router/restful_spec.rb

@@ -21,7 +21,7 @@ RSpec.describe Gitlab::EtagCaching::Router::Restful do
   end
 
   it 'has a valid feature category for every route', :aggregate_failures do
-    feature_categories = YAML.load_file(Rails.root.join('config', 'feature_categories.yml')).to_set
+    feature_categories = Gitlab::FeatureCategories.default.categories
 
     described_class.ee_routes.each do |route|
       expect(feature_categories).to include(route.feature_category), "#{route.name} has a category of #{route.feature_category}, which is not valid"

spec/controllers/every_controller_spec.rb

@@ -4,7 +4,7 @@ require 'spec_helper'
 RSpec.describe "Every controller" do
   context "feature categories" do
     let_it_be(:feature_categories) do
-      YAML.load_file(Rails.root.join('config', 'feature_categories.yml')).map(&:to_sym).to_set
+      Gitlab::FeatureCategories.default.categories.map(&:to_sym).to_set
     end
 
     let_it_be(:controller_actions) do

spec/lib/api/every_api_endpoint_spec.rb

@@ -5,7 +5,7 @@ require 'spec_helper'
 RSpec.describe 'Every API endpoint' do
   context 'feature categories' do
     let_it_be(:feature_categories) do
-      YAML.load_file(Rails.root.join('config', 'feature_categories.yml')).map(&:to_sym).to_set
+      Gitlab::FeatureCategories.default.categories.map(&:to_sym).to_set
     end
 
     let_it_be(:api_endpoints) do

spec/lib/gitlab/etag_caching/router/graphql_spec.rb

@@ -11,7 +11,7 @@ RSpec.describe Gitlab::EtagCaching::Router::Graphql do
   end
 
   it 'has a valid feature category for every route', :aggregate_failures do
-    feature_categories = YAML.load_file(Rails.root.join('config', 'feature_categories.yml')).to_set
+    feature_categories = Gitlab::FeatureCategories.default.categories
 
     described_class::ROUTES.each do |route|
       expect(feature_categories).to include(route.feature_category), "#{route.name} has a category of #{route.feature_category}, which is not valid"

spec/lib/gitlab/etag_caching/router/restful_spec.rb

@@ -107,7 +107,7 @@ RSpec.describe Gitlab::EtagCaching::Router::Restful do
   end
 
   it 'has a valid feature category for every route', :aggregate_failures do
-    feature_categories = YAML.load_file(Rails.root.join('config', 'feature_categories.yml')).to_set
+    feature_categories = Gitlab::FeatureCategories.default.categories
 
     described_class::ROUTES.each do |route|
       expect(feature_categories).to include(route.feature_category), "#{route.name} has a category of #{route.feature_category}, which is not valid"

spec/lib/gitlab/metrics/requests_rack_middleware_spec.rb

@@ -349,7 +349,7 @@ RSpec.describe Gitlab::Metrics::RequestsRackMiddleware, :aggregate_failures do
 
       it 'has every label in config/feature_categories.yml' do
         defaults = [::Gitlab::FeatureCategories::FEATURE_CATEGORY_DEFAULT, 'not_owned']
-        feature_categories = YAML.load_file(Rails.root.join('config', 'feature_categories.yml')).map(&:strip) + defaults
+        feature_categories = Gitlab::FeatureCategories.default.categories + defaults
 
         expect(described_class::FEATURE_CATEGORIES_TO_INITIALIZE).to all(be_in(feature_categories))
       end

spec/workers/every_sidekiq_worker_spec.rb

@@ -48,7 +48,7 @@ RSpec.describe 'Every Sidekiq worker' do
 
   describe "feature category declarations" do
     let(:feature_categories) do
-      YAML.load_file(Rails.root.join('config', 'feature_categories.yml')).map(&:to_sym).to_set
+      Gitlab::FeatureCategories.default.categories.map(&:to_sym).to_set
     end
 
     # All Sidekiq worker classes should declare a valid `feature_category`