diff --git a/lib/mutant.rb b/lib/mutant.rb
index 0412b198..38876986 100644
--- a/lib/mutant.rb
+++ b/lib/mutant.rb
@@ -35,8 +35,8 @@ module Mutant
 end
 
 require 'mutant/random'
-require 'mutant/runner'
-require 'mutant/runner/rspec'
+require 'mutant/killer'
+require 'mutant/killer/rspec'
 require 'mutant/mutator'
 require 'mutant/mutator/registry'
 require 'mutant/mutator/literal'
diff --git a/lib/mutant/runner.rb b/lib/mutant/killer.rb
similarity index 95%
rename from lib/mutant/runner.rb
rename to lib/mutant/killer.rb
index 45d33fa7..66bb34a9 100644
--- a/lib/mutant/runner.rb
+++ b/lib/mutant/killer.rb
@@ -1,6 +1,6 @@
 module Mutant
-  # Abstract runner for tests
-  class Runner
+  # Abstract runner for mutant killers
+  class Killer
     include Immutable, Abstract
 
     # Run runner
diff --git a/lib/mutant/killer/rspec.rb b/lib/mutant/killer/rspec.rb
new file mode 100644
index 00000000..6ea9d193
--- /dev/null
+++ b/lib/mutant/killer/rspec.rb
@@ -0,0 +1,96 @@
+module Mutant
+  class Killer
+    # Simple runner for rspec tests
+    class Rspec < self
+
+      # Return error stream
+      #
+      # @return [StringIO]
+      #
+      # @api private
+      #
+      attr_reader :error_stream
+
+      # Return output stream
+      #
+      # @return [StringIO]
+      #
+      # @api private
+      #
+      attr_reader :output_stream
+
+      # Run block in clean rspec environment
+      #
+      # @return [self]
+      #
+      # @api private
+      #
+      def self.nest
+        original_world, original_configuration = 
+          ::RSpec.instance_variable_get(:@world),
+          ::RSpec.instance_variable_get(:@configuration)
+
+        ::RSpec.instance_variable_set(:@world,nil)
+        ::RSpec.instance_variable_set(:@configuration,nil)
+
+        yield
+
+        self
+      ensure
+        ::RSpec.instance_variable_set(:@world,original_world)
+        ::RSpec.instance_variable_set(:@configuration,original_configuration)
+      end
+
+    private
+
+      # Initialize rspec runner
+      #
+      # @return [undefined]
+      #
+      # @api private
+      #
+      def initialize(*)
+        @error_stream, @output_stream = StringIO.new, StringIO.new
+        super
+      end
+
+      # Run rspec test
+      #
+      # @return [true]
+      #   returns true when test is NOT successful and the mutant was killed
+      #
+      # @return [false]
+      #   returns false otherwise
+      #
+      # @api private
+      #
+      def run
+        !RSpec::Core::Runner.run(command_line_arguments, error_stream, output_stream).zero?
+      end
+
+      # Return command line arguments
+      #
+      # @return [Array]
+      #
+      # @api private
+      #
+      def command_line_arguments
+        %W(
+          --fail-fast
+        ) + Dir[filename_pattern]
+      end
+
+      # Return rspec filename pattern
+      #
+      # @return [String]
+      #
+      # @api private
+      #
+      # TODO: Add an option or be clever and only run affected specs.
+      #
+      def filename_pattern
+        'spec/unit/**/*_spec.rb'
+      end
+    end
+  end
+end
diff --git a/lib/mutant/runner/rspec.rb b/lib/mutant/runner/rspec.rb
deleted file mode 100644
index 4b375001..00000000
--- a/lib/mutant/runner/rspec.rb
+++ /dev/null
@@ -1,69 +0,0 @@
-module Mutant
-  class Runner
-    # Simple runner for rspec tests
-    class Rspec < self
-
-      # Return error stream
-      #
-      # @return [StringIO]
-      #
-      # @api private
-      #
-      def error_stream
-        StringIO.new
-      end
-
-      # Return output stream
-      #
-      # @return [StringIO]
-      #
-      # @api private
-      #
-      def output_stream
-        StringIO.new
-      end
-
-    private
-
-      # Run rspec test
-      #
-      # @return [true]
-      #   returns true when test is NOT successful and the mutant was killed
-      #
-      # @return [false]
-      #   returns false otherwise
-      #
-      # @api private
-      #
-      def run
-        !RSpec::Core::Runner.run(command_line,error_stream,output_stream).zero?
-      end
-
-      # Return command line
-      #
-      # @return [Array]
-      #
-      # @api private
-      #
-      def command_line
-        %W(
-          --fail-fast
-        ) + Dir[filename_pattern]
-      end
-
-      # Return rspec filename pattern
-      #
-      # @return [String]
-      #
-      # @api private
-      #
-      # TODO: Add an option or be clever and only run affected specs.
-      #
-      def filename_pattern
-        'spec/unit/**/*_spec.rb'
-      end
-
-      memoize :output_stream, :error_stream
-    end
-  end
-end
diff --git a/lib/mutant/subject.rb b/lib/mutant/subject.rb
index d4f62062..dc606697 100644
--- a/lib/mutant/subject.rb
+++ b/lib/mutant/subject.rb
@@ -59,6 +59,20 @@ module Mutant
       self
     end
 
