Load spec_helper.rb for rspec strategies

lib/mutant/strategy/rspec.rb

@@ -6,6 +6,17 @@ class Rspec < self
 
       KILLER = Killer::Forking.new(Killer::Rspec)
 
+      # Setup rspec strategy
+      #
+      # @return [self]
+      #
+      # @api private
+      #
+      def setup
+        require('./spec/spec_helper.rb')
+        self
+      end
+
       # Run all unit specs per mutation
       class Unit < self
 

spec/integration/mutant/rspec_killer_spec.rb

@@ -11,14 +11,14 @@
   let(:strategy) { Mutant::Strategy::Rspec::DM2 }
 
   specify 'allows to kill mutations' do
-    Kernel.system("bundle exec mutant -I lib -r test_app --rspec-dm2 ::TestApp::Literal#string").should be(true)
+    Kernel.system('bundle exec mutant --rspec-dm2 ::TestApp::Literal#string').should be(true)
   end
 
   specify 'fails to kill mutations when they are not covered' do
-    Kernel.system("bundle exec mutant -I lib -r test_app --rspec-dm2 ::TestApp::Literal#uncovered_string").should be(false)
+    Kernel.system('bundle exec mutant --rspec-dm2 ::TestApp::Literal#uncovered_string').should be(false)
   end
 
   specify 'fails when some mutations when are not covered' do
-    Kernel.system("bundle exec mutant -I lib -r test_app --rspec-dm2 ::TestApp::Literal").should be(false)
+    Kernel.system('bundle exec mutant --rspec-dm2 ::TestApp::Literal').should be(false)
   end
 end

test_app/spec/spec_helper.rb

@@ -1,6 +1,9 @@
 # encoding: utf-8
 
 require 'rspec'
+
+$: << File.join(File.dirname(__FILE__), 'lib')
+
 require 'test_app'
 
 # require spec support files and shared behavior