Move feature flag test setup into config (#34124)

spec/lib/mastodon/feature_spec.rb

@@ -3,28 +3,23 @@
 require 'rails_helper'
 
 RSpec.describe Mastodon::Feature do
-  around do |example|
-    original_value = Rails.configuration.x.mastodon.experimental_features
-    Rails.configuration.x.mastodon.experimental_features = 'fasp,fetch_all_replies'
-    example.run
-    Rails.configuration.x.mastodon.experimental_features = original_value
-  end
-
-  describe '::fasp_enabled?' do
-    subject { described_class.fasp_enabled? }
-
-    it { is_expected.to be true }
-  end
-
-  describe '::fetch_all_replies_enabled?' do
-    subject { described_class.fetch_all_replies_enabled? }
+  describe '::testing_only_enabled?' do
+    subject { described_class.testing_only_enabled? }
 
     it { is_expected.to be true }
   end
 
   describe '::unspecified_feature_enabled?' do
-    subject { described_class.unspecified_feature_enabled? }
+    context 'when example is not tagged with a feature' do
+      subject { described_class.unspecified_feature_enabled? }
 
-    it { is_expected.to be false }
+      it { is_expected.to be false }
+    end
+
+    context 'when example is tagged with a feature', feature: 'unspecified_feature' do
+      subject { described_class.unspecified_feature_enabled? }
+
+      it { is_expected.to be true }
+    end
   end
 end

spec/support/feature_flags.rb

@@ -0,0 +1,8 @@
+# frozen_string_literal: true
+
+RSpec.configure do |config|
+  config.before(:example, :feature) do |example|
+    feature = example.metadata[:feature]
+    allow(Mastodon::Feature).to receive(:"#{feature}_enabled?").and_return(true)
+  end
+end