+    # Insert AST node under context
+    #
+    # @param [Rubinius::AST::Node] node
+    #
+    # @return [self]
+    #
+    # @api private
+    #
+    def insert(node)
+      Loader.load(context.root(node))
+
+      self
+    end
+
   private
 
     # Initialize subject
@@ -76,19 +90,5 @@ module Mutant
     def initialize(context, node)
       @context, @node = context, node
     end
-
-    # Insert AST node under context
-    #
-    # @param [Rubinius::AST::Node] node
-    #
-    # @return [self]
-    #
-    # @api private
-    #
-    def insert(node)
-      Loader.load(context.root(node))
-
-      self
-    end
   end
 end
diff --git a/spec/integration/loader_spec.rb b/spec/integration/loader_spec.rb
index ce58f968..95fb45e3 100644
--- a/spec/integration/loader_spec.rb
+++ b/spec/integration/loader_spec.rb
@@ -7,11 +7,11 @@ class CodeLoadingSubject
 end
 
 describe Mutant, 'code loading' do
-  let(:context) { Mutant::Context::Constant.build(CodeLoadingSubject) }
-  let(:node)    { 'def foo; :bar; end'.to_ast                         }
-  let(:root)    { context.root(node)                                  }
-                           
-  subject       { Mutant::Loader.load(root)                           }
+  let(:context) { Mutant::Context::Constant.build("/some/path",CodeLoadingSubject) }
+  let(:node)    { 'def foo; :bar; end'.to_ast                                      }
+  let(:root)    { context.root(node)                                               }
+                                                                           
+  subject       { Mutant::Loader.load(root)                                        }
 
   before { subject }
 
diff --git a/spec/integration/mutant/rspec_killer_spec.rb b/spec/integration/mutant/rspec_killer_spec.rb
new file mode 100644
index 00000000..ba7ddcf7
--- /dev/null
+++ b/spec/integration/mutant/rspec_killer_spec.rb
@@ -0,0 +1,31 @@
+require 'spec_helper'
+
+describe Mutant,'rspec integration' do
+  around do |example|
+    Dir.chdir(TestApp.root) do
+      example.run
+    end
+  end
+
+  specify 'allows to run rspec with mutations' do
+
+    Mutant::Matcher::Method.parse('TestApp::Literal#string').each do |subject|
+      subject.each do |mutation|
+        Mutant::Killer::Rspec.nest do 
+          runner =  Mutant::Killer::Rspec.run(subject,mutation)
+          runner.killed?.should be(true)
+        end
+      end
+    end
+
+    Mutant::Matcher::Method.parse('TestApp::Literal#uncovered_string').each do |subject|
+      subject.each do |mutation|
+        Mutant::Killer::Rspec.nest do 
+          runner =  Mutant::Killer::Rspec.run(subject,mutation)
+          runner.killed?.should be(false)
+        end
+      end
+    end
+
+  end
+end
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index 9edbaaa6..0d387406 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -5,6 +5,9 @@ require 'rspec'
 # require spec support files and shared behavior
 Dir[File.expand_path('../{support,shared}/**/*.rb', __FILE__)].each { |f| require f }
 
