Add a sample application to mutate in integration tests

.gitignore

@@ -2,3 +2,4 @@
 /Gemfile.lock
 /tmp
 /coverage
+/test_app/.rbx

test_app/.rspec

@@ -0,0 +1 @@
+--color

test_app/lib/test_app.rb

@@ -0,0 +1,5 @@
+# Namespace for test application
+module TestApp
+end
+
+require 'test_app/literal'

test_app/lib/test_app/literal.rb

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+module TestApp
+  # Class for integration testing literal mutations
+  class Literal
+    def boolean
+      true
+    end
+
+    def string
+      'string'
+    end
+
+    def symbol
+      :symbol
+    end
+
+    def float
+      2.4
+    end
+  end
+end

test_app/spec/spec_helper.rb

@@ -0,0 +1,8 @@
+# encoding: utf-8
+
+require 'rspec'
+
+require 'test_app'
+
+# require spec support files and shared behavior
+Dir[File.expand_path('../{support,shared}/**/*.rb', __FILE__)].each { |f| require f }

test_app/spec/unit/test_app/literal/string_spec.rb

@@ -0,0 +1,9 @@
+require 'spec_helper'
+
+describe TestApp::Literal,'#string' do
+  subject { object.string }
+
+  let(:object) { described_class.new }
+
+  it { should eql('string') }
+end