Add explicit mutator for dsym

lib/mutant.rb

@@ -65,6 +65,7 @@ require 'mutant/mutator/node/begin'
 require 'mutant/mutator/node/connective/binary'
 require 'mutant/mutator/node/const'
 require 'mutant/mutator/node/dstr'
+require 'mutant/mutator/node/dsym'
 require 'mutant/mutator/node/named_value/access'
 require 'mutant/mutator/node/named_value/constant_assignment'
 require 'mutant/mutator/node/named_value/variable_assignment'

lib/mutant/mutator/node/dsym.rb

@@ -0,0 +1,28 @@
+# encoding: utf-8
+
+module Mutant
+  class Mutator
+    class Node
+
+      # Dsym mutator
+      class Dsym < Generic
+
+        handle(:dsym)
+
+      private
+
+        # Emit mutations
+        #
+        # @return [undefined]
+        #
+        # @api private
+        #
+        def dispatch
+          super
+          emit_nil
+        end
+
+      end # Dsym
+    end # Node
+  end # Mutator
+end # Mutant

lib/mutant/mutator/node/generic.rb

@@ -11,7 +11,7 @@ module Mutant
         # your contribution is that close!
         handle(
           :next, :break, :ensure,
-          :dsym, :yield, :rescue, :redo, :defined?,
+          :yield, :rescue, :redo, :defined?,
           :blockarg,
           :regopt, :resbody, :retry, :arg_expr,
           :kwrestarg, :kwoptarg, :kwarg, :undef, :module, :empty,

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

@@ -2,7 +2,7 @@
 
 require 'spec_helper'
 
-describe Mutant::Mutator::Node::Generic, 'dsum' do
+describe Mutant::Mutator::Node::Dsym, 'dsym' do
   before do
     Mutant::Random.stub(:hex_string => 'random')
   end
@@ -16,6 +16,7 @@ describe Mutant::Mutator::Node::Generic, 'dsum' do
     mutations << ':"foo#{bar}random"'
     mutations << ':"foo#{bar}#{nil}"'
     mutations << ':"foo#{nil}baz"'
+    mutations << 'nil'
   end
 
   it_should_behave_like 'a mutator'