Uses the frozen_string_literal magic comment (will be the default in Ruby 3)

spec/app/controllers/aliases_spec.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 describe WPScan::Controller::Aliases do
   subject(:controller) { described_class.new }
   let(:target_url)     { 'http://ex.lo/' }

spec/app/controllers/core_spec.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 describe WPScan::Controller::Core do
   subject(:core)       { described_class.new }
   let(:target_url)     { 'http://ex.lo/' }

spec/app/controllers/custom_directories_spec.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 describe WPScan::Controller::CustomDirectories do
   subject(:controller) { described_class.new }
   let(:target_url)     { 'http://ex.lo/' }

spec/app/controllers/enumeration_spec.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 describe WPScan::Controller::Enumeration do
   subject(:controller) { described_class.new }
   let(:target_url)     { 'http://wp.lab/' }

spec/app/controllers/password_attack_spec.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 describe WPScan::Controller::PasswordAttack do
   subject(:controller) { described_class.new }
   let(:target_url)     { 'http://ex.lo/' }

spec/app/controllers/wp_version_spec.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 def it_calls_the_formatter_with_the_correct_parameter(version)
   it 'calls the formatter with the correct parameter' do
     expect(controller.formatter).to receive(:output)