[WIP] Mutant integration

Gemfile

@@ -10,6 +10,8 @@ group :development do
     gem 'guard'
     gem 'guard-bundler'
     gem 'guard-rspec'
+    gem 'mutant',       '~> 0.5.10'
+    gem 'mutant-rspec', '~> 0.5.10'
   end
   gem 'pry'
 end

Rakefile

@@ -13,3 +13,23 @@ rescue LoadError
 end
 
 task :default => [:spec, :rubocop]
+
+task :mutant => :spec do
+  require 'mutant'
+
+  ignores = [
+    # Mutation with infinite runtime
+    'Naught::NullClassBuilder::Commands::Pebble#call'
+  ]
+
+  arguments = []
+  arguments << '--include' << 'lib'
+  arguments << '--require' << 'naught'
+  arguments << '--use'     << 'rspec'
+  arguments << '--score'   << '87.02'
+  arguments << 'Naught*'
+  ignores.each do |ignore|
+    arguments << '--ignore-subject' << ignore
+  end
+  fail unless Mutant::CLI.run(arguments)
+end

spec/spec_helper.rb

@@ -1,13 +1,37 @@
 GEM_ROOT = File.expand_path('../../', __FILE__)
 $LOAD_PATH.unshift File.join(GEM_ROOT, 'lib')
 
-if ENV['TRAVIS']
-  require 'coveralls'
-  Coveralls.wear!
-else
-  require 'simplecov'
-  SimpleCov.start
-end
+# if ENV['TRAVIS']
+#   require 'coveralls'
+#   Coveralls.wear!
+# else
+# # TODO: Renable in a guard that prevents the hooks to interfere with mutant killforks.
+# # require 'simplecov'
+# SimpleCov.start
+# end
 
 require 'naught'
 Dir[File.join(GEM_ROOT, 'spec', 'support', '**/*.rb')].each { |f| require f }
+
+require 'mutant'
+require 'mutant-rspec'
+
+# Monkeypatch to mutant all specs per mutation.
+#
+# TODO: Push this down to a configuration option.
+#
+module Mutant
+  module Rspec
+    class Killer
+      # Return all example groups
+      #
+      # @return [Enumerable<RSpec::Example>]
+      #
+      # @api private
+      #
+      def example_groups
+        strategy.example_groups
+      end
+    end # Rspec
+  end # Killer
+end # Mutant