+$: << File.join(TestApp.root,'lib')
+require 'test_app'
+
 require 'mutant'
 
 RSpec.configure do |config|
diff --git a/spec/support/test_app.rb b/spec/support/test_app.rb
new file mode 100644
index 00000000..6ab5db3f
--- /dev/null
+++ b/spec/support/test_app.rb
@@ -0,0 +1,5 @@
+module TestApp
+  def self.root
+    File.expand_path('../../../test_app', __FILE__)
+  end
+end
diff --git a/spec/unit/mutant/runner/class_methods/run_spec.rb b/spec/unit/mutant/killer/class_methods/run_spec.rb
similarity index 95%
rename from spec/unit/mutant/runner/class_methods/run_spec.rb
rename to spec/unit/mutant/killer/class_methods/run_spec.rb
index 4948fb42..5756a40f 100644
--- a/spec/unit/mutant/runner/class_methods/run_spec.rb
+++ b/spec/unit/mutant/killer/class_methods/run_spec.rb
@@ -1,6 +1,6 @@
 require 'spec_helper'
 
-describe Mutant::Runner,'.run' do
+describe Mutant::Killer,'.run' do
   subject { class_under_test.run(mutation_subject,mutant) }
 
   let(:mutation_subject) { mock('Subject', :insert => nil, :reset => nil) }
diff --git a/spec/unit/mutant/runner/killed_ques_spec.rb b/spec/unit/mutant/killer/killed_ques_spec.rb
similarity index 95%
rename from spec/unit/mutant/runner/killed_ques_spec.rb
rename to spec/unit/mutant/killer/killed_ques_spec.rb
index dcf381c5..dc7bc95f 100644
--- a/spec/unit/mutant/runner/killed_ques_spec.rb
+++ b/spec/unit/mutant/killer/killed_ques_spec.rb
@@ -1,6 +1,6 @@
 require 'spec_helper'
 
-describe Mutant::Runner,'#killed?' do
+describe Mutant::Killer,'#killed?' do
   subject { object.killed? }
 
   let(:object)           { class_under_test.run(mutation_subject,mutant)  }
diff --git a/spec/unit/mutant/runner/mutant_spec.rb b/spec/unit/mutant/killer/mutant_spec.rb
similarity index 92%
rename from spec/unit/mutant/runner/mutant_spec.rb
rename to spec/unit/mutant/killer/mutant_spec.rb
index a85788a7..fe54fc11 100644
--- a/spec/unit/mutant/runner/mutant_spec.rb
+++ b/spec/unit/mutant/killer/mutant_spec.rb
@@ -1,6 +1,6 @@
 require 'spec_helper'
 
-describe Mutant::Runner,'#mutant' do
+describe Mutant::Killer,'#mutant' do
   subject { object.mutant }
 
   let(:object)           { class_under_test.run(mutation_subject, mutant) }
diff --git a/spec/unit/mutant/runner/rspec/class_methods/run_spec.rb b/spec/unit/mutant/killer/rspec/class_methods/run_spec.rb
similarity index 80%
rename from spec/unit/mutant/runner/rspec/class_methods/run_spec.rb
rename to spec/unit/mutant/killer/rspec/class_methods/run_spec.rb
index 4481b8af..37f999b7 100644
--- a/spec/unit/mutant/runner/rspec/class_methods/run_spec.rb
+++ b/spec/unit/mutant/killer/rspec/class_methods/run_spec.rb
@@ -1,10 +1,10 @@
 require 'spec_helper'
 
-describe Mutant::Runner::Rspec, '.run' do
+describe Mutant::Killer::Rspec, '.run' do
   subject { object.run(context, mutant) }
 
