Add Kernel#send => Kernel#public_send mutation

Closes #78

lib/mutant/mutator/node/send.rb

@@ -98,11 +98,24 @@ module Mutant
         #
         def normal_dispatch
           emit_naked_receiver
+          emit_selector_mutations
           mutate_receiver
           emit_argument_propagation
           mutate_arguments
         end
 
+        # Emit selector mutations
+        #
+        # @return [undefined]
+        #
+        # @api private
+        #
+        def emit_selector_mutations
+          if selector == :send
+            emit_selector(:public_send)
+          end
+        end
+
         # Emit naked receiver mutation
         #
         # @return [undefined]

spec/unit/mutant/mutator/node/send/mutation_spec.rb

@@ -5,6 +5,20 @@ require 'spec_helper'
 # FIXME: This spec needs to be structured better!
 describe Mutant::Mutator, 'send' do
 
+  context 'when using Kernel#send' do
+    let(:source) { 'foo.send(bar)' }
+
+    let(:mutations) do
+      mutations = []
+      mutations << 'foo.send'
+      mutations << 'foo.public_send(bar)'
+      mutations << 'bar'
+      mutations << 'foo'
+    end
+
+    it_should_behave_like 'a mutator'
+  end
+
   context 'inside op assign' do
     let(:source) { 'self.foo ||= expression' }