Add Mutant::Runner::Subject

The idea is to break up the big fat and ugly Runner class into dedicated
pices with a single reponsibility.

lib/mutant.rb

@@ -107,6 +107,8 @@ require 'mutant/strategy/rspec/dm2'
 require 'mutant/strategy/rspec/dm2/lookup'
 require 'mutant/strategy/rspec/dm2/lookup/method'
 require 'mutant/runner'
+require 'mutant/runner/subject'
+require 'mutant/runner/mutation'
 require 'mutant/cli'
 require 'mutant/cli/classifier'
 require 'mutant/cli/classifier/namespace'

lib/mutant/runner.rb

@@ -1,22 +1,7 @@
 module Mutant
   # Runner that allows to mutate an entire project
   class Runner
-    include Adamantium::Flat, Equalizer.new(:config)
-    extend MethodObject
-
-    # Test for succcess
-    #
-    # @return [true]
-    #   when there are subjects and no failures
-    #
-    # @return [false]
-    #   otherwise
-    #
-    # @api private
-    #
-    def success?
-      reporter.success?
-    end
+    include Adamantium::Flat, AbstractType
 
     # Return config
     #
@@ -26,8 +11,6 @@ module Mutant
     #
     attr_reader :config
 
-  private
-
     # Initialize object
     #
     # @param [Config] config
@@ -41,106 +24,15 @@ module Mutant
       run
     end
 
-    # Return strategy
-    #
-    # @return [Strategy]
-    #
-    # @api private
-    #
-    def strategy
-      config.strategy
-    end
+  private
 
-    # Return reporter
-    #
-    # @return [Reporter]
-    #
-    # @api private
-    #
-    def reporter
-      config.reporter
-    end
-
-    # Run mutation killers on subjects
+    # Perform operation
     #
     # @return [undefined]
     #
     # @api private
     #
-    def run
-      reporter.start(config)
-      util = strategy
-      util.setup
-      config.matcher.each do |subject|
-        reporter.subject(subject)
-        run_subject(subject)
-      end
-      util.teardown
-      reporter.stop
-    end
+    abstract_method :run
 
-    # Run mutation killers on subject
-    #
-    # @param [Subject] subject
-    #
-    # @return [undefined]
-    #
-    # @api private
-    #
-    def run_subject(subject)
-      return unless test_noop(subject)
-      subject.each do |mutation|
-        next unless config.filter.match?(mutation)
-        reporter.mutation(mutation)
-        kill(mutation)
-      end
-    end
-
-    # Test noop mutation
-    #
-    # @return [true]
-    #   if noop mutation is alive
-    #
-    # @return [false]
-    #   otherwise
-    #
-    # @api private
-    #
-    def test_noop(subject)
-      noop = subject.noop
-      unless kill(noop)
-        reporter.noop(noop)
-        return false
-      end
-      true
-    end
-
-    # Run killer on mutation
-    #
-    # @param [Mutation] mutation
-    #
-    # @return [true]
-    #   if killer was successful
-    #
-    # @return [false]
-    #   otherwise
-    #
-    # @api private
-    #
-    def kill(mutation)
-      killer = killer(mutation)
-      reporter.report_killer(killer)
-      killer.success?
-    end
-
-    # Return killer for mutation
-    #
-    # @return [Killer]
-    #
-    # @api private
-    #
-    def killer(mutation)
-      strategy.kill(mutation)
-    end
   end
 end

lib/mutant/runner/subject.rb

@@ -0,0 +1,41 @@
+module Mutant
+  class Runner
+    # Subject specific runner
+    class Subject < self
+
+      # Return mutation runners
+      #
+      # @return [Enumerable<Runner::Mutation>]
+      #
+      # @api private
+      #
+      attr_reader :mutations
+
+      # Initialize object
+      #
+      # @param [Configuration] config
+      # @param [Subject] subject
+      #
+      # @return [undefined]
+      #
+      # @api private
+      #
+      def initialize(config, subject)
+        @subject = subject
+        super(config)
+      end
+
+    private
+
+      # Perform operation
+      #
+      # @return [undefined]
+      #
+      # @api private
+      #
+      def run
+      end
+
+    end
+  end
+end

spec/unit/mutant/runner/subject/class_methods/new_spec.rb

@@ -0,0 +1,27 @@
+require 'spec_helper'
+
+describe Mutant::Runner::Subject do
+  let(:object) { described_class }
+
+  let(:config)           { mock('Config')  }
+  let(:mutation)         { mock('Mutation') }
+  let(:mutation_subject) { [mutation] }
+
+  class DummyRunner
+    include Equalizer.new(:config, :mutation)
+
+    attr_reader :mutation
+
+    def initialize(config, mutation)
+      @config, @mutation = config, mutation
+    end
+  end
+
+  before do
+    stub_const('Mutant::Runner::Mutation', DummyRunner)
+  end
+
+  subject { object.new(config, mutation_subject) }
+
+  its(:mutations) { eql([DummyRunner.new(config, mutation)]) }
+end