-  let(:context) { mock('Context') }
-  let(:mutant)  { mock('Mutant')  }
+  let(:context)      { mock('Context')      }
+  let(:mutant)       { mock('Mutant')       }
 
   let(:object)  { described_class }
 
diff --git a/spec/unit/mutant/runner/rspec/error_stream_spec.rb b/spec/unit/mutant/killer/rspec/error_stream_spec.rb
similarity index 90%
rename from spec/unit/mutant/runner/rspec/error_stream_spec.rb
rename to spec/unit/mutant/killer/rspec/error_stream_spec.rb
index 534f32b0..c7f7a2b2 100644
--- a/spec/unit/mutant/runner/rspec/error_stream_spec.rb
+++ b/spec/unit/mutant/killer/rspec/error_stream_spec.rb
@@ -1,6 +1,6 @@
 require 'spec_helper'
 
-describe Mutant::Runner::Rspec,'#error_stream' do
+describe Mutant::Killer::Rspec,'#error_stream' do
   subject { object.error_stream }
 
   let(:object)           { described_class.run(mutation_subject,mutant)  }
diff --git a/spec/unit/mutant/runner/rspec/output_stream_spec.rb b/spec/unit/mutant/killer/rspec/output_stream_spec.rb
similarity index 90%
rename from spec/unit/mutant/runner/rspec/output_stream_spec.rb
rename to spec/unit/mutant/killer/rspec/output_stream_spec.rb
index 5ba9a7e9..f1bc0e46 100644
--- a/spec/unit/mutant/runner/rspec/output_stream_spec.rb
+++ b/spec/unit/mutant/killer/rspec/output_stream_spec.rb
@@ -1,6 +1,6 @@
 require 'spec_helper'
 
-describe Mutant::Runner::Rspec,'#output_stream' do
+describe Mutant::Killer::Rspec,'#output_stream' do
   subject { object.output_stream }
 
   let(:object)           { described_class.run(mutation_subject,mutant)  }
diff --git a/spec/unit/mutant/runner/subject_spec.rb b/spec/unit/mutant/killer/subject_spec.rb
similarity index 92%
rename from spec/unit/mutant/runner/subject_spec.rb
rename to spec/unit/mutant/killer/subject_spec.rb
index 0b847db7..ba97646e 100644
--- a/spec/unit/mutant/runner/subject_spec.rb
+++ b/spec/unit/mutant/killer/subject_spec.rb
@@ -1,6 +1,6 @@
 require 'spec_helper'
 
-describe Mutant::Runner,'#subject' do
+describe Mutant::Killer,'#subject' do
   subject { object.subject }
 
   let(:object)           { class_under_test.run(mutation_subject, mutant) }
diff --git a/spec/unit/mutant/matcher/method/each_spec.rb b/spec/unit/mutant/matcher/method/each_spec.rb
index 8b2955f8..950a899a 100644
--- a/spec/unit/mutant/matcher/method/each_spec.rb
+++ b/spec/unit/mutant/matcher/method/each_spec.rb
@@ -10,6 +10,10 @@ describe Mutant::Matcher::Method, '#each' do
         node
       end
 
+      define_method(:method) do
+        TestApp::Literal.instance_method(:string)
+      end
+
       define_method(:constant) do
         ::SampleSubjects::ExampleModule
       end
diff --git a/test_app/lib/test_app/literal.rb b/test_app/lib/test_app/literal.rb
index d7553efb..ca2c6883 100644
--- a/test_app/lib/test_app/literal.rb
+++ b/test_app/lib/test_app/literal.rb
@@ -5,10 +5,22 @@ module TestApp
       true
     end
 
+    def self.freeze
+      raise
+    end
+
     def string
       'string'
     end
 
+    def uncovered_string
+      'string'
+    end
+
+    def self.string
+      'string'
+    end
+
     def symbol
       :symbol
     end
diff --git a/test_app/spec/spec_helper.rb b/test_app/spec/spec_helper.rb
index 2f56c510..870045ac 100644
--- a/test_app/spec/spec_helper.rb
+++ b/test_app/spec/spec_helper.rb
@@ -1,7 +1,6 @@
 # encoding: utf-8
 
 require 'rspec'
-
 require 'test_app'
 
 # require spec support files and shared behavior